diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d01ea1..7139ca4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,23 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [1.0.4](https://github.com/NickDJM/accessible-menu-bootstrap-4/compare/v1.0.3...v1.0.4) (2023-06-30)
+
+
+### Continuous Integration
+
+* **codeql:** upgrade to v2 ([463bfa3](https://github.com/NickDJM/accessible-menu-bootstrap-4/commit/463bfa398ba1ed125312f4bc699e4a021f5ce0b7)), closes [#56](https://github.com/NickDJM/accessible-menu-bootstrap-4/issues/56)
+
+
+### Build System
+
+* bump eslint-plugin-jsdoc from 40.3.0 to 43.0.0 ([9d77f09](https://github.com/NickDJM/accessible-menu-bootstrap-4/commit/9d77f098502fe814c5635b1add8b6e50c3254e1b))
+* bump eslint-plugin-jsdoc from 43.2.0 to 44.2.4 ([fa5e7b2](https://github.com/NickDJM/accessible-menu-bootstrap-4/commit/fa5e7b2f453bc27b82a82d0a1e3fb88d136d91db))
+* bump eslint-plugin-jsdoc from 44.2.7 to 46.2.6 ([e1f6b50](https://github.com/NickDJM/accessible-menu-bootstrap-4/commit/e1f6b504f0223e6d11298bc34765fa55e64699e0))
+* bump jest-extended from 3.2.4 to 4.0.0 ([51a1375](https://github.com/NickDJM/accessible-menu-bootstrap-4/commit/51a13754bd17dbfd3824f706083d6bfc1d68e062))
+* **npm:** require at least accessible-menu v3.0.7 ([5e13166](https://github.com/NickDJM/accessible-menu-bootstrap-4/commit/5e13166182f1e70518a2f8418682828dce17d127))
+* **npm:** update all dependencies to latest ([4394ff8](https://github.com/NickDJM/accessible-menu-bootstrap-4/commit/4394ff8bdb55264acb9a9e035f78d4cd43c6dfa0))
+
 ### [1.0.3](https://github.com/NickDJM/accessible-menu-bootstrap-4/compare/v1.0.2...v1.0.3) (2023-02-17)
 
 
diff --git a/README.md b/README.md
index 29dd713..f745587 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ For learning/prototyping purposes you can use the latest version with:
 For production environments, it is recommend to use a specific version to avoid unforseen breaking changes:
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.3/dist/accessible-menu-bs4.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.4/dist/accessible-menu-bs4.min.js"></script>
 ```
 
 ## Usage
@@ -75,7 +75,7 @@ import AccessibleMenu from "accessible-menu-bootstrap-4";
 or
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.3/dist/accessible-menu-bs4.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.4/dist/accessible-menu-bs4.min.js"></script>
 ```
 
 Once you have **accessible-menu-bootstrap-4** loaded, declare a new menu object.
@@ -103,7 +103,7 @@ import { Bootstrap4DisclosureMenu } from "accessible-menu-bootstrap-4";
 or
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.3/dist/disclosure-menu-bs4.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.4/dist/disclosure-menu-bs4.min.js"></script>
 ```
 
 then
@@ -123,7 +123,7 @@ import { Bootstrap4Menubar } from "accessible-menu-bootstrap-4";
 or
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.3/dist/menubar-bs4.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.4/dist/menubar-bs4.min.js"></script>
 ```
 
 then
@@ -143,7 +143,7 @@ import { Bootstrap4Treeview } from "accessible-menu-bootstrap-4";
 or
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.3/dist/treeview-bs4.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/accessible-menu-bootstrap-4@1.0.4/dist/treeview-bs4.min.js"></script>
 ```
 
 then
diff --git a/dist/accessible-menu-bs4.js b/dist/accessible-menu-bs4.js
index b341cb8..bd4e803 100644
--- a/dist/accessible-menu-bs4.js
+++ b/dist/accessible-menu-bs4.js
@@ -158,10 +158,28 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$b(obj, key, value) { key = _toPropertyKey$b(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$b(arg) { var key = _toPrimitive$b(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$b(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenuToggle {
+    _dom = {
+      toggle: null,
+      parent: null
+    };
+    _elements = {
+      controlledMenu: null,
+      parentMenu: null
+    };
+    _open = false;
+    _expandEvent = new CustomEvent("accessibleMenuExpand", {
+      bubbles: true,
+      detail: {
+        toggle: this
+      }
+    });
+    _collapseEvent = new CustomEvent("accessibleMenuCollapse", {
+      bubbles: true,
+      detail: {
+        toggle: this
+      }
+    });
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -169,27 +187,6 @@ var AccessibleMenuBootstrap4 = (function () {
         controlledMenu,
         parentMenu = null
       } = _ref;
-      _defineProperty$b(this, "_dom", {
-        toggle: null,
-        parent: null
-      });
-      _defineProperty$b(this, "_elements", {
-        controlledMenu: null,
-        parentMenu: null
-      });
-      _defineProperty$b(this, "_open", false);
-      _defineProperty$b(this, "_expandEvent", new CustomEvent("accessibleMenuExpand", {
-        bubbles: true,
-        detail: {
-          toggle: this
-        }
-      }));
-      _defineProperty$b(this, "_collapseEvent", new CustomEvent("accessibleMenuCollapse", {
-        bubbles: true,
-        detail: {
-          toggle: this
-        }
-      }));
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._elements.controlledMenu = controlledMenu;
@@ -334,10 +331,17 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$a(obj, key, value) { key = _toPropertyKey$a(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$a(arg) { var key = _toPrimitive$a(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$a(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenuItem {
+    _dom = {
+      item: null,
+      link: null
+    };
+    _elements = {
+      parentMenu: null,
+      childMenu: null,
+      toggle: null
+    };
+    _submenu = false;
     constructor(_ref) {
       let {
         menuItemElement,
@@ -347,16 +351,6 @@ var AccessibleMenuBootstrap4 = (function () {
         childMenu = null,
         toggle = null
       } = _ref;
-      _defineProperty$a(this, "_dom", {
-        item: null,
-        link: null
-      });
-      _defineProperty$a(this, "_elements", {
-        parentMenu: null,
-        childMenu: null,
-        toggle: null
-      });
-      _defineProperty$a(this, "_submenu", false);
       this._dom.item = menuItemElement;
       this._dom.link = menuLinkElement;
       this._elements.parentMenu = parentMenu;
@@ -413,10 +407,41 @@ var AccessibleMenuBootstrap4 = (function () {
     event.stopPropagation();
   }
 
-  function _defineProperty$9(obj, key, value) { key = _toPropertyKey$9(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$9(arg) { var key = _toPrimitive$9(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$9(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenu {
+    _MenuType = BaseMenu;
+    _MenuItemType = BaseMenuItem;
+    _MenuToggleType = BaseMenuToggle;
+    _dom = {
+      menu: null,
+      menuItems: [],
+      submenuItems: [],
+      submenuToggles: [],
+      submenus: [],
+      controller: null,
+      container: null
+    };
+    _selectors = {
+      menuItems: "",
+      menuLinks: "",
+      submenuItems: "",
+      submenuToggles: "",
+      submenus: ""
+    };
+    _elements = {
+      menuItems: [],
+      submenuToggles: [],
+      controller: null,
+      parentMenu: null,
+      rootMenu: null
+    };
+    _openClass = "show";
+    _closeClass = "hide";
+    _root = true;
+    _currentChild = 0;
+    _focusState = "none";
+    _currentEvent = "none";
+    _hoverType = "off";
+    _hoverDelay = 250;
     constructor(_ref) {
       let {
         menuElement,
@@ -434,40 +459,6 @@ var AccessibleMenuBootstrap4 = (function () {
         hoverType = "off",
         hoverDelay = 250
       } = _ref;
-      _defineProperty$9(this, "_MenuType", BaseMenu);
-      _defineProperty$9(this, "_MenuItemType", BaseMenuItem);
-      _defineProperty$9(this, "_MenuToggleType", BaseMenuToggle);
-      _defineProperty$9(this, "_dom", {
-        menu: null,
-        menuItems: [],
-        submenuItems: [],
-        submenuToggles: [],
-        submenus: [],
-        controller: null,
-        container: null
-      });
-      _defineProperty$9(this, "_selectors", {
-        menuItems: "",
-        menuLinks: "",
-        submenuItems: "",
-        submenuToggles: "",
-        submenus: ""
-      });
-      _defineProperty$9(this, "_elements", {
-        menuItems: [],
-        submenuToggles: [],
-        controller: null,
-        parentMenu: null,
-        rootMenu: null
-      });
-      _defineProperty$9(this, "_openClass", "show");
-      _defineProperty$9(this, "_closeClass", "hide");
-      _defineProperty$9(this, "_root", true);
-      _defineProperty$9(this, "_currentChild", 0);
-      _defineProperty$9(this, "_focusState", "none");
-      _defineProperty$9(this, "_currentEvent", "none");
-      _defineProperty$9(this, "_hoverType", "off");
-      _defineProperty$9(this, "_hoverDelay", 250);
       this._dom.menu = menuElement;
       this._dom.controller = controllerElement;
       this._dom.container = containerElement;
@@ -920,8 +911,10 @@ var AccessibleMenuBootstrap4 = (function () {
           const key = keyPress(event);
           if (key === "Space" || key === "Enter") {
             preventEvent(event);
-            this.elements.controller.open();
-            this.focusFirstChild();
+            this.elements.controller.toggle();
+            if (this.elements.controller.isOpen) {
+              this.focusFirstChild();
+            }
           }
         });
       }
@@ -1064,10 +1057,12 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$8(obj, key, value) { key = _toPropertyKey$8(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$8(arg) { var key = _toPrimitive$8(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$8(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class DisclosureMenu extends BaseMenu {
+    _MenuType = DisclosureMenu;
+    _MenuItemType = DisclosureMenuItem;
+    _MenuToggleType = DisclosureMenuToggle;
+    _currentChild = -1;
+    _optionalSupport = false;
     constructor(_ref) {
       let {
         menuElement,
@@ -1103,11 +1098,6 @@ var AccessibleMenuBootstrap4 = (function () {
         hoverType,
         hoverDelay
       });
-      _defineProperty$8(this, "_MenuType", DisclosureMenu);
-      _defineProperty$8(this, "_MenuItemType", DisclosureMenuItem);
-      _defineProperty$8(this, "_MenuToggleType", DisclosureMenuToggle);
-      _defineProperty$8(this, "_currentChild", -1);
-      _defineProperty$8(this, "_optionalSupport", false);
       this._optionalSupport = optionalKeySupport;
       if (initialize) {
         this.initialize();
@@ -1264,10 +1254,12 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$7(obj, key, value) { key = _toPropertyKey$7(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$7(arg) { var key = _toPrimitive$7(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$7(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {
+    _dom = {
+      toggle: null,
+      parent: null,
+      container: null
+    };
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -1283,11 +1275,6 @@ var AccessibleMenuBootstrap4 = (function () {
         parentMenu,
         initialize: false
       });
-      _defineProperty$7(this, "_dom", {
-        toggle: null,
-        parent: null,
-        container: null
-      });
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._dom.container = controlledMenu.isTopLevel ? controlledMenu.dom.container : controlledMenu.dom.menu;
@@ -1348,10 +1335,10 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$6(obj, key, value) { key = _toPropertyKey$6(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$6(arg) { var key = _toPrimitive$6(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$6(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4DisclosureMenu extends DisclosureMenu {
+    _MenuType = Bootstrap4DisclosureMenu;
+    _MenuItemType = Bootstrap4DisclosureMenuItem;
+    _MenuToggleType = Bootstrap4DisclosureMenuToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -1389,9 +1376,6 @@ var AccessibleMenuBootstrap4 = (function () {
         optionalKeySupport,
         initialize: false
       });
-      _defineProperty$6(this, "_MenuType", Bootstrap4DisclosureMenu);
-      _defineProperty$6(this, "_MenuItemType", Bootstrap4DisclosureMenuItem);
-      _defineProperty$6(this, "_MenuToggleType", Bootstrap4DisclosureMenuToggle);
       if (initialize) {
         this.initialize();
       }
@@ -1476,10 +1460,10 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$5(obj, key, value) { key = _toPropertyKey$5(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$5(arg) { var key = _toPrimitive$5(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$5(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Menubar extends BaseMenu {
+    _MenuType = Menubar;
+    _MenuItemType = MenubarItem;
+    _MenuToggleType = MenubarToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -1514,9 +1498,6 @@ var AccessibleMenuBootstrap4 = (function () {
         hoverType,
         hoverDelay
       });
-      _defineProperty$5(this, "_MenuType", Menubar);
-      _defineProperty$5(this, "_MenuItemType", MenubarItem);
-      _defineProperty$5(this, "_MenuToggleType", MenubarToggle);
       if (initialize) {
         this.initialize();
       }
@@ -1524,7 +1505,11 @@ var AccessibleMenuBootstrap4 = (function () {
     initialize() {
       try {
         super.initialize();
-        this.dom.menu.setAttribute("role", "menubar");
+        if (this.isTopLevel) {
+          this.dom.menu.setAttribute("role", "menubar");
+        } else {
+          this.dom.menu.setAttribute("role", "menu");
+        }
         this._handleFocus();
         this._handleClick();
         this._handleHover();
@@ -1802,10 +1787,12 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$4(obj, key, value) { key = _toPropertyKey$4(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$4(arg) { var key = _toPrimitive$4(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$4(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4MenubarToggle extends MenubarToggle {
+    _dom = {
+      toggle: null,
+      parent: null,
+      container: null
+    };
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -1821,11 +1808,6 @@ var AccessibleMenuBootstrap4 = (function () {
         parentMenu,
         initialize: false
       });
-      _defineProperty$4(this, "_dom", {
-        toggle: null,
-        parent: null,
-        container: null
-      });
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._dom.container = controlledMenu.isTopLevel ? controlledMenu.dom.container : controlledMenu.dom.menu;
@@ -1886,10 +1868,10 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$3(obj, key, value) { key = _toPropertyKey$3(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$3(arg) { var key = _toPrimitive$3(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$3(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4Menubar extends Menubar {
+    _MenuType = Bootstrap4Menubar;
+    _MenuItemType = Bootstrap4MenubarItem;
+    _MenuToggleType = Bootstrap4MenubarToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -1925,9 +1907,6 @@ var AccessibleMenuBootstrap4 = (function () {
         hoverDelay,
         initialize: false
       });
-      _defineProperty$3(this, "_MenuType", Bootstrap4Menubar);
-      _defineProperty$3(this, "_MenuItemType", Bootstrap4MenubarItem);
-      _defineProperty$3(this, "_MenuToggleType", Bootstrap4MenubarToggle);
       if (initialize) {
         this.initialize();
       }
@@ -1994,10 +1973,10 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$2(obj, key, value) { key = _toPropertyKey$2(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$2(arg) { var key = _toPrimitive$2(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$2(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Treeview extends BaseMenu {
+    _MenuType = Treeview;
+    _MenuItemType = TreeviewItem;
+    _MenuToggleType = TreeviewToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -2032,9 +2011,6 @@ var AccessibleMenuBootstrap4 = (function () {
         hoverType,
         hoverDelay
       });
-      _defineProperty$2(this, "_MenuType", Treeview);
-      _defineProperty$2(this, "_MenuItemType", TreeviewItem);
-      _defineProperty$2(this, "_MenuToggleType", TreeviewToggle);
       if (initialize) {
         this.initialize();
       }
@@ -2273,10 +2249,12 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty$1(obj, key, value) { key = _toPropertyKey$1(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$1(arg) { var key = _toPrimitive$1(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$1(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4TreeviewToggle extends TreeviewToggle {
+    _dom = {
+      toggle: null,
+      parent: null,
+      container: null
+    };
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -2292,11 +2270,6 @@ var AccessibleMenuBootstrap4 = (function () {
         parentMenu,
         initialize: false
       });
-      _defineProperty$1(this, "_dom", {
-        toggle: null,
-        parent: null,
-        container: null
-      });
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._dom.container = controlledMenu.isTopLevel ? controlledMenu.dom.container : controlledMenu.dom.menu;
@@ -2357,10 +2330,10 @@ var AccessibleMenuBootstrap4 = (function () {
     }
   }
 
-  function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4Treeview extends Treeview {
+    _MenuType = Bootstrap4Treeview;
+    _MenuItemType = Bootstrap4TreeviewItem;
+    _MenuToggleType = Bootstrap4TreeviewToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -2396,9 +2369,6 @@ var AccessibleMenuBootstrap4 = (function () {
         hoverDelay,
         initialize: false
       });
-      _defineProperty(this, "_MenuType", Bootstrap4Treeview);
-      _defineProperty(this, "_MenuItemType", Bootstrap4TreeviewItem);
-      _defineProperty(this, "_MenuToggleType", Bootstrap4TreeviewToggle);
       if (initialize) {
         this.initialize();
       }
diff --git a/dist/accessible-menu-bs4.js.map b/dist/accessible-menu-bs4.js.map
index e7b54d8..a1cea46 100644
--- a/dist/accessible-menu-bs4.js.map
+++ b/dist/accessible-menu-bs4.js.map
@@ -1 +1 @@
-{"version":3,"file":"accessible-menu-bs4.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/disclosureMenuItem.js","../node_modules/accessible-menu/src/disclosureMenuToggle.js","../node_modules/accessible-menu/src/disclosureMenu.js","../src/bootstrap4DisclosureMenuItem.js","../src/bootstrap4DisclosureMenuToggle.js","../src/bootstrap4DisclosureMenu.js","../node_modules/accessible-menu/src/menubarItem.js","../node_modules/accessible-menu/src/menubarToggle.js","../node_modules/accessible-menu/src/menubar.js","../src/bootstrap4MenubarItem.js","../src/bootstrap4MenubarToggle.js","../src/bootstrap4Menubar.js","../node_modules/accessible-menu/src/treeviewItem.js","../node_modules/accessible-menu/src/treeviewToggle.js","../node_modules/accessible-menu/src/treeview.js","../src/bootstrap4TreeviewItem.js","../src/bootstrap4TreeviewToggle.js","../src/bootstrap4Treeview.js","../rollup.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this.dom.menu.setAttribute(\"role\", \"menubar\");\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4Menubar;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                    [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                    [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                    [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}        [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}        [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}    [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}    [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                   [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Treeview|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                    [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                    [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                   [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      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The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. 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The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, DisclosureMenuToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link DisclosureMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu Bootstrap4DisclosureMenuToggle */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   *\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   *\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   *\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar, MenubarToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      // Set the role of the menu.\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"menubar\");\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"menu\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar Bootstrap4MenubarToggle */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4Menubar;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview, TreeviewToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview Bootstrap4TreeviewToggle */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   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[options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                    [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}        [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}        [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}    [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}    [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                   [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Treeview|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                    [options.hoverType = off]         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submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4Treeview;\n","import Bootstrap4DisclosureMenu from \"./src/bootstrap4DisclosureMenu.js\";\nimport Bootstrap4Menubar from \"./src/bootstrap4Menubar.js\";\nimport Bootstrap4Treeview from \"./src/bootstrap4Treeview.js\";\n\nexport default {\n  Bootstrap4DisclosureMenu,\n  Bootstrap4Menubar,\n  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diff --git a/dist/accessible-menu-bs4.min.js b/dist/accessible-menu-bs4.min.js
index 2c67939..d3c12e8 100644
--- a/dist/accessible-menu-bs4.min.js
+++ b/dist/accessible-menu-bs4.min.js
@@ -1,2 +1,2 @@
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t=this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\s]/g,""),n=e;!t.replace(/\s/g,"").length&&this.dom.toggle.getAttribute("aria-label")&&(t=this.dom.toggle.getAttribute("aria-label").replace(/[^a-zA-Z0-9\s]/g,"")),t.replace(/\s/g,"").length>0&&(t=t.toLowerCase().replace(/\s+/g,"-"),t.startsWith("-")&&(t=t.substring(1)),t.endsWith("-")&&(t=t.slice(0,-1)),n=`${t}-${n}`),this.dom.toggle.id=this.dom.toggle.id||`${n}-menu-button`,this.elements.controlledMenu.dom.menu.id=this.elements.controlledMenu.dom.menu.id||`${n}-menu`}this.elements.controlledMenu.dom.menu.setAttribute("aria-labelledby",this.dom.toggle.id),this.dom.toggle.setAttribute("aria-controls",this.elements.controlledMenu.dom.menu.id),this._collapse(!1)}get dom(){return this._dom}get elements(){return this._elements}get isOpen(){return this._open}set isOpen(e){t("boolean",{value:e}),this._open=e}_expand(){let e=!(arguments.length>0&&void 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t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function h(e){e.preventDefault(),e.stopPropagation()}function c(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:i="",submenuToggleSelector:r="a",submenuSelector:o="ul",controllerElement:m=null,containerElement:h=null,openClass:d="show",closeClass:p="hide",isTopLevel:g=!0,parentMenu:f=null,hoverType:b="off",hoverDelay:v=250}=e;c(this,"_MenuType",a),c(this,"_MenuItemType",u),c(this,"_MenuToggleType",l),c(this,"_dom",{menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null}),c(this,"_selectors",{menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""}),c(this,"_elements",{menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null}),c(this,"_openClass","show"),c(this,"_closeClass","hide"),c(this,"_root",!0),c(this,"_currentChild",0),c(this,"_focusState","none"),c(this,"_currentEvent","none"),c(this,"_hoverType","off"),c(this,"_hoverDelay",250),this._dom.menu=t,this._dom.controller=m,this._dom.container=h,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=i,this._selectors.submenuToggles=r,this._selectors.submenus=o,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=f,this._elements.rootMenu=g?this:null,this._openClass=d||"",this._closeClass=p||"",this._root=g,this._hoverType=b,this._hoverDelay=v}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){i({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let r=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(r=!1):e(HTMLElement,{menuElement:this._dom.menu})||(r=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(r=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(r=!1),""===this._openClass||s({openClass:this._openClass})||(r=!1),""===this._closeClass||s({closeClass:this._closeClass})||(r=!1),t("boolean",{isTopLevel:this._root})||(r=!1),null===this._elements.parentMenu||e(a,{parentMenu:this._elements.parentMenu})||(r=!1),i({hoverType:this._hoverType})||(r=!1),t("number",{hoverDelay:this._hoverDelay})||(r=!1),r}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const i=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?i:[...this._dom[t],...i]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),i=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),r=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:i,parentMenu:this});this._elements.submenuToggles.push(r),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:i,toggle:r})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){h(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||h(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||(h(e),this.elements.controller.open(),this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class d extends u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:l=null,initialize:o=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:l}),o&&this.initialize()}}class p extends l{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i}),r&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}function g(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class f extends a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:i="",submenuToggleSelector:r="a",submenuSelector:l="ul",controllerElement:o=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:b="off",hoverDelay:v=250,optionalKeySupport:M=!1,initialize:y=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:l,controllerElement:o,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:b,hoverDelay:v}),g(this,"_MenuType",f),g(this,"_MenuItemType",d),g(this,"_MenuToggleType",p),g(this,"_currentChild",-1),g(this,"_optionalSupport",!1),this._optionalSupport=M,y&&this.initialize()}initialize(){try{super.initialize(),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}get optionalKeySupport(){return this.isTopLevel?this._optionalSupport:this.elements.rootMenu.optionalKeySupport}set optionalKeySupport(e){t("boolean",{optionalKeySupport:e}),this._optionalSupport=e}_validate(){let e=super._validate();return t("boolean",{optionalKeySupport:this._optionalSupport})||(e=!1),e}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);if("self"===this.focusState){const n=["Space","Enter"],s=["Escape"],i=["Escape"];if(this.optionalKeySupport){["ArrowUp","ArrowRight","ArrowDown","ArrowLeft","Home","End"].includes(t)&&h(e)}else(this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t)||this.elements.parentMenu&&i.includes(t))&&h(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview()):this.currentMenuItem.dom.link.click();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(h(e),this.closeChildren()):this.elements.parentMenu?(h(e),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.closeChildren(),this.elements.parentMenu.focusCurrentChild()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController())}else this.optionalKeySupport&&("ArrowDown"===t||"ArrowRight"===t?(h(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.childMenu.focusFirstChild()):this.focusNextChild()):"ArrowUp"===t||"ArrowLeft"===t?(h(e),this.focusPreviousChild()):"Home"===t?(h(e),this.focusFirstChild()):"End"===t&&(h(e),this.focusLastChild()))}))}}class b extends d{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:l=null,initialize:o=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:l,initialize:!1}),o&&this.initialize()}}function v(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class M extends p{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i,initialize:!1}),v(this,"_dom",{toggle:null,parent:null,container:null}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,r&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}function y(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class E extends f{constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:i=".dropdown",submenuToggleSelector:r=".dropdown-toggle",submenuSelector:l=".dropdown-menu",controllerElement:o=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,optionalKeySupport:g=!1,initialize:f=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:l,controllerElement:o,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,optionalKeySupport:g,initialize:!1}),y(this,"_MenuType",E),y(this,"_MenuItemType",b),y(this,"_MenuToggleType",M),f&&this.initialize()}}class C extends u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:l=null,initialize:o=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:l}),o&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","menuitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=0)}blur(){super.blur(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=-1)}}class I extends l{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i}),r&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}function S(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class _ extends a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:i="",submenuToggleSelector:r="a",submenuSelector:l="ul",controllerElement:o=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:l,controllerElement:o,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),S(this,"_MenuType",_),S(this,"_MenuItemType",C),S(this,"_MenuToggleType",I),g&&this.initialize()}initialize(){try{super.initialize(),this.dom.menu.setAttribute("role","menubar"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup(),this.isTopLevel&&(this.elements.menuItems[0].dom.link.tabIndex=0)}catch(e){console.error(e)}}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?(this.elements.rootMenu.blur(),this.elements.rootMenu.closeChildren()):this.elements.rootMenu.focus()),"Character"===t)h(e);else if(this.isTopLevel){if("self"===this.focusState){const n=["Space","Enter","ArrowDown","ArrowUp"],s=["Escape"];(["ArrowRight","ArrowLeft","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&h(e)}}else{const n=["Space","Enter"];(["Escape","ArrowRight","ArrowLeft","ArrowDown","ArrowUp","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t))&&h(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e),{altKey:n,crtlKey:s,metaKey:i}=e;if("Character"!==t||(n||s||i))if(this.isTopLevel){if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click();else if("ArrowRight"===t){h(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusNextChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowLeft"===t){h(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusPreviousChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowDown"===t)this.currentMenuItem.isSubmenuItem&&(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()})));else if("ArrowUp"===t)this.currentMenuItem.isSubmenuItem&&(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusLastChild()})));else if("Home"===t)h(e),this.focusFirstChild();else if("End"===t)h(e),this.focusLastChild();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(h(e),this.closeChildren()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(h(e),this.elements.controller.close(),this.focusController())}}else"Space"===t||"Enter"===t?this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click():"Escape"===t?(h(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusCurrentChild()):"ArrowRight"===t?this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):(h(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusNextChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&this.elements.rootMenu.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?this.elements.parentMenu.currentMenuItem.isSubmenuItem&&(h(e),this.elements.parentMenu.currentMenuItem.elements.toggle.close(),this.elements.parentMenu.focusCurrentChild(),this.elements.parentMenu===this.elements.rootMenu&&(this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusPreviousChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&(this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.elements.rootMenu.currentMenuItem.elements.toggle.preview()))):"ArrowDown"===t?(h(e),this.focusNextChild()):"ArrowUp"===t?(h(e),this.focusPreviousChild()):"Home"===t?(h(e),this.focusFirstChild()):"End"===t&&(h(e),this.focusLastChild());else h(e),this.elements.rootMenu.currentEvent="character",this.focusNextChildWithCharacter(e.key)}))}focusNextChild(){this.currentChild===this.elements.menuItems.length-1?this.focusFirstChild():this.focusChild(this.currentChild+1)}focusPreviousChild(){0===this.currentChild?this.focusLastChild():this.focusChild(this.currentChild-1)}focusNextChildWithCharacter(e){const t=e.toLowerCase();let n=this.currentChild+1,s=!1;for(;!s&&n<this.elements.menuItems.length;){let e="";e=this.elements.menuItems[n].dom.item.innerText?this.elements.menuItems[n].dom.item.innerText:this.elements.menuItems[n].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t&&(s=!0,this.focusChild(n)),n++}}}class T extends C{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:l=null,initialize:o=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:l,initialize:!1}),o&&this.initialize()}}function w(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class L extends I{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i,initialize:!1}),w(this,"_dom",{toggle:null,parent:null,container:null}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,r&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}function A(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class k extends _{constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:i=".dropdown",submenuToggleSelector:r=".dropdown-toggle",submenuSelector:l=".dropdown-menu",controllerElement:o=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:l,controllerElement:o,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),A(this,"_MenuType",k),A(this,"_MenuItemType",T),A(this,"_MenuToggleType",L),g&&this.initialize()}}class x extends u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:l=null,initialize:o=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:l}),o&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","treeitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.dom.link.tabIndex=0}blur(){super.blur(),this.dom.link.tabIndex=-1}}class z extends l{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i}),r&&this.initialize()}}function O(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class j extends a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:i="",submenuToggleSelector:r="a",submenuSelector:l="ul",controllerElement:o=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:l,controllerElement:o,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),O(this,"_MenuType",j),O(this,"_MenuItemType",x),O(this,"_MenuToggleType",z),g&&this.initialize()}initialize(){try{super.initialize(),this.isTopLevel?(this.dom.menu.setAttribute("role","tree"),this.elements.menuItems[0].dom.link.tabIndex=0):this.dom.menu.setAttribute("role","group"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?this.elements.rootMenu.blur():this.elements.rootMenu.focus()),"self"===this.focusState){const n=["Enter","ArrowRight"],s=["Escape"];(["Space","ArrowUp","ArrowDown","ArrowLeft","Asterisk","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&h(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e),{altKey:n,crtlKey:s,metaKey:i}=e;if("Character"!==t||(n||s||i)){if("self"===this.focusState)if("Enter"===t||"Space"===t)h(e),this.currentMenuItem.isSubmenuItem?this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview():this.currentMenuItem.dom.link.click();else if("Escape"===t)this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController());else if("ArrowDown"===t)h(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.isTopLevel||this.currentChild!==this.elements.menuItems.length-1?this.focusNextChild():this.focusParentsNextChild();else if("ArrowUp"===t){h(e);const t=this.elements.menuItems[this.currentChild-1];t&&t.isSubmenuItem&&t.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentChild=this.currentChild-1,this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.focusChildsLastNode()):this.isTopLevel||0!==this.currentChild?this.focusPreviousChild():(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())}else"ArrowRight"===t?this.currentMenuItem.isSubmenuItem&&(h(e),this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?(h(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.toggle.close()):this.isTopLevel||(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())):"Home"===t?(h(e),this.blurCurrentChild(),this.elements.rootMenu.focusFirstChild()):"End"===t?(h(e),this.blurCurrentChild(),this.elements.rootMenu.focusLastNode()):"Asterisk"===t&&(h(e),this.openChildren())}else h(e),this.elements.rootMenu.currentEvent="character",this.focusNextNodeWithCharacter(e.key)}))}focusLastNode(){const e=this.elements.menuItems.length-1,t=this.elements.menuItems[e];t.isSubmenuItem&&t.elements.toggle.isOpen?(this.currentChild=e,t.elements.childMenu.currentEvent=this.currentEvent,t.elements.childMenu.focusLastNode()):this.focusLastChild()}openChildren(){this.elements.submenuToggles.forEach((e=>e.preview()))}focusNextNodeWithCharacter(e){const t=e.toLowerCase(),n=function e(t){let n=[];return t.elements.menuItems.forEach((t=>{n.push(t),t.isSubmenuItem&&t.elements.toggle.isOpen&&(n=[...n,...e(t.elements.toggle.elements.controlledMenu)])})),n}(this.elements.rootMenu),s=n.indexOf(this.currentMenuItem)+1,i=[...n.slice(s),...n.slice(0,s)];let r=0,l=!1;for(;!l&&r<i.length;){let e="";if(e=i[r].dom.item.innerText?i[r].dom.item.innerText:i[r].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t){l=!0;const e=i[r].elements.parentMenu,t=e.elements.menuItems.indexOf(i[r]);this.elements.rootMenu.blurChildren(),e.focusChild(t)}r++}}focusParentsNextChild(){this.elements.parentMenu&&(this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.currentChild===this.elements.parentMenu.elements.menuItems.length-1?(this.elements.parentMenu.blurCurrentChild(),this.elements.parentMenu.focusParentsNextChild()):(this.blurChildren(),this.elements.parentMenu.focusNextChild()))}focusChildsLastNode(){this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusLastChild(),this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle.isOpen&&(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.childMenu.focusChildsLastNode())}}class D extends x{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:l=null,initialize:o=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:l,initialize:!1}),o&&this.initialize()}}function P(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class N extends z{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i,initialize:!1}),P(this,"_dom",{toggle:null,parent:null,container:null}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,r&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}function K(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class $ extends j{constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:i=".dropdown",submenuToggleSelector:r=".dropdown-toggle",submenuSelector:l=".dropdown-menu",controllerElement:o=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:l,controllerElement:o,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),K(this,"_MenuType",$),K(this,"_MenuItemType",D),K(this,"_MenuToggleType",N),g&&this.initialize()}}return{Bootstrap4DisclosureMenu:E,Bootstrap4Menubar:k,Bootstrap4Treeview:$}}();
+var AccessibleMenuBootstrap4=function(){"use strict";function e(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${typeof t} given.`)}for(const n in t)if(!(t[n]instanceof e)){const s=typeof t[n];throw new TypeError(`AccessibleMenu: ${n} must be an instance of ${e.name}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function t(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Values given to isValidType() must be inside of an object. ${typeof t} given.`)}for(const n in t){const s=typeof t[n];if(s!==e)throw new TypeError(`AccessibleMenu: ${n} must be a ${e}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function n(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${typeof e} given.`)}for(const t in e)try{if(null===e[t])throw new Error;document.querySelector(e[t])}catch(n){throw new TypeError(`AccessibleMenu: ${t} must be a valid CSS selector. "${e[t]}" given.`)}return!0}catch(e){return console.error(e),!1}}function s(e){try{if("object"!=typeof e||Array.isArray(e)){throw new TypeError(`AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${typeof e} given.`)}for(const t in e){const s=typeof e[t];if("string"!==s){if(!Array.isArray(e[t]))throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. ${s} given.`);e[t].forEach((e=>{if("string"!=typeof e)throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. An array containing non-strings given.`)}))}else{const s={};s[t]=e[t],n(s)}}return!0}catch(e){return console.error(e),!1}}function l(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${typeof e} given.`)}const t=["off","on","dynamic"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}class i{_dom={toggle:null,parent:null};_elements={controlledMenu:null,parentMenu:null};_open=!1;_expandEvent=new CustomEvent("accessibleMenuExpand",{bubbles:!0,detail:{toggle:this}});_collapseEvent=new CustomEvent("accessibleMenuCollapse",{bubbles:!0,detail:{toggle:this}});constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null}=e;this._dom.toggle=t,this._dom.parent=n,this._elements.controlledMenu=s,this._elements.parentMenu=l}initialize(){if(this.dom.toggle.setAttribute("aria-haspopup","true"),this.dom.toggle.setAttribute("aria-expanded","false"),function(n,s){if(t("string",{tagName:n})&&e(HTMLElement,s)){const e=n.toLowerCase();let t=!0;for(const n in s)s[n].tagName.toLowerCase()!==e&&(t=!1);return t}return!1}("button",{toggle:this.dom.toggle})||this.dom.toggle.setAttribute("role","button"),""===this.dom.toggle.id||""===this.elements.controlledMenu.dom.menu.id){const e=Math.random().toString(36).replace(/[^a-z]+/g,"").substr(0,10);let t=this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\s]/g,""),n=e;!t.replace(/\s/g,"").length&&this.dom.toggle.getAttribute("aria-label")&&(t=this.dom.toggle.getAttribute("aria-label").replace(/[^a-zA-Z0-9\s]/g,"")),t.replace(/\s/g,"").length>0&&(t=t.toLowerCase().replace(/\s+/g,"-"),t.startsWith("-")&&(t=t.substring(1)),t.endsWith("-")&&(t=t.slice(0,-1)),n=`${t}-${n}`),this.dom.toggle.id=this.dom.toggle.id||`${n}-menu-button`,this.elements.controlledMenu.dom.menu.id=this.elements.controlledMenu.dom.menu.id||`${n}-menu`}this.elements.controlledMenu.dom.menu.setAttribute("aria-labelledby",this.dom.toggle.id),this.dom.toggle.setAttribute("aria-controls",this.elements.controlledMenu.dom.menu.id),this._collapse(!1)}get dom(){return this._dom}get elements(){return this._elements}get isOpen(){return this._open}set isOpen(e){t("boolean",{value:e}),this._open=e}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.add(n):this.elements.controlledMenu.dom.menu.classList.add(...n)),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.remove(t):this.elements.controlledMenu.dom.menu.classList.remove(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.add(t):this.elements.controlledMenu.dom.menu.classList.add(...t)),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.remove(n):this.elements.controlledMenu.dom.menu.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}open(){this.elements.controlledMenu.focusState="self",this._expand(),this.isOpen=!0}preview(){this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._expand(),this.isOpen=!0}close(){this.isOpen&&(this.elements.controlledMenu.currentChild=0,this.elements.controlledMenu.blur(),this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._collapse(),this.isOpen=!1)}toggle(){this.isOpen?this.close():this.open()}closeSiblings(){this.elements.parentMenu&&this.elements.parentMenu.elements.submenuToggles.forEach((e=>{e!==this&&e.close()}))}closeChildren(){this.elements.controlledMenu.elements.submenuToggles.forEach((e=>e.close()))}}class o{_dom={item:null,link:null};_elements={parentMenu:null,childMenu:null,toggle:null};_submenu=!1;constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:i=null,toggle:o=null}=e;this._dom.item=t,this._dom.link=n,this._elements.parentMenu=s,this._elements.childMenu=i,this._elements.toggle=o,this._submenu=l}initialize(){}get dom(){return this._dom}get elements(){return this._elements}get isSubmenuItem(){return this._submenu}focus(){this.elements.parentMenu.shouldFocus&&this.dom.link.focus()}blur(){this.elements.parentMenu.shouldFocus&&this.dom.link.blur()}}function r(e){try{const t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function u(e){e.preventDefault(),e.stopPropagation()}class m{_MenuType=m;_MenuItemType=o;_MenuToggleType=i;_dom={menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null};_selectors={menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""};_elements={menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null};_openClass="show";_closeClass="hide";_root=!0;_currentChild=0;_focusState="none";_currentEvent="none";_hoverType="off";_hoverDelay=250;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:l="",submenuToggleSelector:i="a",submenuSelector:o="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250}=e;this._dom.menu=t,this._dom.controller=r,this._dom.container=u,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=l,this._selectors.submenuToggles=i,this._selectors.submenus=o,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=a,this._elements.rootMenu=c?this:null,this._openClass=m||"",this._closeClass=h||"",this._root=c,this._hoverType=d,this._hoverDelay=p}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){l({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let i=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(i=!1):e(HTMLElement,{menuElement:this._dom.menu})||(i=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(i=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(i=!1),""===this._openClass||s({openClass:this._openClass})||(i=!1),""===this._closeClass||s({closeClass:this._closeClass})||(i=!1),t("boolean",{isTopLevel:this._root})||(i=!1),null===this._elements.parentMenu||e(m,{parentMenu:this._elements.parentMenu})||(i=!1),l({hoverType:this._hoverType})||(i=!1),t("number",{hoverDelay:this._hoverDelay})||(i=!1),i}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const l=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?l:[...this._dom[t],...l]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),l=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),i=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:l,parentMenu:this});this._elements.submenuToggles.push(i),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:l,toggle:i})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){u(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||u(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||(u(e),this.elements.controller.toggle(),this.elements.controller.isOpen&&this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class h extends o{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:i=null,toggle:o=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:i,toggle:o}),r&&this.initialize()}}class c extends i{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l}),i&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}class a extends m{_MenuType=a;_MenuItemType=h;_MenuToggleType=c;_currentChild=-1;_optionalSupport=!1;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:l="",submenuToggleSelector:i="a",submenuSelector:o="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,optionalKeySupport:g=!1,initialize:M=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:i,submenuSelector:o,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),this._optionalSupport=g,M&&this.initialize()}initialize(){try{super.initialize(),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}get optionalKeySupport(){return this.isTopLevel?this._optionalSupport:this.elements.rootMenu.optionalKeySupport}set optionalKeySupport(e){t("boolean",{optionalKeySupport:e}),this._optionalSupport=e}_validate(){let e=super._validate();return t("boolean",{optionalKeySupport:this._optionalSupport})||(e=!1),e}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);if("self"===this.focusState){const n=["Space","Enter"],s=["Escape"],l=["Escape"];if(this.optionalKeySupport){["ArrowUp","ArrowRight","ArrowDown","ArrowLeft","Home","End"].includes(t)&&u(e)}else(this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t)||this.elements.parentMenu&&l.includes(t))&&u(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview()):this.currentMenuItem.dom.link.click();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(u(e),this.closeChildren()):this.elements.parentMenu?(u(e),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.closeChildren(),this.elements.parentMenu.focusCurrentChild()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController())}else this.optionalKeySupport&&("ArrowDown"===t||"ArrowRight"===t?(u(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.childMenu.focusFirstChild()):this.focusNextChild()):"ArrowUp"===t||"ArrowLeft"===t?(u(e),this.focusPreviousChild()):"Home"===t?(u(e),this.focusFirstChild()):"End"===t&&(u(e),this.focusLastChild()))}))}}class d extends h{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:i=null,toggle:o=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:i,toggle:o,initialize:!1}),r&&this.initialize()}}class p extends c{_dom={toggle:null,parent:null,container:null};constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l,initialize:!1}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,i&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}class g extends a{_MenuType=g;_MenuItemType=d;_MenuToggleType=p;constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:l=".dropdown",submenuToggleSelector:i=".dropdown-toggle",submenuSelector:o=".dropdown-menu",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,optionalKeySupport:g=!1,initialize:M=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:i,submenuSelector:o,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,optionalKeySupport:g,initialize:!1}),M&&this.initialize()}}class M extends o{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:i=null,toggle:o=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:i,toggle:o}),r&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","menuitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=0)}blur(){super.blur(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=-1)}}class f extends i{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l}),i&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}class b extends m{_MenuType=b;_MenuItemType=M;_MenuToggleType=f;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:l="",submenuToggleSelector:i="a",submenuSelector:o="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:i,submenuSelector:o,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),g&&this.initialize()}initialize(){try{super.initialize(),this.isTopLevel?this.dom.menu.setAttribute("role","menubar"):this.dom.menu.setAttribute("role","menu"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup(),this.isTopLevel&&(this.elements.menuItems[0].dom.link.tabIndex=0)}catch(e){console.error(e)}}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?(this.elements.rootMenu.blur(),this.elements.rootMenu.closeChildren()):this.elements.rootMenu.focus()),"Character"===t)u(e);else if(this.isTopLevel){if("self"===this.focusState){const n=["Space","Enter","ArrowDown","ArrowUp"],s=["Escape"];(["ArrowRight","ArrowLeft","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&u(e)}}else{const n=["Space","Enter"];(["Escape","ArrowRight","ArrowLeft","ArrowDown","ArrowUp","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t))&&u(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e),{altKey:n,crtlKey:s,metaKey:l}=e;if("Character"!==t||(n||s||l))if(this.isTopLevel){if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click();else if("ArrowRight"===t){u(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusNextChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowLeft"===t){u(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusPreviousChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowDown"===t)this.currentMenuItem.isSubmenuItem&&(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()})));else if("ArrowUp"===t)this.currentMenuItem.isSubmenuItem&&(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusLastChild()})));else if("Home"===t)u(e),this.focusFirstChild();else if("End"===t)u(e),this.focusLastChild();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(u(e),this.closeChildren()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(u(e),this.elements.controller.close(),this.focusController())}}else"Space"===t||"Enter"===t?this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click():"Escape"===t?(u(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusCurrentChild()):"ArrowRight"===t?this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):(u(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusNextChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&this.elements.rootMenu.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?this.elements.parentMenu.currentMenuItem.isSubmenuItem&&(u(e),this.elements.parentMenu.currentMenuItem.elements.toggle.close(),this.elements.parentMenu.focusCurrentChild(),this.elements.parentMenu===this.elements.rootMenu&&(this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusPreviousChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&(this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.elements.rootMenu.currentMenuItem.elements.toggle.preview()))):"ArrowDown"===t?(u(e),this.focusNextChild()):"ArrowUp"===t?(u(e),this.focusPreviousChild()):"Home"===t?(u(e),this.focusFirstChild()):"End"===t&&(u(e),this.focusLastChild());else u(e),this.elements.rootMenu.currentEvent="character",this.focusNextChildWithCharacter(e.key)}))}focusNextChild(){this.currentChild===this.elements.menuItems.length-1?this.focusFirstChild():this.focusChild(this.currentChild+1)}focusPreviousChild(){0===this.currentChild?this.focusLastChild():this.focusChild(this.currentChild-1)}focusNextChildWithCharacter(e){const t=e.toLowerCase();let n=this.currentChild+1,s=!1;for(;!s&&n<this.elements.menuItems.length;){let e="";e=this.elements.menuItems[n].dom.item.innerText?this.elements.menuItems[n].dom.item.innerText:this.elements.menuItems[n].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t&&(s=!0,this.focusChild(n)),n++}}}class v extends M{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:i=null,toggle:o=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:i,toggle:o,initialize:!1}),r&&this.initialize()}}class E extends f{_dom={toggle:null,parent:null,container:null};constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l,initialize:!1}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,i&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}class C extends b{_MenuType=C;_MenuItemType=v;_MenuToggleType=E;constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:l=".dropdown",submenuToggleSelector:i=".dropdown-toggle",submenuSelector:o=".dropdown-menu",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:i,submenuSelector:o,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),g&&this.initialize()}}class y extends o{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:i=null,toggle:o=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:i,toggle:o}),r&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","treeitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.dom.link.tabIndex=0}blur(){super.blur(),this.dom.link.tabIndex=-1}}class I extends i{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l}),i&&this.initialize()}}class _ extends m{_MenuType=_;_MenuItemType=y;_MenuToggleType=I;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:l="",submenuToggleSelector:i="a",submenuSelector:o="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:i,submenuSelector:o,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),g&&this.initialize()}initialize(){try{super.initialize(),this.isTopLevel?(this.dom.menu.setAttribute("role","tree"),this.elements.menuItems[0].dom.link.tabIndex=0):this.dom.menu.setAttribute("role","group"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?this.elements.rootMenu.blur():this.elements.rootMenu.focus()),"self"===this.focusState){const n=["Enter","ArrowRight"],s=["Escape"];(["Space","ArrowUp","ArrowDown","ArrowLeft","Asterisk","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&u(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e),{altKey:n,crtlKey:s,metaKey:l}=e;if("Character"!==t||(n||s||l)){if("self"===this.focusState)if("Enter"===t||"Space"===t)u(e),this.currentMenuItem.isSubmenuItem?this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview():this.currentMenuItem.dom.link.click();else if("Escape"===t)this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController());else if("ArrowDown"===t)u(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.isTopLevel||this.currentChild!==this.elements.menuItems.length-1?this.focusNextChild():this.focusParentsNextChild();else if("ArrowUp"===t){u(e);const t=this.elements.menuItems[this.currentChild-1];t&&t.isSubmenuItem&&t.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentChild=this.currentChild-1,this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.focusChildsLastNode()):this.isTopLevel||0!==this.currentChild?this.focusPreviousChild():(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())}else"ArrowRight"===t?this.currentMenuItem.isSubmenuItem&&(u(e),this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?(u(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.toggle.close()):this.isTopLevel||(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())):"Home"===t?(u(e),this.blurCurrentChild(),this.elements.rootMenu.focusFirstChild()):"End"===t?(u(e),this.blurCurrentChild(),this.elements.rootMenu.focusLastNode()):"Asterisk"===t&&(u(e),this.openChildren())}else u(e),this.elements.rootMenu.currentEvent="character",this.focusNextNodeWithCharacter(e.key)}))}focusLastNode(){const e=this.elements.menuItems.length-1,t=this.elements.menuItems[e];t.isSubmenuItem&&t.elements.toggle.isOpen?(this.currentChild=e,t.elements.childMenu.currentEvent=this.currentEvent,t.elements.childMenu.focusLastNode()):this.focusLastChild()}openChildren(){this.elements.submenuToggles.forEach((e=>e.preview()))}focusNextNodeWithCharacter(e){const t=e.toLowerCase(),n=function e(t){let n=[];return t.elements.menuItems.forEach((t=>{n.push(t),t.isSubmenuItem&&t.elements.toggle.isOpen&&(n=[...n,...e(t.elements.toggle.elements.controlledMenu)])})),n}(this.elements.rootMenu),s=n.indexOf(this.currentMenuItem)+1,l=[...n.slice(s),...n.slice(0,s)];let i=0,o=!1;for(;!o&&i<l.length;){let e="";if(e=l[i].dom.item.innerText?l[i].dom.item.innerText:l[i].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t){o=!0;const e=l[i].elements.parentMenu,t=e.elements.menuItems.indexOf(l[i]);this.elements.rootMenu.blurChildren(),e.focusChild(t)}i++}}focusParentsNextChild(){this.elements.parentMenu&&(this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.currentChild===this.elements.parentMenu.elements.menuItems.length-1?(this.elements.parentMenu.blurCurrentChild(),this.elements.parentMenu.focusParentsNextChild()):(this.blurChildren(),this.elements.parentMenu.focusNextChild()))}focusChildsLastNode(){this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusLastChild(),this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle.isOpen&&(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.childMenu.focusChildsLastNode())}}class T extends y{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:i=null,toggle:o=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:i,toggle:o,initialize:!1}),r&&this.initialize()}}class S extends I{_dom={toggle:null,parent:null,container:null};constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l,initialize:!1}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,i&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}class w extends _{_MenuType=w;_MenuItemType=T;_MenuToggleType=S;constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:l=".dropdown",submenuToggleSelector:i=".dropdown-toggle",submenuSelector:o=".dropdown-menu",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:i,submenuSelector:o,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),g&&this.initialize()}}return{Bootstrap4DisclosureMenu:g,Bootstrap4Menubar:C,Bootstrap4Treeview:w}}();
 //# sourceMappingURL=accessible-menu-bs4.min.js.map
diff --git a/dist/accessible-menu-bs4.min.js.map b/dist/accessible-menu-bs4.min.js.map
index c24e1f8..d9d4dd3 100644
--- a/dist/accessible-menu-bs4.min.js.map
+++ b/dist/accessible-menu-bs4.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"accessible-menu-bs4.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/disclosureMenuItem.js","../node_modules/accessible-menu/src/disclosureMenuToggle.js","../node_modules/accessible-menu/src/disclosureMenu.js","../src/bootstrap4DisclosureMenuItem.js","../src/bootstrap4DisclosureMenuToggle.js","../src/bootstrap4DisclosureMenu.js","../node_modules/accessible-menu/src/menubarItem.js","../node_modules/accessible-menu/src/menubarToggle.js","../node_modules/accessible-menu/src/menubar.js","../src/bootstrap4MenubarItem.js","../src/bootstrap4MenubarToggle.js","../src/bootstrap4Menubar.js","../node_modules/accessible-menu/src/treeviewItem.js","../node_modules/accessible-menu/src/treeviewToggle.js","../node_modules/accessible-menu/src/treeview.js","../src/bootstrap4TreeviewItem.js","../src/bootstrap4TreeviewToggle.js","../src/bootstrap4Treeview.js","../rollup.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this.dom.menu.setAttribute(\"role\", \"menubar\");\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4Menubar;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                    [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                    [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                    [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}        [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}        [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}    [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}    [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                   [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Treeview|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                    [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                    [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                   [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      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The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. 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The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, DisclosureMenuToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link DisclosureMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu Bootstrap4DisclosureMenuToggle */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   *\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   *\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   *\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar, MenubarToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      // Set the role of the menu.\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"menubar\");\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"menu\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar Bootstrap4MenubarToggle */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4Menubar;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview, TreeviewToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview Bootstrap4TreeviewToggle */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   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[options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                    [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}        [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}        [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}    [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}    [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                   [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Treeview|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                    [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                    [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                   [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      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\ No newline at end of file
diff --git a/dist/disclosure-menu-bs4.esm.js b/dist/disclosure-menu-bs4.esm.js
index 7087262..6f37f18 100644
--- a/dist/disclosure-menu-bs4.esm.js
+++ b/dist/disclosure-menu-bs4.esm.js
@@ -155,10 +155,28 @@ function isTag(tagName, elements) {
   }
 }
 
-function _defineProperty$5(obj, key, value) { key = _toPropertyKey$5(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$5(arg) { var key = _toPrimitive$5(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$5(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class BaseMenuToggle {
+  _dom = {
+    toggle: null,
+    parent: null
+  };
+  _elements = {
+    controlledMenu: null,
+    parentMenu: null
+  };
+  _open = false;
+  _expandEvent = new CustomEvent("accessibleMenuExpand", {
+    bubbles: true,
+    detail: {
+      toggle: this
+    }
+  });
+  _collapseEvent = new CustomEvent("accessibleMenuCollapse", {
+    bubbles: true,
+    detail: {
+      toggle: this
+    }
+  });
   constructor(_ref) {
     let {
       menuToggleElement,
@@ -166,27 +184,6 @@ class BaseMenuToggle {
       controlledMenu,
       parentMenu = null
     } = _ref;
-    _defineProperty$5(this, "_dom", {
-      toggle: null,
-      parent: null
-    });
-    _defineProperty$5(this, "_elements", {
-      controlledMenu: null,
-      parentMenu: null
-    });
-    _defineProperty$5(this, "_open", false);
-    _defineProperty$5(this, "_expandEvent", new CustomEvent("accessibleMenuExpand", {
-      bubbles: true,
-      detail: {
-        toggle: this
-      }
-    }));
-    _defineProperty$5(this, "_collapseEvent", new CustomEvent("accessibleMenuCollapse", {
-      bubbles: true,
-      detail: {
-        toggle: this
-      }
-    }));
     this._dom.toggle = menuToggleElement;
     this._dom.parent = parentElement;
     this._elements.controlledMenu = controlledMenu;
@@ -331,10 +328,17 @@ class BaseMenuToggle {
   }
 }
 
-function _defineProperty$4(obj, key, value) { key = _toPropertyKey$4(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$4(arg) { var key = _toPrimitive$4(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$4(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class BaseMenuItem {
+  _dom = {
+    item: null,
+    link: null
+  };
+  _elements = {
+    parentMenu: null,
+    childMenu: null,
+    toggle: null
+  };
+  _submenu = false;
   constructor(_ref) {
     let {
       menuItemElement,
@@ -344,16 +348,6 @@ class BaseMenuItem {
       childMenu = null,
       toggle = null
     } = _ref;
-    _defineProperty$4(this, "_dom", {
-      item: null,
-      link: null
-    });
-    _defineProperty$4(this, "_elements", {
-      parentMenu: null,
-      childMenu: null,
-      toggle: null
-    });
-    _defineProperty$4(this, "_submenu", false);
     this._dom.item = menuItemElement;
     this._dom.link = menuLinkElement;
     this._elements.parentMenu = parentMenu;
@@ -410,10 +404,41 @@ function preventEvent(event) {
   event.stopPropagation();
 }
 
-function _defineProperty$3(obj, key, value) { key = _toPropertyKey$3(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$3(arg) { var key = _toPrimitive$3(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$3(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class BaseMenu {
+  _MenuType = BaseMenu;
+  _MenuItemType = BaseMenuItem;
+  _MenuToggleType = BaseMenuToggle;
+  _dom = {
+    menu: null,
+    menuItems: [],
+    submenuItems: [],
+    submenuToggles: [],
+    submenus: [],
+    controller: null,
+    container: null
+  };
+  _selectors = {
+    menuItems: "",
+    menuLinks: "",
+    submenuItems: "",
+    submenuToggles: "",
+    submenus: ""
+  };
+  _elements = {
+    menuItems: [],
+    submenuToggles: [],
+    controller: null,
+    parentMenu: null,
+    rootMenu: null
+  };
+  _openClass = "show";
+  _closeClass = "hide";
+  _root = true;
+  _currentChild = 0;
+  _focusState = "none";
+  _currentEvent = "none";
+  _hoverType = "off";
+  _hoverDelay = 250;
   constructor(_ref) {
     let {
       menuElement,
@@ -431,40 +456,6 @@ class BaseMenu {
       hoverType = "off",
       hoverDelay = 250
     } = _ref;
-    _defineProperty$3(this, "_MenuType", BaseMenu);
-    _defineProperty$3(this, "_MenuItemType", BaseMenuItem);
-    _defineProperty$3(this, "_MenuToggleType", BaseMenuToggle);
-    _defineProperty$3(this, "_dom", {
-      menu: null,
-      menuItems: [],
-      submenuItems: [],
-      submenuToggles: [],
-      submenus: [],
-      controller: null,
-      container: null
-    });
-    _defineProperty$3(this, "_selectors", {
-      menuItems: "",
-      menuLinks: "",
-      submenuItems: "",
-      submenuToggles: "",
-      submenus: ""
-    });
-    _defineProperty$3(this, "_elements", {
-      menuItems: [],
-      submenuToggles: [],
-      controller: null,
-      parentMenu: null,
-      rootMenu: null
-    });
-    _defineProperty$3(this, "_openClass", "show");
-    _defineProperty$3(this, "_closeClass", "hide");
-    _defineProperty$3(this, "_root", true);
-    _defineProperty$3(this, "_currentChild", 0);
-    _defineProperty$3(this, "_focusState", "none");
-    _defineProperty$3(this, "_currentEvent", "none");
-    _defineProperty$3(this, "_hoverType", "off");
-    _defineProperty$3(this, "_hoverDelay", 250);
     this._dom.menu = menuElement;
     this._dom.controller = controllerElement;
     this._dom.container = containerElement;
@@ -917,8 +908,10 @@ class BaseMenu {
         const key = keyPress(event);
         if (key === "Space" || key === "Enter") {
           preventEvent(event);
-          this.elements.controller.open();
-          this.focusFirstChild();
+          this.elements.controller.toggle();
+          if (this.elements.controller.isOpen) {
+            this.focusFirstChild();
+          }
         }
       });
     }
@@ -1061,10 +1054,12 @@ class DisclosureMenuToggle extends BaseMenuToggle {
   }
 }
 
-function _defineProperty$2(obj, key, value) { key = _toPropertyKey$2(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$2(arg) { var key = _toPrimitive$2(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$2(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class DisclosureMenu extends BaseMenu {
+  _MenuType = DisclosureMenu;
+  _MenuItemType = DisclosureMenuItem;
+  _MenuToggleType = DisclosureMenuToggle;
+  _currentChild = -1;
+  _optionalSupport = false;
   constructor(_ref) {
     let {
       menuElement,
@@ -1100,11 +1095,6 @@ class DisclosureMenu extends BaseMenu {
       hoverType,
       hoverDelay
     });
-    _defineProperty$2(this, "_MenuType", DisclosureMenu);
-    _defineProperty$2(this, "_MenuItemType", DisclosureMenuItem);
-    _defineProperty$2(this, "_MenuToggleType", DisclosureMenuToggle);
-    _defineProperty$2(this, "_currentChild", -1);
-    _defineProperty$2(this, "_optionalSupport", false);
     this._optionalSupport = optionalKeySupport;
     if (initialize) {
       this.initialize();
@@ -1261,10 +1251,12 @@ class Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {
   }
 }
 
-function _defineProperty$1(obj, key, value) { key = _toPropertyKey$1(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$1(arg) { var key = _toPrimitive$1(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$1(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {
+  _dom = {
+    toggle: null,
+    parent: null,
+    container: null
+  };
   constructor(_ref) {
     let {
       menuToggleElement,
@@ -1280,11 +1272,6 @@ class Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {
       parentMenu,
       initialize: false
     });
-    _defineProperty$1(this, "_dom", {
-      toggle: null,
-      parent: null,
-      container: null
-    });
     this._dom.toggle = menuToggleElement;
     this._dom.parent = parentElement;
     this._dom.container = controlledMenu.isTopLevel ? controlledMenu.dom.container : controlledMenu.dom.menu;
@@ -1345,10 +1332,10 @@ class Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {
   }
 }
 
-function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class Bootstrap4DisclosureMenu extends DisclosureMenu {
+  _MenuType = Bootstrap4DisclosureMenu;
+  _MenuItemType = Bootstrap4DisclosureMenuItem;
+  _MenuToggleType = Bootstrap4DisclosureMenuToggle;
   constructor(_ref) {
     let {
       menuElement,
@@ -1386,9 +1373,6 @@ class Bootstrap4DisclosureMenu extends DisclosureMenu {
       optionalKeySupport,
       initialize: false
     });
-    _defineProperty(this, "_MenuType", Bootstrap4DisclosureMenu);
-    _defineProperty(this, "_MenuItemType", Bootstrap4DisclosureMenuItem);
-    _defineProperty(this, "_MenuToggleType", Bootstrap4DisclosureMenuToggle);
     if (initialize) {
       this.initialize();
     }
diff --git a/dist/disclosure-menu-bs4.esm.js.map b/dist/disclosure-menu-bs4.esm.js.map
index 94fc225..0c18cdb 100644
--- a/dist/disclosure-menu-bs4.esm.js.map
+++ b/dist/disclosure-menu-bs4.esm.js.map
@@ -1 +1 @@
-{"version":3,"file":"disclosure-menu-bs4.esm.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/disclosureMenuItem.js","../node_modules/accessible-menu/src/disclosureMenuToggle.js","../node_modules/accessible-menu/src/disclosureMenu.js","../src/bootstrap4DisclosureMenuItem.js","../src/bootstrap4DisclosureMenuToggle.js","../src/bootstrap4DisclosureMenu.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. 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The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, DisclosureMenuToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link DisclosureMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu Bootstrap4DisclosureMenuToggle */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   *\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   *\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   *\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    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diff --git a/dist/disclosure-menu-bs4.esm.min.js b/dist/disclosure-menu-bs4.esm.min.js
index 3fa810f..c81555f 100644
--- a/dist/disclosure-menu-bs4.esm.min.js
+++ b/dist/disclosure-menu-bs4.esm.min.js
@@ -1,2 +1,2 @@
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t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function h(e){e.preventDefault(),e.stopPropagation()}function c(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:i="a",submenuSelector:l="ul",controllerElement:m=null,containerElement:h=null,openClass:d="show",closeClass:p="hide",isTopLevel:g=!0,parentMenu:f=null,hoverType:b="off",hoverDelay:v=250}=e;c(this,"_MenuType",a),c(this,"_MenuItemType",u),c(this,"_MenuToggleType",r),c(this,"_dom",{menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null}),c(this,"_selectors",{menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""}),c(this,"_elements",{menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null}),c(this,"_openClass","show"),c(this,"_closeClass","hide"),c(this,"_root",!0),c(this,"_currentChild",0),c(this,"_focusState","none"),c(this,"_currentEvent","none"),c(this,"_hoverType","off"),c(this,"_hoverDelay",250),this._dom.menu=t,this._dom.controller=m,this._dom.container=h,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=o,this._selectors.submenuToggles=i,this._selectors.submenus=l,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=f,this._elements.rootMenu=g?this:null,this._openClass=d||"",this._closeClass=p||"",this._root=g,this._hoverType=b,this._hoverDelay=v}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){o({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let i=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(i=!1):e(HTMLElement,{menuElement:this._dom.menu})||(i=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(i=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(i=!1),""===this._openClass||s({openClass:this._openClass})||(i=!1),""===this._closeClass||s({closeClass:this._closeClass})||(i=!1),t("boolean",{isTopLevel:this._root})||(i=!1),null===this._elements.parentMenu||e(a,{parentMenu:this._elements.parentMenu})||(i=!1),o({hoverType:this._hoverType})||(i=!1),t("number",{hoverDelay:this._hoverDelay})||(i=!1),i}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const o=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?o:[...this._dom[t],...o]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),o=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),i=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:o,parentMenu:this});this._elements.submenuToggles.push(i),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:o,toggle:i})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){h(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||h(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||(h(e),this.elements.controller.open(),this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class d extends u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:i=null,toggle:r=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:i,toggle:r}),l&&this.initialize()}}class p extends r{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o}),i&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}function g(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class f extends a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:i="a",submenuSelector:r="ul",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:b="off",hoverDelay:v=250,optionalKeySupport:y=!1,initialize:_=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:i,submenuSelector:r,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:b,hoverDelay:v}),g(this,"_MenuType",f),g(this,"_MenuItemType",d),g(this,"_MenuToggleType",p),g(this,"_currentChild",-1),g(this,"_optionalSupport",!1),this._optionalSupport=y,_&&this.initialize()}initialize(){try{super.initialize(),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}get optionalKeySupport(){return this.isTopLevel?this._optionalSupport:this.elements.rootMenu.optionalKeySupport}set optionalKeySupport(e){t("boolean",{optionalKeySupport:e}),this._optionalSupport=e}_validate(){let e=super._validate();return t("boolean",{optionalKeySupport:this._optionalSupport})||(e=!1),e}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);if("self"===this.focusState){const n=["Space","Enter"],s=["Escape"],o=["Escape"];if(this.optionalKeySupport){["ArrowUp","ArrowRight","ArrowDown","ArrowLeft","Home","End"].includes(t)&&h(e)}else(this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t)||this.elements.parentMenu&&o.includes(t))&&h(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview()):this.currentMenuItem.dom.link.click();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(h(e),this.closeChildren()):this.elements.parentMenu?(h(e),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.closeChildren(),this.elements.parentMenu.focusCurrentChild()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController())}else this.optionalKeySupport&&("ArrowDown"===t||"ArrowRight"===t?(h(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.childMenu.focusFirstChild()):this.focusNextChild()):"ArrowUp"===t||"ArrowLeft"===t?(h(e),this.focusPreviousChild()):"Home"===t?(h(e),this.focusFirstChild()):"End"===t&&(h(e),this.focusLastChild()))}))}}class b extends d{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:i=null,toggle:r=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:i,toggle:r,initialize:!1}),l&&this.initialize()}}function v(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class y extends p{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o,initialize:!1}),v(this,"_dom",{toggle:null,parent:null,container:null}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,i&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}function _(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class E extends f{constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:o=".dropdown",submenuToggleSelector:i=".dropdown-toggle",submenuSelector:r=".dropdown-menu",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,optionalKeySupport:g=!1,initialize:f=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:i,submenuSelector:r,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,optionalKeySupport:g,initialize:!1}),_(this,"_MenuType",E),_(this,"_MenuItemType",b),_(this,"_MenuToggleType",y),f&&this.initialize()}}export{E as default};
+function e(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${typeof t} given.`)}for(const n in t)if(!(t[n]instanceof e)){const s=typeof t[n];throw new TypeError(`AccessibleMenu: ${n} must be an instance of ${e.name}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function t(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Values given to isValidType() must be inside of an object. ${typeof t} given.`)}for(const n in t){const s=typeof t[n];if(s!==e)throw new TypeError(`AccessibleMenu: ${n} must be a ${e}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function n(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${typeof e} given.`)}for(const t in e)try{if(null===e[t])throw new Error;document.querySelector(e[t])}catch(n){throw new TypeError(`AccessibleMenu: ${t} must be a valid CSS selector. "${e[t]}" given.`)}return!0}catch(e){return console.error(e),!1}}function s(e){try{if("object"!=typeof e||Array.isArray(e)){throw new TypeError(`AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${typeof e} given.`)}for(const t in e){const s=typeof e[t];if("string"!==s){if(!Array.isArray(e[t]))throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. ${s} given.`);e[t].forEach((e=>{if("string"!=typeof e)throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. An array containing non-strings given.`)}))}else{const s={};s[t]=e[t],n(s)}}return!0}catch(e){return console.error(e),!1}}function o(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${typeof e} given.`)}const t=["off","on","dynamic"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}class l{_dom={toggle:null,parent:null};_elements={controlledMenu:null,parentMenu:null};_open=!1;_expandEvent=new CustomEvent("accessibleMenuExpand",{bubbles:!0,detail:{toggle:this}});_collapseEvent=new CustomEvent("accessibleMenuCollapse",{bubbles:!0,detail:{toggle:this}});constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null}=e;this._dom.toggle=t,this._dom.parent=n,this._elements.controlledMenu=s,this._elements.parentMenu=o}initialize(){if(this.dom.toggle.setAttribute("aria-haspopup","true"),this.dom.toggle.setAttribute("aria-expanded","false"),function(n,s){if(t("string",{tagName:n})&&e(HTMLElement,s)){const e=n.toLowerCase();let t=!0;for(const n in s)s[n].tagName.toLowerCase()!==e&&(t=!1);return t}return!1}("button",{toggle:this.dom.toggle})||this.dom.toggle.setAttribute("role","button"),""===this.dom.toggle.id||""===this.elements.controlledMenu.dom.menu.id){const e=Math.random().toString(36).replace(/[^a-z]+/g,"").substr(0,10);let t=this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\s]/g,""),n=e;!t.replace(/\s/g,"").length&&this.dom.toggle.getAttribute("aria-label")&&(t=this.dom.toggle.getAttribute("aria-label").replace(/[^a-zA-Z0-9\s]/g,"")),t.replace(/\s/g,"").length>0&&(t=t.toLowerCase().replace(/\s+/g,"-"),t.startsWith("-")&&(t=t.substring(1)),t.endsWith("-")&&(t=t.slice(0,-1)),n=`${t}-${n}`),this.dom.toggle.id=this.dom.toggle.id||`${n}-menu-button`,this.elements.controlledMenu.dom.menu.id=this.elements.controlledMenu.dom.menu.id||`${n}-menu`}this.elements.controlledMenu.dom.menu.setAttribute("aria-labelledby",this.dom.toggle.id),this.dom.toggle.setAttribute("aria-controls",this.elements.controlledMenu.dom.menu.id),this._collapse(!1)}get dom(){return this._dom}get elements(){return this._elements}get isOpen(){return this._open}set isOpen(e){t("boolean",{value:e}),this._open=e}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.add(n):this.elements.controlledMenu.dom.menu.classList.add(...n)),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.remove(t):this.elements.controlledMenu.dom.menu.classList.remove(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.add(t):this.elements.controlledMenu.dom.menu.classList.add(...t)),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.remove(n):this.elements.controlledMenu.dom.menu.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}open(){this.elements.controlledMenu.focusState="self",this._expand(),this.isOpen=!0}preview(){this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._expand(),this.isOpen=!0}close(){this.isOpen&&(this.elements.controlledMenu.currentChild=0,this.elements.controlledMenu.blur(),this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._collapse(),this.isOpen=!1)}toggle(){this.isOpen?this.close():this.open()}closeSiblings(){this.elements.parentMenu&&this.elements.parentMenu.elements.submenuToggles.forEach((e=>{e!==this&&e.close()}))}closeChildren(){this.elements.controlledMenu.elements.submenuToggles.forEach((e=>e.close()))}}class i{_dom={item:null,link:null};_elements={parentMenu:null,childMenu:null,toggle:null};_submenu=!1;constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null}=e;this._dom.item=t,this._dom.link=n,this._elements.parentMenu=s,this._elements.childMenu=l,this._elements.toggle=i,this._submenu=o}initialize(){}get dom(){return this._dom}get elements(){return this._elements}get isSubmenuItem(){return this._submenu}focus(){this.elements.parentMenu.shouldFocus&&this.dom.link.focus()}blur(){this.elements.parentMenu.shouldFocus&&this.dom.link.blur()}}function r(e){try{const t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function u(e){e.preventDefault(),e.stopPropagation()}class m{_MenuType=m;_MenuItemType=i;_MenuToggleType=l;_dom={menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null};_selectors={menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""};_elements={menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null};_openClass="show";_closeClass="hide";_root=!0;_currentChild=0;_focusState="none";_currentEvent="none";_hoverType="off";_hoverDelay=250;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:l="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250}=e;this._dom.menu=t,this._dom.controller=r,this._dom.container=u,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=o,this._selectors.submenuToggles=l,this._selectors.submenus=i,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=a,this._elements.rootMenu=c?this:null,this._openClass=m||"",this._closeClass=h||"",this._root=c,this._hoverType=d,this._hoverDelay=p}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){o({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let l=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(l=!1):e(HTMLElement,{menuElement:this._dom.menu})||(l=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(l=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(l=!1),""===this._openClass||s({openClass:this._openClass})||(l=!1),""===this._closeClass||s({closeClass:this._closeClass})||(l=!1),t("boolean",{isTopLevel:this._root})||(l=!1),null===this._elements.parentMenu||e(m,{parentMenu:this._elements.parentMenu})||(l=!1),o({hoverType:this._hoverType})||(l=!1),t("number",{hoverDelay:this._hoverDelay})||(l=!1),l}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const o=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?o:[...this._dom[t],...o]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),o=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),l=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:o,parentMenu:this});this._elements.submenuToggles.push(l),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:o,toggle:l})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){u(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||u(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||(u(e),this.elements.controller.toggle(),this.elements.controller.isOpen&&this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class h extends i{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:l,toggle:i}),r&&this.initialize()}}class c extends l{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:l=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o}),l&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}class a extends m{_MenuType=a;_MenuItemType=h;_MenuToggleType=c;_currentChild=-1;_optionalSupport=!1;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:l="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,optionalKeySupport:g=!1,initialize:f=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:l,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),this._optionalSupport=g,f&&this.initialize()}initialize(){try{super.initialize(),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}get optionalKeySupport(){return this.isTopLevel?this._optionalSupport:this.elements.rootMenu.optionalKeySupport}set optionalKeySupport(e){t("boolean",{optionalKeySupport:e}),this._optionalSupport=e}_validate(){let e=super._validate();return t("boolean",{optionalKeySupport:this._optionalSupport})||(e=!1),e}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);if("self"===this.focusState){const n=["Space","Enter"],s=["Escape"],o=["Escape"];if(this.optionalKeySupport){["ArrowUp","ArrowRight","ArrowDown","ArrowLeft","Home","End"].includes(t)&&u(e)}else(this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t)||this.elements.parentMenu&&o.includes(t))&&u(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview()):this.currentMenuItem.dom.link.click();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(u(e),this.closeChildren()):this.elements.parentMenu?(u(e),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.closeChildren(),this.elements.parentMenu.focusCurrentChild()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController())}else this.optionalKeySupport&&("ArrowDown"===t||"ArrowRight"===t?(u(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.childMenu.focusFirstChild()):this.focusNextChild()):"ArrowUp"===t||"ArrowLeft"===t?(u(e),this.focusPreviousChild()):"Home"===t?(u(e),this.focusFirstChild()):"End"===t&&(u(e),this.focusLastChild()))}))}}class d extends h{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:l,toggle:i,initialize:!1}),r&&this.initialize()}}class p extends c{_dom={toggle:null,parent:null,container:null};constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:l=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o,initialize:!1}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,l&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}class g extends a{_MenuType=g;_MenuItemType=d;_MenuToggleType=p;constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:o=".dropdown",submenuToggleSelector:l=".dropdown-toggle",submenuSelector:i=".dropdown-menu",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,optionalKeySupport:g=!1,initialize:f=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:l,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,optionalKeySupport:g,initialize:!1}),f&&this.initialize()}}export{g as default};
 //# sourceMappingURL=disclosure-menu-bs4.esm.min.js.map
diff --git a/dist/disclosure-menu-bs4.esm.min.js.map b/dist/disclosure-menu-bs4.esm.min.js.map
index adcb785..10999fa 100644
--- a/dist/disclosure-menu-bs4.esm.min.js.map
+++ b/dist/disclosure-menu-bs4.esm.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"disclosure-menu-bs4.esm.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/disclosureMenuItem.js","../node_modules/accessible-menu/src/disclosureMenuToggle.js","../node_modules/accessible-menu/src/disclosureMenu.js","../src/bootstrap4DisclosureMenuItem.js","../src/bootstrap4DisclosureMenuToggle.js","../src/bootstrap4DisclosureMenu.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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\ No newline at end of file
+{"version":3,"file":"disclosure-menu-bs4.esm.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/disclosureMenuItem.js","../node_modules/accessible-menu/src/disclosureMenuToggle.js","../node_modules/accessible-menu/src/disclosureMenu.js","../src/bootstrap4DisclosureMenuItem.js","../src/bootstrap4DisclosureMenuToggle.js","../src/bootstrap4DisclosureMenu.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, DisclosureMenuToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link DisclosureMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu Bootstrap4DisclosureMenuToggle */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   *\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   *\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   *\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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\ No newline at end of file
diff --git a/dist/disclosure-menu-bs4.js b/dist/disclosure-menu-bs4.js
index cb85fdc..5e3940f 100644
--- a/dist/disclosure-menu-bs4.js
+++ b/dist/disclosure-menu-bs4.js
@@ -158,10 +158,28 @@ var Bootstrap4DisclosureMenu = (function () {
     }
   }
 
-  function _defineProperty$5(obj, key, value) { key = _toPropertyKey$5(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$5(arg) { var key = _toPrimitive$5(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$5(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenuToggle {
+    _dom = {
+      toggle: null,
+      parent: null
+    };
+    _elements = {
+      controlledMenu: null,
+      parentMenu: null
+    };
+    _open = false;
+    _expandEvent = new CustomEvent("accessibleMenuExpand", {
+      bubbles: true,
+      detail: {
+        toggle: this
+      }
+    });
+    _collapseEvent = new CustomEvent("accessibleMenuCollapse", {
+      bubbles: true,
+      detail: {
+        toggle: this
+      }
+    });
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -169,27 +187,6 @@ var Bootstrap4DisclosureMenu = (function () {
         controlledMenu,
         parentMenu = null
       } = _ref;
-      _defineProperty$5(this, "_dom", {
-        toggle: null,
-        parent: null
-      });
-      _defineProperty$5(this, "_elements", {
-        controlledMenu: null,
-        parentMenu: null
-      });
-      _defineProperty$5(this, "_open", false);
-      _defineProperty$5(this, "_expandEvent", new CustomEvent("accessibleMenuExpand", {
-        bubbles: true,
-        detail: {
-          toggle: this
-        }
-      }));
-      _defineProperty$5(this, "_collapseEvent", new CustomEvent("accessibleMenuCollapse", {
-        bubbles: true,
-        detail: {
-          toggle: this
-        }
-      }));
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._elements.controlledMenu = controlledMenu;
@@ -334,10 +331,17 @@ var Bootstrap4DisclosureMenu = (function () {
     }
   }
 
-  function _defineProperty$4(obj, key, value) { key = _toPropertyKey$4(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$4(arg) { var key = _toPrimitive$4(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$4(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenuItem {
+    _dom = {
+      item: null,
+      link: null
+    };
+    _elements = {
+      parentMenu: null,
+      childMenu: null,
+      toggle: null
+    };
+    _submenu = false;
     constructor(_ref) {
       let {
         menuItemElement,
@@ -347,16 +351,6 @@ var Bootstrap4DisclosureMenu = (function () {
         childMenu = null,
         toggle = null
       } = _ref;
-      _defineProperty$4(this, "_dom", {
-        item: null,
-        link: null
-      });
-      _defineProperty$4(this, "_elements", {
-        parentMenu: null,
-        childMenu: null,
-        toggle: null
-      });
-      _defineProperty$4(this, "_submenu", false);
       this._dom.item = menuItemElement;
       this._dom.link = menuLinkElement;
       this._elements.parentMenu = parentMenu;
@@ -413,10 +407,41 @@ var Bootstrap4DisclosureMenu = (function () {
     event.stopPropagation();
   }
 
-  function _defineProperty$3(obj, key, value) { key = _toPropertyKey$3(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$3(arg) { var key = _toPrimitive$3(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$3(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenu {
+    _MenuType = BaseMenu;
+    _MenuItemType = BaseMenuItem;
+    _MenuToggleType = BaseMenuToggle;
+    _dom = {
+      menu: null,
+      menuItems: [],
+      submenuItems: [],
+      submenuToggles: [],
+      submenus: [],
+      controller: null,
+      container: null
+    };
+    _selectors = {
+      menuItems: "",
+      menuLinks: "",
+      submenuItems: "",
+      submenuToggles: "",
+      submenus: ""
+    };
+    _elements = {
+      menuItems: [],
+      submenuToggles: [],
+      controller: null,
+      parentMenu: null,
+      rootMenu: null
+    };
+    _openClass = "show";
+    _closeClass = "hide";
+    _root = true;
+    _currentChild = 0;
+    _focusState = "none";
+    _currentEvent = "none";
+    _hoverType = "off";
+    _hoverDelay = 250;
     constructor(_ref) {
       let {
         menuElement,
@@ -434,40 +459,6 @@ var Bootstrap4DisclosureMenu = (function () {
         hoverType = "off",
         hoverDelay = 250
       } = _ref;
-      _defineProperty$3(this, "_MenuType", BaseMenu);
-      _defineProperty$3(this, "_MenuItemType", BaseMenuItem);
-      _defineProperty$3(this, "_MenuToggleType", BaseMenuToggle);
-      _defineProperty$3(this, "_dom", {
-        menu: null,
-        menuItems: [],
-        submenuItems: [],
-        submenuToggles: [],
-        submenus: [],
-        controller: null,
-        container: null
-      });
-      _defineProperty$3(this, "_selectors", {
-        menuItems: "",
-        menuLinks: "",
-        submenuItems: "",
-        submenuToggles: "",
-        submenus: ""
-      });
-      _defineProperty$3(this, "_elements", {
-        menuItems: [],
-        submenuToggles: [],
-        controller: null,
-        parentMenu: null,
-        rootMenu: null
-      });
-      _defineProperty$3(this, "_openClass", "show");
-      _defineProperty$3(this, "_closeClass", "hide");
-      _defineProperty$3(this, "_root", true);
-      _defineProperty$3(this, "_currentChild", 0);
-      _defineProperty$3(this, "_focusState", "none");
-      _defineProperty$3(this, "_currentEvent", "none");
-      _defineProperty$3(this, "_hoverType", "off");
-      _defineProperty$3(this, "_hoverDelay", 250);
       this._dom.menu = menuElement;
       this._dom.controller = controllerElement;
       this._dom.container = containerElement;
@@ -920,8 +911,10 @@ var Bootstrap4DisclosureMenu = (function () {
           const key = keyPress(event);
           if (key === "Space" || key === "Enter") {
             preventEvent(event);
-            this.elements.controller.open();
-            this.focusFirstChild();
+            this.elements.controller.toggle();
+            if (this.elements.controller.isOpen) {
+              this.focusFirstChild();
+            }
           }
         });
       }
@@ -1064,10 +1057,12 @@ var Bootstrap4DisclosureMenu = (function () {
     }
   }
 
-  function _defineProperty$2(obj, key, value) { key = _toPropertyKey$2(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$2(arg) { var key = _toPrimitive$2(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$2(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class DisclosureMenu extends BaseMenu {
+    _MenuType = DisclosureMenu;
+    _MenuItemType = DisclosureMenuItem;
+    _MenuToggleType = DisclosureMenuToggle;
+    _currentChild = -1;
+    _optionalSupport = false;
     constructor(_ref) {
       let {
         menuElement,
@@ -1103,11 +1098,6 @@ var Bootstrap4DisclosureMenu = (function () {
         hoverType,
         hoverDelay
       });
-      _defineProperty$2(this, "_MenuType", DisclosureMenu);
-      _defineProperty$2(this, "_MenuItemType", DisclosureMenuItem);
-      _defineProperty$2(this, "_MenuToggleType", DisclosureMenuToggle);
-      _defineProperty$2(this, "_currentChild", -1);
-      _defineProperty$2(this, "_optionalSupport", false);
       this._optionalSupport = optionalKeySupport;
       if (initialize) {
         this.initialize();
@@ -1264,10 +1254,12 @@ var Bootstrap4DisclosureMenu = (function () {
     }
   }
 
-  function _defineProperty$1(obj, key, value) { key = _toPropertyKey$1(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$1(arg) { var key = _toPrimitive$1(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$1(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {
+    _dom = {
+      toggle: null,
+      parent: null,
+      container: null
+    };
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -1283,11 +1275,6 @@ var Bootstrap4DisclosureMenu = (function () {
         parentMenu,
         initialize: false
       });
-      _defineProperty$1(this, "_dom", {
-        toggle: null,
-        parent: null,
-        container: null
-      });
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._dom.container = controlledMenu.isTopLevel ? controlledMenu.dom.container : controlledMenu.dom.menu;
@@ -1348,10 +1335,10 @@ var Bootstrap4DisclosureMenu = (function () {
     }
   }
 
-  function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4DisclosureMenu extends DisclosureMenu {
+    _MenuType = Bootstrap4DisclosureMenu;
+    _MenuItemType = Bootstrap4DisclosureMenuItem;
+    _MenuToggleType = Bootstrap4DisclosureMenuToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -1389,9 +1376,6 @@ var Bootstrap4DisclosureMenu = (function () {
         optionalKeySupport,
         initialize: false
       });
-      _defineProperty(this, "_MenuType", Bootstrap4DisclosureMenu);
-      _defineProperty(this, "_MenuItemType", Bootstrap4DisclosureMenuItem);
-      _defineProperty(this, "_MenuToggleType", Bootstrap4DisclosureMenuToggle);
       if (initialize) {
         this.initialize();
       }
diff --git a/dist/disclosure-menu-bs4.js.map b/dist/disclosure-menu-bs4.js.map
index 10ca26d..ab55086 100644
--- a/dist/disclosure-menu-bs4.js.map
+++ b/dist/disclosure-menu-bs4.js.map
@@ -1 +1 @@
-{"version":3,"file":"disclosure-menu-bs4.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/disclosureMenuItem.js","../node_modules/accessible-menu/src/disclosureMenuToggle.js","../node_modules/accessible-menu/src/disclosureMenu.js","../src/bootstrap4DisclosureMenuItem.js","../src/bootstrap4DisclosureMenuToggle.js","../src/bootstrap4DisclosureMenu.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The 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off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. 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The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, DisclosureMenuToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link DisclosureMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu Bootstrap4DisclosureMenuToggle */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   *\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   *\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   *\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    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diff --git a/dist/disclosure-menu-bs4.min.js b/dist/disclosure-menu-bs4.min.js
index 52715a4..5520e6d 100644
--- a/dist/disclosure-menu-bs4.min.js
+++ b/dist/disclosure-menu-bs4.min.js
@@ -1,2 +1,2 @@
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t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function h(e){e.preventDefault(),e.stopPropagation()}function c(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:i="a",submenuSelector:l="ul",controllerElement:m=null,containerElement:h=null,openClass:d="show",closeClass:p="hide",isTopLevel:g=!0,parentMenu:f=null,hoverType:b="off",hoverDelay:v=250}=e;c(this,"_MenuType",a),c(this,"_MenuItemType",u),c(this,"_MenuToggleType",r),c(this,"_dom",{menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null}),c(this,"_selectors",{menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""}),c(this,"_elements",{menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null}),c(this,"_openClass","show"),c(this,"_closeClass","hide"),c(this,"_root",!0),c(this,"_currentChild",0),c(this,"_focusState","none"),c(this,"_currentEvent","none"),c(this,"_hoverType","off"),c(this,"_hoverDelay",250),this._dom.menu=t,this._dom.controller=m,this._dom.container=h,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=o,this._selectors.submenuToggles=i,this._selectors.submenus=l,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=f,this._elements.rootMenu=g?this:null,this._openClass=d||"",this._closeClass=p||"",this._root=g,this._hoverType=b,this._hoverDelay=v}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){o({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let i=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(i=!1):e(HTMLElement,{menuElement:this._dom.menu})||(i=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(i=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(i=!1),""===this._openClass||s({openClass:this._openClass})||(i=!1),""===this._closeClass||s({closeClass:this._closeClass})||(i=!1),t("boolean",{isTopLevel:this._root})||(i=!1),null===this._elements.parentMenu||e(a,{parentMenu:this._elements.parentMenu})||(i=!1),o({hoverType:this._hoverType})||(i=!1),t("number",{hoverDelay:this._hoverDelay})||(i=!1),i}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const o=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?o:[...this._dom[t],...o]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),o=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),i=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:o,parentMenu:this});this._elements.submenuToggles.push(i),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:o,toggle:i})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){h(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||h(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||(h(e),this.elements.controller.open(),this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class d extends u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:i=null,toggle:r=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:i,toggle:r}),l&&this.initialize()}}class p extends r{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o}),i&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}function g(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class f extends a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:i="a",submenuSelector:r="ul",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:b="off",hoverDelay:v=250,optionalKeySupport:y=!1,initialize:_=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:i,submenuSelector:r,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:b,hoverDelay:v}),g(this,"_MenuType",f),g(this,"_MenuItemType",d),g(this,"_MenuToggleType",p),g(this,"_currentChild",-1),g(this,"_optionalSupport",!1),this._optionalSupport=y,_&&this.initialize()}initialize(){try{super.initialize(),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}get optionalKeySupport(){return this.isTopLevel?this._optionalSupport:this.elements.rootMenu.optionalKeySupport}set optionalKeySupport(e){t("boolean",{optionalKeySupport:e}),this._optionalSupport=e}_validate(){let e=super._validate();return t("boolean",{optionalKeySupport:this._optionalSupport})||(e=!1),e}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);if("self"===this.focusState){const n=["Space","Enter"],s=["Escape"],o=["Escape"];if(this.optionalKeySupport){["ArrowUp","ArrowRight","ArrowDown","ArrowLeft","Home","End"].includes(t)&&h(e)}else(this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t)||this.elements.parentMenu&&o.includes(t))&&h(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview()):this.currentMenuItem.dom.link.click();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(h(e),this.closeChildren()):this.elements.parentMenu?(h(e),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.closeChildren(),this.elements.parentMenu.focusCurrentChild()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController())}else this.optionalKeySupport&&("ArrowDown"===t||"ArrowRight"===t?(h(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.childMenu.focusFirstChild()):this.focusNextChild()):"ArrowUp"===t||"ArrowLeft"===t?(h(e),this.focusPreviousChild()):"Home"===t?(h(e),this.focusFirstChild()):"End"===t&&(h(e),this.focusLastChild()))}))}}class b extends d{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:i=null,toggle:r=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:i,toggle:r,initialize:!1}),l&&this.initialize()}}function v(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class y extends p{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o,initialize:!1}),v(this,"_dom",{toggle:null,parent:null,container:null}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,i&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}function _(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class E extends f{constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:o=".dropdown",submenuToggleSelector:i=".dropdown-toggle",submenuSelector:r=".dropdown-menu",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,optionalKeySupport:g=!1,initialize:f=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:i,submenuSelector:r,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,optionalKeySupport:g,initialize:!1}),_(this,"_MenuType",E),_(this,"_MenuItemType",b),_(this,"_MenuToggleType",y),f&&this.initialize()}}return E}();
+var Bootstrap4DisclosureMenu=function(){"use strict";function e(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${typeof t} given.`)}for(const n in t)if(!(t[n]instanceof e)){const s=typeof t[n];throw new TypeError(`AccessibleMenu: ${n} must be an instance of ${e.name}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function t(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Values given to isValidType() must be inside of an object. ${typeof t} given.`)}for(const n in t){const s=typeof t[n];if(s!==e)throw new TypeError(`AccessibleMenu: ${n} must be a ${e}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function n(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${typeof e} given.`)}for(const t in e)try{if(null===e[t])throw new Error;document.querySelector(e[t])}catch(n){throw new TypeError(`AccessibleMenu: ${t} must be a valid CSS selector. "${e[t]}" given.`)}return!0}catch(e){return console.error(e),!1}}function s(e){try{if("object"!=typeof e||Array.isArray(e)){throw new TypeError(`AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${typeof e} given.`)}for(const t in e){const s=typeof e[t];if("string"!==s){if(!Array.isArray(e[t]))throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. ${s} given.`);e[t].forEach((e=>{if("string"!=typeof e)throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. An array containing non-strings given.`)}))}else{const s={};s[t]=e[t],n(s)}}return!0}catch(e){return console.error(e),!1}}function o(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${typeof e} given.`)}const t=["off","on","dynamic"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}class l{_dom={toggle:null,parent:null};_elements={controlledMenu:null,parentMenu:null};_open=!1;_expandEvent=new CustomEvent("accessibleMenuExpand",{bubbles:!0,detail:{toggle:this}});_collapseEvent=new CustomEvent("accessibleMenuCollapse",{bubbles:!0,detail:{toggle:this}});constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null}=e;this._dom.toggle=t,this._dom.parent=n,this._elements.controlledMenu=s,this._elements.parentMenu=o}initialize(){if(this.dom.toggle.setAttribute("aria-haspopup","true"),this.dom.toggle.setAttribute("aria-expanded","false"),function(n,s){if(t("string",{tagName:n})&&e(HTMLElement,s)){const e=n.toLowerCase();let t=!0;for(const n in s)s[n].tagName.toLowerCase()!==e&&(t=!1);return t}return!1}("button",{toggle:this.dom.toggle})||this.dom.toggle.setAttribute("role","button"),""===this.dom.toggle.id||""===this.elements.controlledMenu.dom.menu.id){const e=Math.random().toString(36).replace(/[^a-z]+/g,"").substr(0,10);let t=this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\s]/g,""),n=e;!t.replace(/\s/g,"").length&&this.dom.toggle.getAttribute("aria-label")&&(t=this.dom.toggle.getAttribute("aria-label").replace(/[^a-zA-Z0-9\s]/g,"")),t.replace(/\s/g,"").length>0&&(t=t.toLowerCase().replace(/\s+/g,"-"),t.startsWith("-")&&(t=t.substring(1)),t.endsWith("-")&&(t=t.slice(0,-1)),n=`${t}-${n}`),this.dom.toggle.id=this.dom.toggle.id||`${n}-menu-button`,this.elements.controlledMenu.dom.menu.id=this.elements.controlledMenu.dom.menu.id||`${n}-menu`}this.elements.controlledMenu.dom.menu.setAttribute("aria-labelledby",this.dom.toggle.id),this.dom.toggle.setAttribute("aria-controls",this.elements.controlledMenu.dom.menu.id),this._collapse(!1)}get dom(){return this._dom}get elements(){return this._elements}get isOpen(){return this._open}set isOpen(e){t("boolean",{value:e}),this._open=e}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.add(n):this.elements.controlledMenu.dom.menu.classList.add(...n)),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.remove(t):this.elements.controlledMenu.dom.menu.classList.remove(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.add(t):this.elements.controlledMenu.dom.menu.classList.add(...t)),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.remove(n):this.elements.controlledMenu.dom.menu.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}open(){this.elements.controlledMenu.focusState="self",this._expand(),this.isOpen=!0}preview(){this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._expand(),this.isOpen=!0}close(){this.isOpen&&(this.elements.controlledMenu.currentChild=0,this.elements.controlledMenu.blur(),this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._collapse(),this.isOpen=!1)}toggle(){this.isOpen?this.close():this.open()}closeSiblings(){this.elements.parentMenu&&this.elements.parentMenu.elements.submenuToggles.forEach((e=>{e!==this&&e.close()}))}closeChildren(){this.elements.controlledMenu.elements.submenuToggles.forEach((e=>e.close()))}}class i{_dom={item:null,link:null};_elements={parentMenu:null,childMenu:null,toggle:null};_submenu=!1;constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null}=e;this._dom.item=t,this._dom.link=n,this._elements.parentMenu=s,this._elements.childMenu=l,this._elements.toggle=i,this._submenu=o}initialize(){}get dom(){return this._dom}get elements(){return this._elements}get isSubmenuItem(){return this._submenu}focus(){this.elements.parentMenu.shouldFocus&&this.dom.link.focus()}blur(){this.elements.parentMenu.shouldFocus&&this.dom.link.blur()}}function r(e){try{const t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function u(e){e.preventDefault(),e.stopPropagation()}class m{_MenuType=m;_MenuItemType=i;_MenuToggleType=l;_dom={menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null};_selectors={menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""};_elements={menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null};_openClass="show";_closeClass="hide";_root=!0;_currentChild=0;_focusState="none";_currentEvent="none";_hoverType="off";_hoverDelay=250;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:l="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250}=e;this._dom.menu=t,this._dom.controller=r,this._dom.container=u,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=o,this._selectors.submenuToggles=l,this._selectors.submenus=i,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=a,this._elements.rootMenu=c?this:null,this._openClass=m||"",this._closeClass=h||"",this._root=c,this._hoverType=d,this._hoverDelay=p}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){o({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let l=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(l=!1):e(HTMLElement,{menuElement:this._dom.menu})||(l=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(l=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(l=!1),""===this._openClass||s({openClass:this._openClass})||(l=!1),""===this._closeClass||s({closeClass:this._closeClass})||(l=!1),t("boolean",{isTopLevel:this._root})||(l=!1),null===this._elements.parentMenu||e(m,{parentMenu:this._elements.parentMenu})||(l=!1),o({hoverType:this._hoverType})||(l=!1),t("number",{hoverDelay:this._hoverDelay})||(l=!1),l}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const o=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?o:[...this._dom[t],...o]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),o=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),l=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:o,parentMenu:this});this._elements.submenuToggles.push(l),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:o,toggle:l})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){u(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||u(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||(u(e),this.elements.controller.toggle(),this.elements.controller.isOpen&&this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class h extends i{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:l,toggle:i}),r&&this.initialize()}}class c extends l{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:l=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o}),l&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}class a extends m{_MenuType=a;_MenuItemType=h;_MenuToggleType=c;_currentChild=-1;_optionalSupport=!1;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:l="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,optionalKeySupport:g=!1,initialize:f=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:l,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),this._optionalSupport=g,f&&this.initialize()}initialize(){try{super.initialize(),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}get optionalKeySupport(){return this.isTopLevel?this._optionalSupport:this.elements.rootMenu.optionalKeySupport}set optionalKeySupport(e){t("boolean",{optionalKeySupport:e}),this._optionalSupport=e}_validate(){let e=super._validate();return t("boolean",{optionalKeySupport:this._optionalSupport})||(e=!1),e}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);if("self"===this.focusState){const n=["Space","Enter"],s=["Escape"],o=["Escape"];if(this.optionalKeySupport){["ArrowUp","ArrowRight","ArrowDown","ArrowLeft","Home","End"].includes(t)&&u(e)}else(this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t)||this.elements.parentMenu&&o.includes(t))&&u(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview()):this.currentMenuItem.dom.link.click();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(u(e),this.closeChildren()):this.elements.parentMenu?(u(e),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.closeChildren(),this.elements.parentMenu.focusCurrentChild()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController())}else this.optionalKeySupport&&("ArrowDown"===t||"ArrowRight"===t?(u(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.childMenu.focusFirstChild()):this.focusNextChild()):"ArrowUp"===t||"ArrowLeft"===t?(u(e),this.focusPreviousChild()):"Home"===t?(u(e),this.focusFirstChild()):"End"===t&&(u(e),this.focusLastChild()))}))}}class d extends h{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:l,toggle:i,initialize:!1}),r&&this.initialize()}}class p extends c{_dom={toggle:null,parent:null,container:null};constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:l=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o,initialize:!1}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,l&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}class g extends a{_MenuType=g;_MenuItemType=d;_MenuToggleType=p;constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:o=".dropdown",submenuToggleSelector:l=".dropdown-toggle",submenuSelector:i=".dropdown-menu",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,optionalKeySupport:g=!1,initialize:f=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:l,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,optionalKeySupport:g,initialize:!1}),f&&this.initialize()}}return g}();
 //# sourceMappingURL=disclosure-menu-bs4.min.js.map
diff --git a/dist/disclosure-menu-bs4.min.js.map b/dist/disclosure-menu-bs4.min.js.map
index c8c9427..46d9e2c 100644
--- a/dist/disclosure-menu-bs4.min.js.map
+++ b/dist/disclosure-menu-bs4.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"disclosure-menu-bs4.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/disclosureMenuItem.js","../node_modules/accessible-menu/src/disclosureMenuToggle.js","../node_modules/accessible-menu/src/disclosureMenu.js","../src/bootstrap4DisclosureMenuItem.js","../src/bootstrap4DisclosureMenuToggle.js","../src/bootstrap4DisclosureMenu.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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\ No newline at end of file
+{"version":3,"file":"disclosure-menu-bs4.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/disclosureMenuItem.js","../node_modules/accessible-menu/src/disclosureMenuToggle.js","../node_modules/accessible-menu/src/disclosureMenu.js","../src/bootstrap4DisclosureMenuItem.js","../src/bootstrap4DisclosureMenuToggle.js","../src/bootstrap4DisclosureMenu.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, DisclosureMenuToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuItem\n */\nclass DisclosureMenuItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                    options                         - The options for generating the menu item.\n   * @param {HTMLElement}               options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}               options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                   [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                   [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link DisclosureMenu}.\n *\n * @extends BaseMenuToggle\n */\nclass DisclosureMenuToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}              options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}         options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}         options.parentElement       - The element containing the controlled menu.\n   * @param {DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}             [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link DisclosureMenuToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default DisclosureMenuToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport DisclosureMenuItem from \"./disclosureMenuItem.js\";\nimport DisclosureMenuToggle from \"./disclosureMenuToggle.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\nimport { isValidType } from \"./validate.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { DisclosureMenu } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new DisclosureMenu({\n *   menuElement,\n * });\n */\nclass DisclosureMenu extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenu}\n   */\n  _MenuType = DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuItem}\n   */\n  _MenuItemType = DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof DisclosureMenuToggle}\n   */\n  _MenuToggleType = DisclosureMenuToggle;\n\n  /**\n   * The index of the currently selected {@link DisclosureMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = -1;\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _optionalSupport = false;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                              - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                  - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]          - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]          - A flag to mark the root menu.\n   * @param {(DisclosureMenu|null)}  [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    // Set optional key support.\n    this._optionalSupport = optionalKeySupport;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link DisclosureMenu#_handleFocus|focus},\n   * {@link DisclosureMenu#_handleClick|click},\n   * {@link DisclosureMenu#_handleHover|hover},\n   * {@link DisclosureMenu#_handleKeydown|keydown}, and\n   * {@link DisclosureMenu#_handleKeyup|keyup} events for the menu.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * A flag to add optional keyboard support (Arrow keys, \"Home\", and \"End\") to the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's optionalKeySupport.\n   *\n   * @type {boolean}\n   *\n   * @see _optionalSupport\n   */\n  get optionalKeySupport() {\n    return this.isTopLevel\n      ? this._optionalSupport\n      : this.elements.rootMenu.optionalKeySupport;\n  }\n\n  set optionalKeySupport(value) {\n    isValidType(\"boolean\", { optionalKeySupport: value });\n\n    this._optionalSupport = value;\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = super._validate();\n\n    if (\n      !isValidType(\"boolean\", { optionalKeySupport: this._optionalSupport })\n    ) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link DisclosureMenu#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"Space\", \"Enter\", and \"Escape\".\n   *   - _If_ {@link DisclosureMenu#optionalKeySupport|optional keyboard support}\n   *     is enabled, blocks propagation on the following keys:\n   *     \"ArrowUp\", \"ArrowRight\", \"ArrowDown\", \"ArrowLeft\", \"Home\", and \"End\".\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (this.focusState === \"self\") {\n        const submenuKeys = [\"Space\", \"Enter\"];\n        const controllerKeys = [\"Escape\"];\n        const parentKeys = [\"Escape\"];\n\n        if (this.optionalKeySupport) {\n          const keys = [\n            \"ArrowUp\",\n            \"ArrowRight\",\n            \"ArrowDown\",\n            \"ArrowLeft\",\n            \"Home\",\n            \"End\",\n          ];\n          if (keys.includes(key)) {\n            preventEvent(event);\n          }\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        } else if (this.elements.parentMenu && parentKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html#kbd_label|WAI ARIA Pracitices Example Disclosure for Navigation Menus}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Tab_ or _Shift + Tab_ | Move keyboard focus among top-level buttons, and if a dropdown is open, into and through links in the dropdown. |\n   * | _Space_ or _Enter_ | <ul><li>If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.</li><li>If focus is on a link:<ul><li>If any link has aria-current set, removes it.</li><li>Sets aria-current=\"page\" on the focused link.</li><li>Activates the focused link.</li></ul></li></ul> |\n   * | _Escape_ | If a dropdown is open, closes it and sets focus on the button that controls that dropdown. |\n   * | _Down Arrow_ or _Right Arrow_ (Optional}) | <ul><li>If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.</li><li>if focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.</li><li>If focus is on a link, and it is not the last link, moves focus to the next link.</li></ul> |\n   * | _Up Arrow_ or _Left Arrow_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the previous button.</li><li>If focus is on a link, and it is not the first link, moves focus to the previous link.</li></ul> |\n   * | _Home_ (Optional}) | <ul><li>If focus is on a button, and it is not the first button, moves focus to the first button.</li><li>If focus is on a link, and it is not the first link, moves focus to the first link.</li></ul> |\n   * | _End_ (Optional}) | <ul><li>If focus is on a button, and it is not the last button, moves focus to the last button.</li><li>If focus is on a link, and it is not the last link, moves focus to the last link.</li></ul> |\n   *\n   * The optional keybindings are controlled by the menu's {@link DisclosureMenu#optionalKeySupport|optionalKeySupport} value.\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (this.focusState === \"self\") {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - If focus is on a disclosure button, activates the button, which toggles the visibility of the dropdown.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape\n          // - If a dropdown is open, closes it.\n          // - If was within the closed dropdown, sets focus on the button that controls that dropdown.\n          const hasOpenChild = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n\n          if (hasOpenChild) {\n            preventEvent(event);\n            this.closeChildren();\n          } else if (this.elements.parentMenu) {\n            preventEvent(event);\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.closeChildren();\n            this.elements.parentMenu.focusCurrentChild();\n          } else if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (this.optionalKeySupport) {\n          if (key === \"ArrowDown\" || key === \"ArrowRight\") {\n            // Hitting the Down or Right Arrow:\n            // - If focus is on a button and its dropdown is collapsed, and it is not the last button, moves focus to the next button.\n            // - If focus is on a button and its dropdown is expanded, moves focus to the first link in the dropdown.\n            // - If focus is on a link, and it is not the last link, moves focus to the next link.\n            preventEvent(event);\n\n            if (\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen\n            ) {\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.focusNextChild();\n            }\n          } else if (key === \"ArrowUp\" || key === \"ArrowLeft\") {\n            // Hitting the Up or Left Arrow:\n            // - If focus is on a button, and it is not the first button, moves focus to the previous button.\n            // - If focus is on a link, and it is not the first link, moves focus to the previous link.\n            preventEvent(event);\n            this.focusPreviousChild();\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - If focus is on a button, and it is not the first button, moves focus to the first button.\n            // - If focus is on a link, and it is not the first link, moves focus to the first link.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - If focus is on a button, and it is not the last button, moves focus to the last button.\n            // - If focus is on a link, and it is not the last link, moves focus to the last link.\n            preventEvent(event);\n            this.focusLastChild();\n          }\n        }\n      }\n    });\n  }\n}\n\nexport default DisclosureMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu Bootstrap4DisclosureMenuToggle */\n\nimport DisclosureMenuItem from \"accessible-menu/src/disclosureMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuItem extends DisclosureMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                              options                         - The options for generating the menu item.\n   * @param {HTMLElement}                         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4DisclosureMenu}            options.parentMenu              - The parent menu.\n   * @param {boolean}                             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4DisclosureMenu|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4DisclosureMenuToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4DisclosureMenu */\n\nimport DisclosureMenuToggle from \"accessible-menu/src/disclosureMenuToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4DisclosureMenu.\n */\nclass Bootstrap4DisclosureMenuToggle extends DisclosureMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}                   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}                   options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4DisclosureMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4DisclosureMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4DisclosureMenuToggle;\n","import DisclosureMenu from \"accessible-menu/src/disclosureMenu.js\";\nimport Bootstrap4DisclosureMenuItem from \"./bootstrap4DisclosureMenuItem.js\";\nimport Bootstrap4DisclosureMenuToggle from \"./bootstrap4DisclosureMenuToggle.js\";\n\n/**\n * An accessible disclosure menu in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/disclosure/disclosure-navigation.html|Example Disclosure for Navigation Menus}\n *\n * @extends DisclosureMenu\n */\nclass Bootstrap4DisclosureMenu extends DisclosureMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4DisclosureMenu}\n   *\n   * @protected\n   */\n  _MenuType = Bootstrap4DisclosureMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuItem}\n   *\n   * @protected\n   */\n  _MenuItemType = Bootstrap4DisclosureMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4DisclosureMenuToggle}\n   *\n   * @protected\n   */\n  _MenuToggleType = Bootstrap4DisclosureMenuToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                          options                              - The options for generating the menu.\n   * @param {HTMLElement}                     options.menuElement                  - The menu element in the DOM.\n   * @param {string}                          [options.menuItemSelector = li]      - The CSS selector string for menu items.\n   * @param {string}                          [options.menuLinkSelector = a]       - The CSS selector string for menu links.\n   * @param {string}                          [options.submenuItemSelector]        - The CSS selector string for menu items containing submenus.\n   * @param {string}                          [options.submenuToggleSelector = a]  - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                          [options.submenuSelector = ul]       - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}              [options.controllerElement = null]   - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}              [options.containerElement = null]    - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}          [options.openClass = show]           - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}          [options.closeClass = collapse]      - The class to apply when a menu is \"closed\".\n   * @param {boolean}                         [options.isTopLevel = false]         - A flag to mark the root menu.\n   * @param {(Bootstrap4DisclosureMenu|null)} [options.parentMenu = null]          - The parent menu to this menu.\n   * @param {string}                          [options.hoverType = off]            - The type of hoverability a menu has.\n   * @param {number}                          [options.hoverDelay = 250]           - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                         [options.optionalKeySupport = false] - A flag to add optional keyboard support (Arrow keys, Home, and End) to the menu.\n   * @param {boolean}                         [options.initialize = true]          - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    optionalKeySupport = false,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      optionalKeySupport,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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\ No newline at end of file
diff --git a/dist/menubar-bs4.esm.js b/dist/menubar-bs4.esm.js
index d463f79..e252d49 100644
--- a/dist/menubar-bs4.esm.js
+++ b/dist/menubar-bs4.esm.js
@@ -155,10 +155,28 @@ function isTag(tagName, elements) {
   }
 }
 
-function _defineProperty$5(obj, key, value) { key = _toPropertyKey$5(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$5(arg) { var key = _toPrimitive$5(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$5(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class BaseMenuToggle {
+  _dom = {
+    toggle: null,
+    parent: null
+  };
+  _elements = {
+    controlledMenu: null,
+    parentMenu: null
+  };
+  _open = false;
+  _expandEvent = new CustomEvent("accessibleMenuExpand", {
+    bubbles: true,
+    detail: {
+      toggle: this
+    }
+  });
+  _collapseEvent = new CustomEvent("accessibleMenuCollapse", {
+    bubbles: true,
+    detail: {
+      toggle: this
+    }
+  });
   constructor(_ref) {
     let {
       menuToggleElement,
@@ -166,27 +184,6 @@ class BaseMenuToggle {
       controlledMenu,
       parentMenu = null
     } = _ref;
-    _defineProperty$5(this, "_dom", {
-      toggle: null,
-      parent: null
-    });
-    _defineProperty$5(this, "_elements", {
-      controlledMenu: null,
-      parentMenu: null
-    });
-    _defineProperty$5(this, "_open", false);
-    _defineProperty$5(this, "_expandEvent", new CustomEvent("accessibleMenuExpand", {
-      bubbles: true,
-      detail: {
-        toggle: this
-      }
-    }));
-    _defineProperty$5(this, "_collapseEvent", new CustomEvent("accessibleMenuCollapse", {
-      bubbles: true,
-      detail: {
-        toggle: this
-      }
-    }));
     this._dom.toggle = menuToggleElement;
     this._dom.parent = parentElement;
     this._elements.controlledMenu = controlledMenu;
@@ -331,10 +328,17 @@ class BaseMenuToggle {
   }
 }
 
-function _defineProperty$4(obj, key, value) { key = _toPropertyKey$4(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$4(arg) { var key = _toPrimitive$4(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$4(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class BaseMenuItem {
+  _dom = {
+    item: null,
+    link: null
+  };
+  _elements = {
+    parentMenu: null,
+    childMenu: null,
+    toggle: null
+  };
+  _submenu = false;
   constructor(_ref) {
     let {
       menuItemElement,
@@ -344,16 +348,6 @@ class BaseMenuItem {
       childMenu = null,
       toggle = null
     } = _ref;
-    _defineProperty$4(this, "_dom", {
-      item: null,
-      link: null
-    });
-    _defineProperty$4(this, "_elements", {
-      parentMenu: null,
-      childMenu: null,
-      toggle: null
-    });
-    _defineProperty$4(this, "_submenu", false);
     this._dom.item = menuItemElement;
     this._dom.link = menuLinkElement;
     this._elements.parentMenu = parentMenu;
@@ -410,10 +404,41 @@ function preventEvent(event) {
   event.stopPropagation();
 }
 
-function _defineProperty$3(obj, key, value) { key = _toPropertyKey$3(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$3(arg) { var key = _toPrimitive$3(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$3(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class BaseMenu {
+  _MenuType = BaseMenu;
+  _MenuItemType = BaseMenuItem;
+  _MenuToggleType = BaseMenuToggle;
+  _dom = {
+    menu: null,
+    menuItems: [],
+    submenuItems: [],
+    submenuToggles: [],
+    submenus: [],
+    controller: null,
+    container: null
+  };
+  _selectors = {
+    menuItems: "",
+    menuLinks: "",
+    submenuItems: "",
+    submenuToggles: "",
+    submenus: ""
+  };
+  _elements = {
+    menuItems: [],
+    submenuToggles: [],
+    controller: null,
+    parentMenu: null,
+    rootMenu: null
+  };
+  _openClass = "show";
+  _closeClass = "hide";
+  _root = true;
+  _currentChild = 0;
+  _focusState = "none";
+  _currentEvent = "none";
+  _hoverType = "off";
+  _hoverDelay = 250;
   constructor(_ref) {
     let {
       menuElement,
@@ -431,40 +456,6 @@ class BaseMenu {
       hoverType = "off",
       hoverDelay = 250
     } = _ref;
-    _defineProperty$3(this, "_MenuType", BaseMenu);
-    _defineProperty$3(this, "_MenuItemType", BaseMenuItem);
-    _defineProperty$3(this, "_MenuToggleType", BaseMenuToggle);
-    _defineProperty$3(this, "_dom", {
-      menu: null,
-      menuItems: [],
-      submenuItems: [],
-      submenuToggles: [],
-      submenus: [],
-      controller: null,
-      container: null
-    });
-    _defineProperty$3(this, "_selectors", {
-      menuItems: "",
-      menuLinks: "",
-      submenuItems: "",
-      submenuToggles: "",
-      submenus: ""
-    });
-    _defineProperty$3(this, "_elements", {
-      menuItems: [],
-      submenuToggles: [],
-      controller: null,
-      parentMenu: null,
-      rootMenu: null
-    });
-    _defineProperty$3(this, "_openClass", "show");
-    _defineProperty$3(this, "_closeClass", "hide");
-    _defineProperty$3(this, "_root", true);
-    _defineProperty$3(this, "_currentChild", 0);
-    _defineProperty$3(this, "_focusState", "none");
-    _defineProperty$3(this, "_currentEvent", "none");
-    _defineProperty$3(this, "_hoverType", "off");
-    _defineProperty$3(this, "_hoverDelay", 250);
     this._dom.menu = menuElement;
     this._dom.controller = controllerElement;
     this._dom.container = containerElement;
@@ -917,8 +908,10 @@ class BaseMenu {
         const key = keyPress(event);
         if (key === "Space" || key === "Enter") {
           preventEvent(event);
-          this.elements.controller.open();
-          this.focusFirstChild();
+          this.elements.controller.toggle();
+          if (this.elements.controller.isOpen) {
+            this.focusFirstChild();
+          }
         }
       });
     }
@@ -1079,10 +1072,10 @@ class MenubarToggle extends BaseMenuToggle {
   }
 }
 
-function _defineProperty$2(obj, key, value) { key = _toPropertyKey$2(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$2(arg) { var key = _toPrimitive$2(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$2(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class Menubar extends BaseMenu {
+  _MenuType = Menubar;
+  _MenuItemType = MenubarItem;
+  _MenuToggleType = MenubarToggle;
   constructor(_ref) {
     let {
       menuElement,
@@ -1117,9 +1110,6 @@ class Menubar extends BaseMenu {
       hoverType,
       hoverDelay
     });
-    _defineProperty$2(this, "_MenuType", Menubar);
-    _defineProperty$2(this, "_MenuItemType", MenubarItem);
-    _defineProperty$2(this, "_MenuToggleType", MenubarToggle);
     if (initialize) {
       this.initialize();
     }
@@ -1127,7 +1117,11 @@ class Menubar extends BaseMenu {
   initialize() {
     try {
       super.initialize();
-      this.dom.menu.setAttribute("role", "menubar");
+      if (this.isTopLevel) {
+        this.dom.menu.setAttribute("role", "menubar");
+      } else {
+        this.dom.menu.setAttribute("role", "menu");
+      }
       this._handleFocus();
       this._handleClick();
       this._handleHover();
@@ -1405,10 +1399,12 @@ class Bootstrap4MenubarItem extends MenubarItem {
   }
 }
 
-function _defineProperty$1(obj, key, value) { key = _toPropertyKey$1(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$1(arg) { var key = _toPrimitive$1(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$1(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class Bootstrap4MenubarToggle extends MenubarToggle {
+  _dom = {
+    toggle: null,
+    parent: null,
+    container: null
+  };
   constructor(_ref) {
     let {
       menuToggleElement,
@@ -1424,11 +1420,6 @@ class Bootstrap4MenubarToggle extends MenubarToggle {
       parentMenu,
       initialize: false
     });
-    _defineProperty$1(this, "_dom", {
-      toggle: null,
-      parent: null,
-      container: null
-    });
     this._dom.toggle = menuToggleElement;
     this._dom.parent = parentElement;
     this._dom.container = controlledMenu.isTopLevel ? controlledMenu.dom.container : controlledMenu.dom.menu;
@@ -1489,10 +1480,10 @@ class Bootstrap4MenubarToggle extends MenubarToggle {
   }
 }
 
-function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class Bootstrap4Menubar extends Menubar {
+  _MenuType = Bootstrap4Menubar;
+  _MenuItemType = Bootstrap4MenubarItem;
+  _MenuToggleType = Bootstrap4MenubarToggle;
   constructor(_ref) {
     let {
       menuElement,
@@ -1528,9 +1519,6 @@ class Bootstrap4Menubar extends Menubar {
       hoverDelay,
       initialize: false
     });
-    _defineProperty(this, "_MenuType", Bootstrap4Menubar);
-    _defineProperty(this, "_MenuItemType", Bootstrap4MenubarItem);
-    _defineProperty(this, "_MenuToggleType", Bootstrap4MenubarToggle);
     if (initialize) {
       this.initialize();
     }
diff --git a/dist/menubar-bs4.esm.js.map b/dist/menubar-bs4.esm.js.map
index f752e53..7293bca 100644
--- a/dist/menubar-bs4.esm.js.map
+++ b/dist/menubar-bs4.esm.js.map
@@ -1 +1 @@
-{"version":3,"file":"menubar-bs4.esm.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/menubarItem.js","../node_modules/accessible-menu/src/menubarToggle.js","../node_modules/accessible-menu/src/menubar.js","../src/bootstrap4MenubarItem.js","../src/bootstrap4MenubarToggle.js","../src/bootstrap4Menubar.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this.dom.menu.setAttribute(\"role\", \"menubar\");\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = 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The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar, MenubarToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      // Set the role of the menu.\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"menubar\");\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"menu\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar Bootstrap4MenubarToggle */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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diff --git a/dist/menubar-bs4.esm.min.js b/dist/menubar-bs4.esm.min.js
index 1600d46..d22df94 100644
--- a/dist/menubar-bs4.esm.min.js
+++ b/dist/menubar-bs4.esm.min.js
@@ -1,2 +1,2 @@
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0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.add(n):this.elements.controlledMenu.dom.menu.classList.add(...n)),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.remove(t):this.elements.controlledMenu.dom.menu.classList.remove(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.add(t):this.elements.controlledMenu.dom.menu.classList.add(...t)),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.remove(n):this.elements.controlledMenu.dom.menu.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}open(){this.elements.controlledMenu.focusState="self",this._expand(),this.isOpen=!0}preview(){this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._expand(),this.isOpen=!0}close(){this.isOpen&&(this.elements.controlledMenu.currentChild=0,this.elements.controlledMenu.blur(),this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._collapse(),this.isOpen=!1)}toggle(){this.isOpen?this.close():this.open()}closeSiblings(){this.elements.parentMenu&&this.elements.parentMenu.elements.submenuToggles.forEach((e=>{e!==this&&e.close()}))}closeChildren(){this.elements.controlledMenu.elements.submenuToggles.forEach((e=>e.close()))}}function l(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:o=null}=e;l(this,"_dom",{item:null,link:null}),l(this,"_elements",{parentMenu:null,childMenu:null,toggle:null}),l(this,"_submenu",!1),this._dom.item=t,this._dom.link=n,this._elements.parentMenu=s,this._elements.childMenu=r,this._elements.toggle=o,this._submenu=i}initialize(){}get dom(){return this._dom}get elements(){return this._elements}get isSubmenuItem(){return this._submenu}focus(){this.elements.parentMenu.shouldFocus&&this.dom.link.focus()}blur(){this.elements.parentMenu.shouldFocus&&this.dom.link.blur()}}function m(e){try{const t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function h(e){e.preventDefault(),e.stopPropagation()}function c(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:i="",submenuToggleSelector:r="a",submenuSelector:l="ul",controllerElement:m=null,containerElement:h=null,openClass:d="show",closeClass:p="hide",isTopLevel:g=!0,parentMenu:f=null,hoverType:b="off",hoverDelay:v=250}=e;c(this,"_MenuType",a),c(this,"_MenuItemType",u),c(this,"_MenuToggleType",o),c(this,"_dom",{menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null}),c(this,"_selectors",{menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""}),c(this,"_elements",{menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null}),c(this,"_openClass","show"),c(this,"_closeClass","hide"),c(this,"_root",!0),c(this,"_currentChild",0),c(this,"_focusState","none"),c(this,"_currentEvent","none"),c(this,"_hoverType","off"),c(this,"_hoverDelay",250),this._dom.menu=t,this._dom.controller=m,this._dom.container=h,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=i,this._selectors.submenuToggles=r,this._selectors.submenus=l,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=f,this._elements.rootMenu=g?this:null,this._openClass=d||"",this._closeClass=p||"",this._root=g,this._hoverType=b,this._hoverDelay=v}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){i({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let r=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(r=!1):e(HTMLElement,{menuElement:this._dom.menu})||(r=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(r=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(r=!1),""===this._openClass||s({openClass:this._openClass})||(r=!1),""===this._closeClass||s({closeClass:this._closeClass})||(r=!1),t("boolean",{isTopLevel:this._root})||(r=!1),null===this._elements.parentMenu||e(a,{parentMenu:this._elements.parentMenu})||(r=!1),i({hoverType:this._hoverType})||(r=!1),t("number",{hoverDelay:this._hoverDelay})||(r=!1),r}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const i=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?i:[...this._dom[t],...i]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),i=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),r=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:i,parentMenu:this});this._elements.submenuToggles.push(r),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:i,toggle:r})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){h(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||h(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||(h(e),this.elements.controller.open(),this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class d extends u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:o=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:o}),l&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","menuitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=0)}blur(){super.blur(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=-1)}}class p extends o{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i}),r&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}function g(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class f extends a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:i="",submenuToggleSelector:r="a",submenuSelector:o="ul",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:b="off",hoverDelay:v=250,initialize:M=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:o,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:b,hoverDelay:v}),g(this,"_MenuType",f),g(this,"_MenuItemType",d),g(this,"_MenuToggleType",p),M&&this.initialize()}initialize(){try{super.initialize(),this.dom.menu.setAttribute("role","menubar"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup(),this.isTopLevel&&(this.elements.menuItems[0].dom.link.tabIndex=0)}catch(e){console.error(e)}}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?(this.elements.rootMenu.blur(),this.elements.rootMenu.closeChildren()):this.elements.rootMenu.focus()),"Character"===t)h(e);else if(this.isTopLevel){if("self"===this.focusState){const n=["Space","Enter","ArrowDown","ArrowUp"],s=["Escape"];(["ArrowRight","ArrowLeft","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&h(e)}}else{const n=["Space","Enter"];(["Escape","ArrowRight","ArrowLeft","ArrowDown","ArrowUp","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t))&&h(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e),{altKey:n,crtlKey:s,metaKey:i}=e;if("Character"!==t||(n||s||i))if(this.isTopLevel){if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click();else if("ArrowRight"===t){h(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusNextChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowLeft"===t){h(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusPreviousChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowDown"===t)this.currentMenuItem.isSubmenuItem&&(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()})));else if("ArrowUp"===t)this.currentMenuItem.isSubmenuItem&&(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusLastChild()})));else if("Home"===t)h(e),this.focusFirstChild();else if("End"===t)h(e),this.focusLastChild();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(h(e),this.closeChildren()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(h(e),this.elements.controller.close(),this.focusController())}}else"Space"===t||"Enter"===t?this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click():"Escape"===t?(h(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusCurrentChild()):"ArrowRight"===t?this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):(h(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusNextChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&this.elements.rootMenu.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?this.elements.parentMenu.currentMenuItem.isSubmenuItem&&(h(e),this.elements.parentMenu.currentMenuItem.elements.toggle.close(),this.elements.parentMenu.focusCurrentChild(),this.elements.parentMenu===this.elements.rootMenu&&(this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusPreviousChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&(this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.elements.rootMenu.currentMenuItem.elements.toggle.preview()))):"ArrowDown"===t?(h(e),this.focusNextChild()):"ArrowUp"===t?(h(e),this.focusPreviousChild()):"Home"===t?(h(e),this.focusFirstChild()):"End"===t&&(h(e),this.focusLastChild());else h(e),this.elements.rootMenu.currentEvent="character",this.focusNextChildWithCharacter(e.key)}))}focusNextChild(){this.currentChild===this.elements.menuItems.length-1?this.focusFirstChild():this.focusChild(this.currentChild+1)}focusPreviousChild(){0===this.currentChild?this.focusLastChild():this.focusChild(this.currentChild-1)}focusNextChildWithCharacter(e){const t=e.toLowerCase();let n=this.currentChild+1,s=!1;for(;!s&&n<this.elements.menuItems.length;){let e="";e=this.elements.menuItems[n].dom.item.innerText?this.elements.menuItems[n].dom.item.innerText:this.elements.menuItems[n].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t&&(s=!0,this.focusChild(n)),n++}}}class b extends d{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:o=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:o,initialize:!1}),l&&this.initialize()}}function v(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class M extends p{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i,initialize:!1}),v(this,"_dom",{toggle:null,parent:null,container:null}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,r&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}function y(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class E extends f{constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:i=".dropdown",submenuToggleSelector:r=".dropdown-toggle",submenuSelector:o=".dropdown-menu",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:o,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),y(this,"_MenuType",E),y(this,"_MenuItemType",b),y(this,"_MenuToggleType",M),g&&this.initialize()}}export{E as default};
+function e(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${typeof t} given.`)}for(const n in t)if(!(t[n]instanceof e)){const s=typeof t[n];throw new TypeError(`AccessibleMenu: ${n} must be an instance of ${e.name}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function t(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Values given to isValidType() must be inside of an object. ${typeof t} given.`)}for(const n in t){const s=typeof t[n];if(s!==e)throw new TypeError(`AccessibleMenu: ${n} must be a ${e}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function n(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${typeof e} given.`)}for(const t in e)try{if(null===e[t])throw new Error;document.querySelector(e[t])}catch(n){throw new TypeError(`AccessibleMenu: ${t} must be a valid CSS selector. "${e[t]}" given.`)}return!0}catch(e){return console.error(e),!1}}function s(e){try{if("object"!=typeof e||Array.isArray(e)){throw new TypeError(`AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${typeof e} given.`)}for(const t in e){const s=typeof e[t];if("string"!==s){if(!Array.isArray(e[t]))throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. ${s} given.`);e[t].forEach((e=>{if("string"!=typeof e)throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. An array containing non-strings given.`)}))}else{const s={};s[t]=e[t],n(s)}}return!0}catch(e){return console.error(e),!1}}function o(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${typeof e} given.`)}const t=["off","on","dynamic"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}class l{_dom={toggle:null,parent:null};_elements={controlledMenu:null,parentMenu:null};_open=!1;_expandEvent=new CustomEvent("accessibleMenuExpand",{bubbles:!0,detail:{toggle:this}});_collapseEvent=new CustomEvent("accessibleMenuCollapse",{bubbles:!0,detail:{toggle:this}});constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null}=e;this._dom.toggle=t,this._dom.parent=n,this._elements.controlledMenu=s,this._elements.parentMenu=o}initialize(){if(this.dom.toggle.setAttribute("aria-haspopup","true"),this.dom.toggle.setAttribute("aria-expanded","false"),function(n,s){if(t("string",{tagName:n})&&e(HTMLElement,s)){const e=n.toLowerCase();let t=!0;for(const n in s)s[n].tagName.toLowerCase()!==e&&(t=!1);return t}return!1}("button",{toggle:this.dom.toggle})||this.dom.toggle.setAttribute("role","button"),""===this.dom.toggle.id||""===this.elements.controlledMenu.dom.menu.id){const e=Math.random().toString(36).replace(/[^a-z]+/g,"").substr(0,10);let t=this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\s]/g,""),n=e;!t.replace(/\s/g,"").length&&this.dom.toggle.getAttribute("aria-label")&&(t=this.dom.toggle.getAttribute("aria-label").replace(/[^a-zA-Z0-9\s]/g,"")),t.replace(/\s/g,"").length>0&&(t=t.toLowerCase().replace(/\s+/g,"-"),t.startsWith("-")&&(t=t.substring(1)),t.endsWith("-")&&(t=t.slice(0,-1)),n=`${t}-${n}`),this.dom.toggle.id=this.dom.toggle.id||`${n}-menu-button`,this.elements.controlledMenu.dom.menu.id=this.elements.controlledMenu.dom.menu.id||`${n}-menu`}this.elements.controlledMenu.dom.menu.setAttribute("aria-labelledby",this.dom.toggle.id),this.dom.toggle.setAttribute("aria-controls",this.elements.controlledMenu.dom.menu.id),this._collapse(!1)}get dom(){return this._dom}get elements(){return this._elements}get isOpen(){return this._open}set isOpen(e){t("boolean",{value:e}),this._open=e}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.add(n):this.elements.controlledMenu.dom.menu.classList.add(...n)),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.remove(t):this.elements.controlledMenu.dom.menu.classList.remove(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.add(t):this.elements.controlledMenu.dom.menu.classList.add(...t)),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.remove(n):this.elements.controlledMenu.dom.menu.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}open(){this.elements.controlledMenu.focusState="self",this._expand(),this.isOpen=!0}preview(){this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._expand(),this.isOpen=!0}close(){this.isOpen&&(this.elements.controlledMenu.currentChild=0,this.elements.controlledMenu.blur(),this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._collapse(),this.isOpen=!1)}toggle(){this.isOpen?this.close():this.open()}closeSiblings(){this.elements.parentMenu&&this.elements.parentMenu.elements.submenuToggles.forEach((e=>{e!==this&&e.close()}))}closeChildren(){this.elements.controlledMenu.elements.submenuToggles.forEach((e=>e.close()))}}class i{_dom={item:null,link:null};_elements={parentMenu:null,childMenu:null,toggle:null};_submenu=!1;constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null}=e;this._dom.item=t,this._dom.link=n,this._elements.parentMenu=s,this._elements.childMenu=l,this._elements.toggle=i,this._submenu=o}initialize(){}get dom(){return this._dom}get elements(){return this._elements}get isSubmenuItem(){return this._submenu}focus(){this.elements.parentMenu.shouldFocus&&this.dom.link.focus()}blur(){this.elements.parentMenu.shouldFocus&&this.dom.link.blur()}}function r(e){try{const t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function u(e){e.preventDefault(),e.stopPropagation()}class m{_MenuType=m;_MenuItemType=i;_MenuToggleType=l;_dom={menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null};_selectors={menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""};_elements={menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null};_openClass="show";_closeClass="hide";_root=!0;_currentChild=0;_focusState="none";_currentEvent="none";_hoverType="off";_hoverDelay=250;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:l="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250}=e;this._dom.menu=t,this._dom.controller=r,this._dom.container=u,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=o,this._selectors.submenuToggles=l,this._selectors.submenus=i,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=a,this._elements.rootMenu=c?this:null,this._openClass=m||"",this._closeClass=h||"",this._root=c,this._hoverType=d,this._hoverDelay=p}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){o({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let l=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(l=!1):e(HTMLElement,{menuElement:this._dom.menu})||(l=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(l=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(l=!1),""===this._openClass||s({openClass:this._openClass})||(l=!1),""===this._closeClass||s({closeClass:this._closeClass})||(l=!1),t("boolean",{isTopLevel:this._root})||(l=!1),null===this._elements.parentMenu||e(m,{parentMenu:this._elements.parentMenu})||(l=!1),o({hoverType:this._hoverType})||(l=!1),t("number",{hoverDelay:this._hoverDelay})||(l=!1),l}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const o=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?o:[...this._dom[t],...o]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),o=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),l=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:o,parentMenu:this});this._elements.submenuToggles.push(l),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:o,toggle:l})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){u(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||u(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||(u(e),this.elements.controller.toggle(),this.elements.controller.isOpen&&this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class h extends i{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:l,toggle:i}),r&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","menuitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=0)}blur(){super.blur(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=-1)}}class c extends l{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:l=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o}),l&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}class a extends m{_MenuType=a;_MenuItemType=h;_MenuToggleType=c;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:l="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:l,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),g&&this.initialize()}initialize(){try{super.initialize(),this.isTopLevel?this.dom.menu.setAttribute("role","menubar"):this.dom.menu.setAttribute("role","menu"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup(),this.isTopLevel&&(this.elements.menuItems[0].dom.link.tabIndex=0)}catch(e){console.error(e)}}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?(this.elements.rootMenu.blur(),this.elements.rootMenu.closeChildren()):this.elements.rootMenu.focus()),"Character"===t)u(e);else if(this.isTopLevel){if("self"===this.focusState){const n=["Space","Enter","ArrowDown","ArrowUp"],s=["Escape"];(["ArrowRight","ArrowLeft","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&u(e)}}else{const n=["Space","Enter"];(["Escape","ArrowRight","ArrowLeft","ArrowDown","ArrowUp","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t))&&u(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e),{altKey:n,crtlKey:s,metaKey:o}=e;if("Character"!==t||(n||s||o))if(this.isTopLevel){if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click();else if("ArrowRight"===t){u(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusNextChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowLeft"===t){u(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusPreviousChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowDown"===t)this.currentMenuItem.isSubmenuItem&&(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()})));else if("ArrowUp"===t)this.currentMenuItem.isSubmenuItem&&(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusLastChild()})));else if("Home"===t)u(e),this.focusFirstChild();else if("End"===t)u(e),this.focusLastChild();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(u(e),this.closeChildren()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(u(e),this.elements.controller.close(),this.focusController())}}else"Space"===t||"Enter"===t?this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click():"Escape"===t?(u(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusCurrentChild()):"ArrowRight"===t?this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):(u(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusNextChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&this.elements.rootMenu.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?this.elements.parentMenu.currentMenuItem.isSubmenuItem&&(u(e),this.elements.parentMenu.currentMenuItem.elements.toggle.close(),this.elements.parentMenu.focusCurrentChild(),this.elements.parentMenu===this.elements.rootMenu&&(this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusPreviousChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&(this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.elements.rootMenu.currentMenuItem.elements.toggle.preview()))):"ArrowDown"===t?(u(e),this.focusNextChild()):"ArrowUp"===t?(u(e),this.focusPreviousChild()):"Home"===t?(u(e),this.focusFirstChild()):"End"===t&&(u(e),this.focusLastChild());else u(e),this.elements.rootMenu.currentEvent="character",this.focusNextChildWithCharacter(e.key)}))}focusNextChild(){this.currentChild===this.elements.menuItems.length-1?this.focusFirstChild():this.focusChild(this.currentChild+1)}focusPreviousChild(){0===this.currentChild?this.focusLastChild():this.focusChild(this.currentChild-1)}focusNextChildWithCharacter(e){const t=e.toLowerCase();let n=this.currentChild+1,s=!1;for(;!s&&n<this.elements.menuItems.length;){let e="";e=this.elements.menuItems[n].dom.item.innerText?this.elements.menuItems[n].dom.item.innerText:this.elements.menuItems[n].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t&&(s=!0,this.focusChild(n)),n++}}}class d extends h{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:l,toggle:i,initialize:!1}),r&&this.initialize()}}class p extends c{_dom={toggle:null,parent:null,container:null};constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:l=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o,initialize:!1}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,l&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}class g extends a{_MenuType=g;_MenuItemType=d;_MenuToggleType=p;constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:o=".dropdown",submenuToggleSelector:l=".dropdown-toggle",submenuSelector:i=".dropdown-menu",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:l,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),g&&this.initialize()}}export{g as default};
 //# sourceMappingURL=menubar-bs4.esm.min.js.map
diff --git a/dist/menubar-bs4.esm.min.js.map b/dist/menubar-bs4.esm.min.js.map
index 0137cc1..015cadf 100644
--- a/dist/menubar-bs4.esm.min.js.map
+++ b/dist/menubar-bs4.esm.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"menubar-bs4.esm.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/menubarItem.js","../node_modules/accessible-menu/src/menubarToggle.js","../node_modules/accessible-menu/src/menubar.js","../src/bootstrap4MenubarItem.js","../src/bootstrap4MenubarToggle.js","../src/bootstrap4Menubar.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this.dom.menu.setAttribute(\"role\", \"menubar\");\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n  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     } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = 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The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar, MenubarToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      // Set the role of the menu.\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"menubar\");\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"menu\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar Bootstrap4MenubarToggle */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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\ No newline at end of file
diff --git a/dist/menubar-bs4.js b/dist/menubar-bs4.js
index 80c9e97..0149d5a 100644
--- a/dist/menubar-bs4.js
+++ b/dist/menubar-bs4.js
@@ -158,10 +158,28 @@ var Bootstrap4Menubar = (function () {
     }
   }
 
-  function _defineProperty$5(obj, key, value) { key = _toPropertyKey$5(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$5(arg) { var key = _toPrimitive$5(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$5(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenuToggle {
+    _dom = {
+      toggle: null,
+      parent: null
+    };
+    _elements = {
+      controlledMenu: null,
+      parentMenu: null
+    };
+    _open = false;
+    _expandEvent = new CustomEvent("accessibleMenuExpand", {
+      bubbles: true,
+      detail: {
+        toggle: this
+      }
+    });
+    _collapseEvent = new CustomEvent("accessibleMenuCollapse", {
+      bubbles: true,
+      detail: {
+        toggle: this
+      }
+    });
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -169,27 +187,6 @@ var Bootstrap4Menubar = (function () {
         controlledMenu,
         parentMenu = null
       } = _ref;
-      _defineProperty$5(this, "_dom", {
-        toggle: null,
-        parent: null
-      });
-      _defineProperty$5(this, "_elements", {
-        controlledMenu: null,
-        parentMenu: null
-      });
-      _defineProperty$5(this, "_open", false);
-      _defineProperty$5(this, "_expandEvent", new CustomEvent("accessibleMenuExpand", {
-        bubbles: true,
-        detail: {
-          toggle: this
-        }
-      }));
-      _defineProperty$5(this, "_collapseEvent", new CustomEvent("accessibleMenuCollapse", {
-        bubbles: true,
-        detail: {
-          toggle: this
-        }
-      }));
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._elements.controlledMenu = controlledMenu;
@@ -334,10 +331,17 @@ var Bootstrap4Menubar = (function () {
     }
   }
 
-  function _defineProperty$4(obj, key, value) { key = _toPropertyKey$4(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$4(arg) { var key = _toPrimitive$4(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$4(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenuItem {
+    _dom = {
+      item: null,
+      link: null
+    };
+    _elements = {
+      parentMenu: null,
+      childMenu: null,
+      toggle: null
+    };
+    _submenu = false;
     constructor(_ref) {
       let {
         menuItemElement,
@@ -347,16 +351,6 @@ var Bootstrap4Menubar = (function () {
         childMenu = null,
         toggle = null
       } = _ref;
-      _defineProperty$4(this, "_dom", {
-        item: null,
-        link: null
-      });
-      _defineProperty$4(this, "_elements", {
-        parentMenu: null,
-        childMenu: null,
-        toggle: null
-      });
-      _defineProperty$4(this, "_submenu", false);
       this._dom.item = menuItemElement;
       this._dom.link = menuLinkElement;
       this._elements.parentMenu = parentMenu;
@@ -413,10 +407,41 @@ var Bootstrap4Menubar = (function () {
     event.stopPropagation();
   }
 
-  function _defineProperty$3(obj, key, value) { key = _toPropertyKey$3(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$3(arg) { var key = _toPrimitive$3(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$3(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenu {
+    _MenuType = BaseMenu;
+    _MenuItemType = BaseMenuItem;
+    _MenuToggleType = BaseMenuToggle;
+    _dom = {
+      menu: null,
+      menuItems: [],
+      submenuItems: [],
+      submenuToggles: [],
+      submenus: [],
+      controller: null,
+      container: null
+    };
+    _selectors = {
+      menuItems: "",
+      menuLinks: "",
+      submenuItems: "",
+      submenuToggles: "",
+      submenus: ""
+    };
+    _elements = {
+      menuItems: [],
+      submenuToggles: [],
+      controller: null,
+      parentMenu: null,
+      rootMenu: null
+    };
+    _openClass = "show";
+    _closeClass = "hide";
+    _root = true;
+    _currentChild = 0;
+    _focusState = "none";
+    _currentEvent = "none";
+    _hoverType = "off";
+    _hoverDelay = 250;
     constructor(_ref) {
       let {
         menuElement,
@@ -434,40 +459,6 @@ var Bootstrap4Menubar = (function () {
         hoverType = "off",
         hoverDelay = 250
       } = _ref;
-      _defineProperty$3(this, "_MenuType", BaseMenu);
-      _defineProperty$3(this, "_MenuItemType", BaseMenuItem);
-      _defineProperty$3(this, "_MenuToggleType", BaseMenuToggle);
-      _defineProperty$3(this, "_dom", {
-        menu: null,
-        menuItems: [],
-        submenuItems: [],
-        submenuToggles: [],
-        submenus: [],
-        controller: null,
-        container: null
-      });
-      _defineProperty$3(this, "_selectors", {
-        menuItems: "",
-        menuLinks: "",
-        submenuItems: "",
-        submenuToggles: "",
-        submenus: ""
-      });
-      _defineProperty$3(this, "_elements", {
-        menuItems: [],
-        submenuToggles: [],
-        controller: null,
-        parentMenu: null,
-        rootMenu: null
-      });
-      _defineProperty$3(this, "_openClass", "show");
-      _defineProperty$3(this, "_closeClass", "hide");
-      _defineProperty$3(this, "_root", true);
-      _defineProperty$3(this, "_currentChild", 0);
-      _defineProperty$3(this, "_focusState", "none");
-      _defineProperty$3(this, "_currentEvent", "none");
-      _defineProperty$3(this, "_hoverType", "off");
-      _defineProperty$3(this, "_hoverDelay", 250);
       this._dom.menu = menuElement;
       this._dom.controller = controllerElement;
       this._dom.container = containerElement;
@@ -920,8 +911,10 @@ var Bootstrap4Menubar = (function () {
           const key = keyPress(event);
           if (key === "Space" || key === "Enter") {
             preventEvent(event);
-            this.elements.controller.open();
-            this.focusFirstChild();
+            this.elements.controller.toggle();
+            if (this.elements.controller.isOpen) {
+              this.focusFirstChild();
+            }
           }
         });
       }
@@ -1082,10 +1075,10 @@ var Bootstrap4Menubar = (function () {
     }
   }
 
-  function _defineProperty$2(obj, key, value) { key = _toPropertyKey$2(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$2(arg) { var key = _toPrimitive$2(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$2(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Menubar extends BaseMenu {
+    _MenuType = Menubar;
+    _MenuItemType = MenubarItem;
+    _MenuToggleType = MenubarToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -1120,9 +1113,6 @@ var Bootstrap4Menubar = (function () {
         hoverType,
         hoverDelay
       });
-      _defineProperty$2(this, "_MenuType", Menubar);
-      _defineProperty$2(this, "_MenuItemType", MenubarItem);
-      _defineProperty$2(this, "_MenuToggleType", MenubarToggle);
       if (initialize) {
         this.initialize();
       }
@@ -1130,7 +1120,11 @@ var Bootstrap4Menubar = (function () {
     initialize() {
       try {
         super.initialize();
-        this.dom.menu.setAttribute("role", "menubar");
+        if (this.isTopLevel) {
+          this.dom.menu.setAttribute("role", "menubar");
+        } else {
+          this.dom.menu.setAttribute("role", "menu");
+        }
         this._handleFocus();
         this._handleClick();
         this._handleHover();
@@ -1408,10 +1402,12 @@ var Bootstrap4Menubar = (function () {
     }
   }
 
-  function _defineProperty$1(obj, key, value) { key = _toPropertyKey$1(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$1(arg) { var key = _toPrimitive$1(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$1(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4MenubarToggle extends MenubarToggle {
+    _dom = {
+      toggle: null,
+      parent: null,
+      container: null
+    };
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -1427,11 +1423,6 @@ var Bootstrap4Menubar = (function () {
         parentMenu,
         initialize: false
       });
-      _defineProperty$1(this, "_dom", {
-        toggle: null,
-        parent: null,
-        container: null
-      });
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._dom.container = controlledMenu.isTopLevel ? controlledMenu.dom.container : controlledMenu.dom.menu;
@@ -1492,10 +1483,10 @@ var Bootstrap4Menubar = (function () {
     }
   }
 
-  function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4Menubar extends Menubar {
+    _MenuType = Bootstrap4Menubar;
+    _MenuItemType = Bootstrap4MenubarItem;
+    _MenuToggleType = Bootstrap4MenubarToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -1531,9 +1522,6 @@ var Bootstrap4Menubar = (function () {
         hoverDelay,
         initialize: false
       });
-      _defineProperty(this, "_MenuType", Bootstrap4Menubar);
-      _defineProperty(this, "_MenuItemType", Bootstrap4MenubarItem);
-      _defineProperty(this, "_MenuToggleType", Bootstrap4MenubarToggle);
       if (initialize) {
         this.initialize();
       }
diff --git a/dist/menubar-bs4.js.map b/dist/menubar-bs4.js.map
index 9f26244..fff1d5f 100644
--- a/dist/menubar-bs4.js.map
+++ b/dist/menubar-bs4.js.map
@@ -1 +1 @@
-{"version":3,"file":"menubar-bs4.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/menubarItem.js","../node_modules/accessible-menu/src/menubarToggle.js","../node_modules/accessible-menu/src/menubar.js","../src/bootstrap4MenubarItem.js","../src/bootstrap4MenubarToggle.js","../src/bootstrap4Menubar.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this.dom.menu.setAttribute(\"role\", \"menubar\");\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = 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The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar, MenubarToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      // Set the role of the menu.\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"menubar\");\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"menu\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar Bootstrap4MenubarToggle */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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diff --git a/dist/menubar-bs4.min.js b/dist/menubar-bs4.min.js
index 98bae4b..82874a7 100644
--- a/dist/menubar-bs4.min.js
+++ b/dist/menubar-bs4.min.js
@@ -1,2 +1,2 @@
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t=this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\s]/g,""),n=e;!t.replace(/\s/g,"").length&&this.dom.toggle.getAttribute("aria-label")&&(t=this.dom.toggle.getAttribute("aria-label").replace(/[^a-zA-Z0-9\s]/g,"")),t.replace(/\s/g,"").length>0&&(t=t.toLowerCase().replace(/\s+/g,"-"),t.startsWith("-")&&(t=t.substring(1)),t.endsWith("-")&&(t=t.slice(0,-1)),n=`${t}-${n}`),this.dom.toggle.id=this.dom.toggle.id||`${n}-menu-button`,this.elements.controlledMenu.dom.menu.id=this.elements.controlledMenu.dom.menu.id||`${n}-menu`}this.elements.controlledMenu.dom.menu.setAttribute("aria-labelledby",this.dom.toggle.id),this.dom.toggle.setAttribute("aria-controls",this.elements.controlledMenu.dom.menu.id),this._collapse(!1)}get dom(){return this._dom}get elements(){return this._elements}get isOpen(){return this._open}set isOpen(e){t("boolean",{value:e}),this._open=e}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.add(n):this.elements.controlledMenu.dom.menu.classList.add(...n)),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.remove(t):this.elements.controlledMenu.dom.menu.classList.remove(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.add(t):this.elements.controlledMenu.dom.menu.classList.add(...t)),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.remove(n):this.elements.controlledMenu.dom.menu.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}open(){this.elements.controlledMenu.focusState="self",this._expand(),this.isOpen=!0}preview(){this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._expand(),this.isOpen=!0}close(){this.isOpen&&(this.elements.controlledMenu.currentChild=0,this.elements.controlledMenu.blur(),this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._collapse(),this.isOpen=!1)}toggle(){this.isOpen?this.close():this.open()}closeSiblings(){this.elements.parentMenu&&this.elements.parentMenu.elements.submenuToggles.forEach((e=>{e!==this&&e.close()}))}closeChildren(){this.elements.controlledMenu.elements.submenuToggles.forEach((e=>e.close()))}}function l(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:o=null}=e;l(this,"_dom",{item:null,link:null}),l(this,"_elements",{parentMenu:null,childMenu:null,toggle:null}),l(this,"_submenu",!1),this._dom.item=t,this._dom.link=n,this._elements.parentMenu=s,this._elements.childMenu=r,this._elements.toggle=o,this._submenu=i}initialize(){}get dom(){return this._dom}get elements(){return this._elements}get isSubmenuItem(){return this._submenu}focus(){this.elements.parentMenu.shouldFocus&&this.dom.link.focus()}blur(){this.elements.parentMenu.shouldFocus&&this.dom.link.blur()}}function m(e){try{const t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function h(e){e.preventDefault(),e.stopPropagation()}function c(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:i="",submenuToggleSelector:r="a",submenuSelector:l="ul",controllerElement:m=null,containerElement:h=null,openClass:d="show",closeClass:p="hide",isTopLevel:g=!0,parentMenu:f=null,hoverType:b="off",hoverDelay:v=250}=e;c(this,"_MenuType",a),c(this,"_MenuItemType",u),c(this,"_MenuToggleType",o),c(this,"_dom",{menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null}),c(this,"_selectors",{menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""}),c(this,"_elements",{menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null}),c(this,"_openClass","show"),c(this,"_closeClass","hide"),c(this,"_root",!0),c(this,"_currentChild",0),c(this,"_focusState","none"),c(this,"_currentEvent","none"),c(this,"_hoverType","off"),c(this,"_hoverDelay",250),this._dom.menu=t,this._dom.controller=m,this._dom.container=h,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=i,this._selectors.submenuToggles=r,this._selectors.submenus=l,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=f,this._elements.rootMenu=g?this:null,this._openClass=d||"",this._closeClass=p||"",this._root=g,this._hoverType=b,this._hoverDelay=v}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){i({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let r=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(r=!1):e(HTMLElement,{menuElement:this._dom.menu})||(r=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(r=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(r=!1),""===this._openClass||s({openClass:this._openClass})||(r=!1),""===this._closeClass||s({closeClass:this._closeClass})||(r=!1),t("boolean",{isTopLevel:this._root})||(r=!1),null===this._elements.parentMenu||e(a,{parentMenu:this._elements.parentMenu})||(r=!1),i({hoverType:this._hoverType})||(r=!1),t("number",{hoverDelay:this._hoverDelay})||(r=!1),r}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const i=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?i:[...this._dom[t],...i]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),i=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),r=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:i,parentMenu:this});this._elements.submenuToggles.push(r),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:i,toggle:r})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){h(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||h(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||(h(e),this.elements.controller.open(),this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class d extends u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:o=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:o}),l&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","menuitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=0)}blur(){super.blur(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=-1)}}class p extends o{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i}),r&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}function g(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class f extends a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:i="",submenuToggleSelector:r="a",submenuSelector:o="ul",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:b="off",hoverDelay:v=250,initialize:M=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:o,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:b,hoverDelay:v}),g(this,"_MenuType",f),g(this,"_MenuItemType",d),g(this,"_MenuToggleType",p),M&&this.initialize()}initialize(){try{super.initialize(),this.dom.menu.setAttribute("role","menubar"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup(),this.isTopLevel&&(this.elements.menuItems[0].dom.link.tabIndex=0)}catch(e){console.error(e)}}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?(this.elements.rootMenu.blur(),this.elements.rootMenu.closeChildren()):this.elements.rootMenu.focus()),"Character"===t)h(e);else if(this.isTopLevel){if("self"===this.focusState){const n=["Space","Enter","ArrowDown","ArrowUp"],s=["Escape"];(["ArrowRight","ArrowLeft","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&h(e)}}else{const n=["Space","Enter"];(["Escape","ArrowRight","ArrowLeft","ArrowDown","ArrowUp","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t))&&h(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e),{altKey:n,crtlKey:s,metaKey:i}=e;if("Character"!==t||(n||s||i))if(this.isTopLevel){if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click();else if("ArrowRight"===t){h(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusNextChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowLeft"===t){h(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusPreviousChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowDown"===t)this.currentMenuItem.isSubmenuItem&&(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()})));else if("ArrowUp"===t)this.currentMenuItem.isSubmenuItem&&(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusLastChild()})));else if("Home"===t)h(e),this.focusFirstChild();else if("End"===t)h(e),this.focusLastChild();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(h(e),this.closeChildren()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(h(e),this.elements.controller.close(),this.focusController())}}else"Space"===t||"Enter"===t?this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click():"Escape"===t?(h(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusCurrentChild()):"ArrowRight"===t?this.currentMenuItem.isSubmenuItem?(h(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):(h(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusNextChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&this.elements.rootMenu.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?this.elements.parentMenu.currentMenuItem.isSubmenuItem&&(h(e),this.elements.parentMenu.currentMenuItem.elements.toggle.close(),this.elements.parentMenu.focusCurrentChild(),this.elements.parentMenu===this.elements.rootMenu&&(this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusPreviousChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&(this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.elements.rootMenu.currentMenuItem.elements.toggle.preview()))):"ArrowDown"===t?(h(e),this.focusNextChild()):"ArrowUp"===t?(h(e),this.focusPreviousChild()):"Home"===t?(h(e),this.focusFirstChild()):"End"===t&&(h(e),this.focusLastChild());else h(e),this.elements.rootMenu.currentEvent="character",this.focusNextChildWithCharacter(e.key)}))}focusNextChild(){this.currentChild===this.elements.menuItems.length-1?this.focusFirstChild():this.focusChild(this.currentChild+1)}focusPreviousChild(){0===this.currentChild?this.focusLastChild():this.focusChild(this.currentChild-1)}focusNextChildWithCharacter(e){const t=e.toLowerCase();let n=this.currentChild+1,s=!1;for(;!s&&n<this.elements.menuItems.length;){let e="";e=this.elements.menuItems[n].dom.item.innerText?this.elements.menuItems[n].dom.item.innerText:this.elements.menuItems[n].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t&&(s=!0,this.focusChild(n)),n++}}}class b extends d{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i=!1,childMenu:r=null,toggle:o=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:i,childMenu:r,toggle:o,initialize:!1}),l&&this.initialize()}}function v(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class M extends p{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i=null,initialize:r=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:i,initialize:!1}),v(this,"_dom",{toggle:null,parent:null,container:null}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,r&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}function y(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class E extends f{constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:i=".dropdown",submenuToggleSelector:r=".dropdown-toggle",submenuSelector:o=".dropdown-menu",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:i,submenuToggleSelector:r,submenuSelector:o,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),y(this,"_MenuType",E),y(this,"_MenuItemType",b),y(this,"_MenuToggleType",M),g&&this.initialize()}}return E}();
+var Bootstrap4Menubar=function(){"use strict";function e(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${typeof t} given.`)}for(const n in t)if(!(t[n]instanceof e)){const s=typeof t[n];throw new TypeError(`AccessibleMenu: ${n} must be an instance of ${e.name}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function t(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Values given to isValidType() must be inside of an object. ${typeof t} given.`)}for(const n in t){const s=typeof t[n];if(s!==e)throw new TypeError(`AccessibleMenu: ${n} must be a ${e}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function n(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${typeof e} given.`)}for(const t in e)try{if(null===e[t])throw new Error;document.querySelector(e[t])}catch(n){throw new TypeError(`AccessibleMenu: ${t} must be a valid CSS selector. "${e[t]}" given.`)}return!0}catch(e){return console.error(e),!1}}function s(e){try{if("object"!=typeof e||Array.isArray(e)){throw new TypeError(`AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${typeof e} given.`)}for(const t in e){const s=typeof e[t];if("string"!==s){if(!Array.isArray(e[t]))throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. ${s} given.`);e[t].forEach((e=>{if("string"!=typeof e)throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. An array containing non-strings given.`)}))}else{const s={};s[t]=e[t],n(s)}}return!0}catch(e){return console.error(e),!1}}function o(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${typeof e} given.`)}const t=["off","on","dynamic"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}class l{_dom={toggle:null,parent:null};_elements={controlledMenu:null,parentMenu:null};_open=!1;_expandEvent=new CustomEvent("accessibleMenuExpand",{bubbles:!0,detail:{toggle:this}});_collapseEvent=new CustomEvent("accessibleMenuCollapse",{bubbles:!0,detail:{toggle:this}});constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null}=e;this._dom.toggle=t,this._dom.parent=n,this._elements.controlledMenu=s,this._elements.parentMenu=o}initialize(){if(this.dom.toggle.setAttribute("aria-haspopup","true"),this.dom.toggle.setAttribute("aria-expanded","false"),function(n,s){if(t("string",{tagName:n})&&e(HTMLElement,s)){const e=n.toLowerCase();let t=!0;for(const n in s)s[n].tagName.toLowerCase()!==e&&(t=!1);return t}return!1}("button",{toggle:this.dom.toggle})||this.dom.toggle.setAttribute("role","button"),""===this.dom.toggle.id||""===this.elements.controlledMenu.dom.menu.id){const e=Math.random().toString(36).replace(/[^a-z]+/g,"").substr(0,10);let t=this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\s]/g,""),n=e;!t.replace(/\s/g,"").length&&this.dom.toggle.getAttribute("aria-label")&&(t=this.dom.toggle.getAttribute("aria-label").replace(/[^a-zA-Z0-9\s]/g,"")),t.replace(/\s/g,"").length>0&&(t=t.toLowerCase().replace(/\s+/g,"-"),t.startsWith("-")&&(t=t.substring(1)),t.endsWith("-")&&(t=t.slice(0,-1)),n=`${t}-${n}`),this.dom.toggle.id=this.dom.toggle.id||`${n}-menu-button`,this.elements.controlledMenu.dom.menu.id=this.elements.controlledMenu.dom.menu.id||`${n}-menu`}this.elements.controlledMenu.dom.menu.setAttribute("aria-labelledby",this.dom.toggle.id),this.dom.toggle.setAttribute("aria-controls",this.elements.controlledMenu.dom.menu.id),this._collapse(!1)}get dom(){return this._dom}get elements(){return this._elements}get isOpen(){return this._open}set isOpen(e){t("boolean",{value:e}),this._open=e}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.add(n):this.elements.controlledMenu.dom.menu.classList.add(...n)),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.remove(t):this.elements.controlledMenu.dom.menu.classList.remove(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.add(t):this.elements.controlledMenu.dom.menu.classList.add(...t)),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.remove(n):this.elements.controlledMenu.dom.menu.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}open(){this.elements.controlledMenu.focusState="self",this._expand(),this.isOpen=!0}preview(){this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._expand(),this.isOpen=!0}close(){this.isOpen&&(this.elements.controlledMenu.currentChild=0,this.elements.controlledMenu.blur(),this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._collapse(),this.isOpen=!1)}toggle(){this.isOpen?this.close():this.open()}closeSiblings(){this.elements.parentMenu&&this.elements.parentMenu.elements.submenuToggles.forEach((e=>{e!==this&&e.close()}))}closeChildren(){this.elements.controlledMenu.elements.submenuToggles.forEach((e=>e.close()))}}class i{_dom={item:null,link:null};_elements={parentMenu:null,childMenu:null,toggle:null};_submenu=!1;constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null}=e;this._dom.item=t,this._dom.link=n,this._elements.parentMenu=s,this._elements.childMenu=l,this._elements.toggle=i,this._submenu=o}initialize(){}get dom(){return this._dom}get elements(){return this._elements}get isSubmenuItem(){return this._submenu}focus(){this.elements.parentMenu.shouldFocus&&this.dom.link.focus()}blur(){this.elements.parentMenu.shouldFocus&&this.dom.link.blur()}}function r(e){try{const t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function u(e){e.preventDefault(),e.stopPropagation()}class m{_MenuType=m;_MenuItemType=i;_MenuToggleType=l;_dom={menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null};_selectors={menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""};_elements={menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null};_openClass="show";_closeClass="hide";_root=!0;_currentChild=0;_focusState="none";_currentEvent="none";_hoverType="off";_hoverDelay=250;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:l="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250}=e;this._dom.menu=t,this._dom.controller=r,this._dom.container=u,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=o,this._selectors.submenuToggles=l,this._selectors.submenus=i,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=a,this._elements.rootMenu=c?this:null,this._openClass=m||"",this._closeClass=h||"",this._root=c,this._hoverType=d,this._hoverDelay=p}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){o({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let l=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(l=!1):e(HTMLElement,{menuElement:this._dom.menu})||(l=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(l=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(l=!1),""===this._openClass||s({openClass:this._openClass})||(l=!1),""===this._closeClass||s({closeClass:this._closeClass})||(l=!1),t("boolean",{isTopLevel:this._root})||(l=!1),null===this._elements.parentMenu||e(m,{parentMenu:this._elements.parentMenu})||(l=!1),o({hoverType:this._hoverType})||(l=!1),t("number",{hoverDelay:this._hoverDelay})||(l=!1),l}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const o=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?o:[...this._dom[t],...o]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),o=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),l=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:o,parentMenu:this});this._elements.submenuToggles.push(l),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:o,toggle:l})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){u(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||u(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||(u(e),this.elements.controller.toggle(),this.elements.controller.isOpen&&this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class h extends i{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:l,toggle:i}),r&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","menuitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=0)}blur(){super.blur(),this.elements.parentMenu.isTopLevel&&(this.dom.link.tabIndex=-1)}}class c extends l{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:l=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o}),l&&this.initialize()}open(){this.closeSiblings(),super.open()}preview(){this.closeSiblings(),super.preview()}close(){this.isOpen&&this.closeChildren(),super.close()}}class a extends m{_MenuType=a;_MenuItemType=h;_MenuToggleType=c;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:o="",submenuToggleSelector:l="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:l,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),g&&this.initialize()}initialize(){try{super.initialize(),this.isTopLevel?this.dom.menu.setAttribute("role","menubar"):this.dom.menu.setAttribute("role","menu"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup(),this.isTopLevel&&(this.elements.menuItems[0].dom.link.tabIndex=0)}catch(e){console.error(e)}}_handleClick(){super._handleClick(),document.addEventListener("pointerup",(e=>{"none"!==this.focusState&&(this.currentEvent="mouse",this.dom.menu.contains(e.target)||!this.dom.menu===e.target||(this.closeChildren(),this.blur(),this.elements.controller&&this.elements.controller.close()))}))}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?(this.elements.rootMenu.blur(),this.elements.rootMenu.closeChildren()):this.elements.rootMenu.focus()),"Character"===t)u(e);else if(this.isTopLevel){if("self"===this.focusState){const n=["Space","Enter","ArrowDown","ArrowUp"],s=["Escape"];(["ArrowRight","ArrowLeft","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&u(e)}}else{const n=["Space","Enter"];(["Escape","ArrowRight","ArrowLeft","ArrowDown","ArrowUp","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t))&&u(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e),{altKey:n,crtlKey:s,metaKey:o}=e;if("Character"!==t||(n||s||o))if(this.isTopLevel){if("self"===this.focusState)if("Space"===t||"Enter"===t)this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click();else if("ArrowRight"===t){u(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusNextChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowLeft"===t){u(e);const t=this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen;this.focusPreviousChild(),t&&(this.currentMenuItem.isSubmenuItem?(this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.preview()):this.closeChildren())}else if("ArrowDown"===t)this.currentMenuItem.isSubmenuItem&&(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()})));else if("ArrowUp"===t)this.currentMenuItem.isSubmenuItem&&(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusLastChild()})));else if("Home"===t)u(e),this.focusFirstChild();else if("End"===t)u(e),this.focusLastChild();else if("Escape"===t){this.elements.submenuToggles.some((e=>e.isOpen))?(u(e),this.closeChildren()):this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(u(e),this.elements.controller.close(),this.focusController())}}else"Space"===t||"Enter"===t?this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):this.currentMenuItem.dom.link.click():"Escape"===t?(u(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusCurrentChild()):"ArrowRight"===t?this.currentMenuItem.isSubmenuItem?(u(e),this.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.currentMenuItem.elements.toggle.open(),requestAnimationFrame((()=>{this.currentMenuItem.elements.childMenu.focusFirstChild()}))):(u(e),this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusNextChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&this.elements.rootMenu.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?this.elements.parentMenu.currentMenuItem.isSubmenuItem&&(u(e),this.elements.parentMenu.currentMenuItem.elements.toggle.close(),this.elements.parentMenu.focusCurrentChild(),this.elements.parentMenu===this.elements.rootMenu&&(this.elements.rootMenu.closeChildren(),this.elements.rootMenu.focusPreviousChild(),this.elements.rootMenu.currentMenuItem.isSubmenuItem&&(this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent="keyboard",this.elements.rootMenu.currentMenuItem.elements.toggle.preview()))):"ArrowDown"===t?(u(e),this.focusNextChild()):"ArrowUp"===t?(u(e),this.focusPreviousChild()):"Home"===t?(u(e),this.focusFirstChild()):"End"===t&&(u(e),this.focusLastChild());else u(e),this.elements.rootMenu.currentEvent="character",this.focusNextChildWithCharacter(e.key)}))}focusNextChild(){this.currentChild===this.elements.menuItems.length-1?this.focusFirstChild():this.focusChild(this.currentChild+1)}focusPreviousChild(){0===this.currentChild?this.focusLastChild():this.focusChild(this.currentChild-1)}focusNextChildWithCharacter(e){const t=e.toLowerCase();let n=this.currentChild+1,s=!1;for(;!s&&n<this.elements.menuItems.length;){let e="";e=this.elements.menuItems[n].dom.item.innerText?this.elements.menuItems[n].dom.item.innerText:this.elements.menuItems[n].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t&&(s=!0,this.focusChild(n)),n++}}}class d extends h{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o=!1,childMenu:l=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:o,childMenu:l,toggle:i,initialize:!1}),r&&this.initialize()}}class p extends c{_dom={toggle:null,parent:null,container:null};constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o=null,initialize:l=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:o,initialize:!1}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,l&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}class g extends a{_MenuType=g;_MenuItemType=d;_MenuToggleType=p;constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:o=".dropdown",submenuToggleSelector:l=".dropdown-toggle",submenuSelector:i=".dropdown-menu",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:o,submenuToggleSelector:l,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),g&&this.initialize()}}return g}();
 //# sourceMappingURL=menubar-bs4.min.js.map
diff --git a/dist/menubar-bs4.min.js.map b/dist/menubar-bs4.min.js.map
index d36493b..9e7fa9e 100644
--- a/dist/menubar-bs4.min.js.map
+++ b/dist/menubar-bs4.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"menubar-bs4.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/menubarItem.js","../node_modules/accessible-menu/src/menubarToggle.js","../node_modules/accessible-menu/src/menubar.js","../src/bootstrap4MenubarItem.js","../src/bootstrap4MenubarToggle.js","../src/bootstrap4Menubar.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      this.dom.menu.setAttribute(\"role\", \"menubar\");\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar, MenubarToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Menubar}.\n *\n * @extends BaseMenuItem\n */\nclass MenubarItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}             options                         - The options for generating the menu item.\n   * @param {HTMLElement}        options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}        options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}            [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}            [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"menuitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"menuitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0 if the parent menu\n   * is the root menu.\n   */\n  focus() {\n    super.focus();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = 0;\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1 if the parent menu\n   * is the root menu.\n   */\n  blur() {\n    super.blur();\n\n    if (this.elements.parentMenu.isTopLevel) {\n      this.dom.link.tabIndex = -1;\n    }\n  }\n}\n\nexport default MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Menubar */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Menubar}.\n *\n * @extends BaseMenuToggle\n */\nclass MenubarToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}       options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}  options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}  options.parentElement       - The element containing the controlled menu.\n   * @param {Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}      [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#open|BaseMenuToggle's open method}.\n   */\n  open() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.open();\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Calls the {@link MenubarToggle#closeSiblings| closeSiblings method}\n   * and _then_ {@link BaseMenuToggle#preview|BaseMenuToggle's preview method}.\n   */\n  preview() {\n    // Close all siblings.\n    this.closeSiblings();\n\n    super.preview();\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Calls the {@link MenubarToggle#closeChildren| closeChildren method}\n   * and _then_ {@link BaseMenuToggle#close|BaseMenuToggle's close method}.\n   */\n  close() {\n    if (this.isOpen) {\n      // Close all children.\n      this.closeChildren();\n    }\n\n    super.close();\n  }\n}\n\nexport default MenubarToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport MenubarItem from \"./menubarItem.js\";\nimport MenubarToggle from \"./menubarToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html|Navigation Menubar Example}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Menubar } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Menubar({\n *   menuElement,\n * });\n */\nclass Menubar extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Menubar}\n   */\n  _MenuType = Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarItem}\n   */\n  _MenuItemType = MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof MenubarToggle}\n   */\n  _MenuToggleType = MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Menubar|null)}         [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Menubar#_handleFocus|focus},\n   * {@link Menubar#_handleClick|click},\n   * {@link Menubar#_handleHover|hover},\n   * {@link Menubar#_handleKeydown|keydown}, and\n   * {@link Menubar#_handleKeyup|keyup} events for the menu.\n   *\n   * This will also set the menu's `role` to \"menubar\" in the DOM.\n   *\n   * If the menu is a root menu the first menu item's `tabIndex` will be set to\n   * 0 in the DOM.\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      // Set the role of the menu.\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"menubar\");\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"menu\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n\n      if (this.isTopLevel) {\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      }\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds all event listeners listed in\n   *   {@link BaseMenu#_handleClick|BaseMenu's _handleClick method}, and\n   * - adds a `pointerup` listener to the `document` so if the user\n   *   clicks outside of the menu it will close if it is open.\n   *\n   * @protected\n   */\n  _handleClick() {\n    super._handleClick();\n\n    // Close the menu if a click event happens outside of it.\n    document.addEventListener(\"pointerup\", (event) => {\n      if (this.focusState !== \"none\") {\n        this.currentEvent = \"mouse\";\n\n        if (\n          !this.dom.menu.contains(event.target) &&\n          !this.dom.menu !== event.target\n        ) {\n          this.closeChildren();\n          this.blur();\n\n          if (this.elements.controller) {\n            this.elements.controller.close();\n          }\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Menubar#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     and \"A\" through \"Z\".\n   *   - Completely closes the menu and moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n          this.elements.rootMenu.closeChildren();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      // Prevent default event actions if we're handling the keyup event.\n      if (key === \"Character\") {\n        preventEvent(event);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          const keys = [\"ArrowRight\", \"ArrowLeft\", \"Home\", \"End\"];\n          const submenuKeys = [\"Space\", \"Enter\", \"ArrowDown\", \"ArrowUp\"];\n          const controllerKeys = [\"Escape\"];\n\n          if (keys.includes(key)) {\n            preventEvent(event);\n          } else if (\n            this.currentMenuItem.isSubmenuItem &&\n            submenuKeys.includes(key)\n          ) {\n            preventEvent(event);\n          } else if (this.elements.controller && controllerKeys.includes(key)) {\n            preventEvent(event);\n          }\n        }\n      } else {\n        const keys = [\n          \"Escape\",\n          \"ArrowRight\",\n          \"ArrowLeft\",\n          \"ArrowDown\",\n          \"ArrowUp\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Space\", \"Enter\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/menubar/menubar-1/menubar-1.html#kbd_label|Navigation Menubar Example}):\n   *\n   * <strong>Menubar</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Right Arrow_ | <ul><li>Moves focus to the next item in the menubar.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Left Arrow_ | <ul><li>Moves focus to the previous item in the menubar.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | _Down Arrow_ | Opens submenu and moves focus to first item in the submenu. |\n   * | _Up Arrow_ | Opens submenu and moves focus to last item in the submenu. |\n   * | _Home_ | Moves focus to first item in the menubar. |\n   * | _End_ | Moves focus to last item in the menubar. |\n   * | _Character_ | <ul><li>Moves focus to next item in the menubar having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * <strong>Submenu</strong>\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Space_ or _Enter_ | <ul><li>Activates menu item, causing the link to be activated.</li><li>NOTE: the links go to dummy pages; use the browser go-back function to return to this menubar example page.</li></ul> |\n   * | _Escape_ | <ul><li>Closes submenu.</li><li>Moves focus to parent menubar item.</li></ul> |\n   * | _Right Arrow_ | <ul><li>If focus is on an item with a submenu, opens the submenu and places focus on the first item.</li><li>If focus is on an item that does not have a submenu:<ul><li>Closes submenu.</li><li>Moves focus to next item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Left Arrow_ | <ul><li>Closes submenu and moves focus to parent menu item.</li><li>If parent menu item is in the menubar, also:<ul><li>moves focus to previous item in the menubar.</li><li>Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.</li></ul></li></ul> |\n   * | _Down Arrow_ | <ul><li>Moves focus to the next item in the submenu.</li><li>If focus is on the last item, moves focus to the first item.</li></ul> |\n   * | _Up Arrow_ | <ul><li>Moves focus to previous item in the submenu.</li><li>If focus is on the first item, moves focus to the last item.</li></ul> |\n   * | Home | Moves focus to the first item in the submenu. |\n   * | End | Moves focus to the last item in the submenu. |\n   * | _Character_ | <ul><li>Moves focus to the next item having a name that starts with the typed character.</li><li>If none of the items have a name starting with the typed character, focus does not move.</li></ul> |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Moves focus to next item in the menubar having a name that starts with the typed character.\n        // - If none of the items have a name starting with the typed character, focus does not move.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextChildWithCharacter(event.key);\n      } else if (this.isTopLevel) {\n        if (this.focusState === \"self\") {\n          if (key === \"Space\" || key === \"Enter\") {\n            // Hitting Space or Enter:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            } else {\n              this.currentMenuItem.dom.link.click();\n            }\n          } else if (key === \"ArrowRight\") {\n            // Hitting the Right Arrow:\n            // - Moves focus to the next item in the menubar.\n            // - If focus is on the last item, moves focus to the first item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusNextChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowLeft\") {\n            // Hitting the Left Arrow:\n            // - Moves focus to the previous item in the menubar.\n            // - If focus is on the first item, moves focus to the last item.\n            // - If focus was on an open submenu and the newly focussed item has a submenu, open the submenu.\n            preventEvent(event);\n\n            // Store the current item's info if its an open dropdown.\n            const previousChildOpen =\n              this.currentMenuItem.isSubmenuItem &&\n              this.currentMenuItem.elements.toggle.isOpen;\n\n            this.focusPreviousChild();\n\n            // Open the newly focussed submenu if applicable.\n            if (previousChildOpen) {\n              if (this.currentMenuItem.isSubmenuItem) {\n                this.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.currentMenuItem.elements.toggle.preview();\n              } else {\n                this.closeChildren();\n              }\n            }\n          } else if (key === \"ArrowDown\") {\n            // Hitting the Down Arrow:\n            // - Opens submenu and moves focus to first item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusFirstChild();\n              });\n            }\n          } else if (key === \"ArrowUp\") {\n            // Hitting the Up Arrow:\n            // - Opens submenu and moves focus to last item in the submenu.\n            if (this.currentMenuItem.isSubmenuItem) {\n              preventEvent(event);\n              this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n              this.currentMenuItem.elements.toggle.open();\n              // This ensures the the menu is _visually_ open before the child is focussed.\n              requestAnimationFrame(() => {\n                this.currentMenuItem.elements.childMenu.focusLastChild();\n              });\n            }\n          } else if (key === \"Home\") {\n            // Hitting Home:\n            // - Moves focus to first item in the menubar.\n            preventEvent(event);\n            this.focusFirstChild();\n          } else if (key === \"End\") {\n            // Hitting End:\n            // - Moves focus to last item in the menubar.\n            preventEvent(event);\n            this.focusLastChild();\n          } else if (key === \"Escape\") {\n            // Hitting Escape:\n            // - Closes menu.\n            const hasOpenChild = this.elements.submenuToggles.some(\n              (toggle) => toggle.isOpen\n            );\n\n            if (hasOpenChild) {\n              preventEvent(event);\n              this.closeChildren();\n            } else if (\n              this.isTopLevel &&\n              this.elements.controller &&\n              this.elements.controller.isOpen\n            ) {\n              preventEvent(event);\n              this.elements.controller.close();\n              this.focusController();\n            }\n          }\n        }\n      } else {\n        if (key === \"Space\" || key === \"Enter\") {\n          // Hitting Space or Enter:\n          // - Activates menu item, causing the link to be activated.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          // Hitting Escape:\n          // - Closes submenu.\n          // - Moves focus to parent menubar item.\n          preventEvent(event);\n          this.elements.rootMenu.closeChildren();\n          this.elements.rootMenu.focusCurrentChild();\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - If focus is on an item with a submenu, opens the submenu and places focus on the first item.\n          // - If focus is on an item that does not have a submenu:\n          //   - Closes submenu.\n          //   - Moves focus to next item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.currentMenuItem.elements.childMenu.currentEvent = \"keyboard\";\n            this.currentMenuItem.elements.toggle.open();\n            // This ensures the the menu is _visually_ open before the child is focussed.\n            requestAnimationFrame(() => {\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            });\n          } else {\n            preventEvent(event);\n            this.elements.rootMenu.closeChildren();\n            this.elements.rootMenu.focusNextChild();\n\n            if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n              this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - Closes submenu and moves focus to parent menu item.\n          // - If parent menu item is in the menubar, also:\n          //   - moves focus to previous item in the menubar.\n          //   - Opens submenu of newly focused menubar item, keeping focus on that parent menubar item.\n          if (this.elements.parentMenu.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n            this.elements.parentMenu.currentMenuItem.elements.toggle.close();\n            this.elements.parentMenu.focusCurrentChild();\n\n            if (this.elements.parentMenu === this.elements.rootMenu) {\n              this.elements.rootMenu.closeChildren();\n              this.elements.rootMenu.focusPreviousChild();\n\n              if (this.elements.rootMenu.currentMenuItem.isSubmenuItem) {\n                this.elements.rootMenu.currentMenuItem.elements.childMenu.currentEvent =\n                  \"keyboard\";\n                this.elements.rootMenu.currentMenuItem.elements.toggle.preview();\n              }\n            }\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next item in the menubar.\n          // - If focus is on the last item, moves focus to the first item.\n          preventEvent(event);\n          this.focusNextChild();\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous item in the menubar.\n          // - If focus is on the first item, moves focus to the last item.\n          preventEvent(event);\n          this.focusPreviousChild();\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first item in the menubar.\n          preventEvent(event);\n          this.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to last item in the menubar.\n          preventEvent(event);\n          this.focusLastChild();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's next child.\n   *\n   * If the currently focussed child in the menu is the last child then this will\n   * focus the first child in the menu.\n   */\n  focusNextChild() {\n    // If the current child is the last child of the menu, focus the menu's first child.\n    if (this.currentChild === this.elements.menuItems.length - 1) {\n      this.focusFirstChild();\n    } else {\n      this.focusChild(this.currentChild + 1);\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   *\n   * If the currently focussed child in the menu is the first child then this will\n   * focus the last child in the menu.\n   */\n  focusPreviousChild() {\n    // If the current child is the first child of the menu, focus the menu's last child.\n    if (this.currentChild === 0) {\n      this.focusLastChild();\n    } else {\n      this.focusChild(this.currentChild - 1);\n    }\n  }\n\n  /**\n   * Focus the menu's next child starting with a specific letter.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextChildWithCharacter(char) {\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    let index = this.currentChild + 1;\n    let found = false;\n\n    while (!found && index < this.elements.menuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (this.elements.menuItems[index].dom.item.innerText) {\n        text = this.elements.menuItems[index].dom.item.innerText;\n      } else {\n        text = this.elements.menuItems[index].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        this.focusChild(index);\n      }\n\n      index++;\n    }\n  }\n}\n\nexport default Menubar;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar Bootstrap4MenubarToggle */\n\nimport MenubarItem from \"accessible-menu/src/menubarItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarItem extends MenubarItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                       options                         - The options for generating the menu item.\n   * @param {HTMLElement}                  options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                  options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Menubar}            options.parentMenu              - The parent menu.\n   * @param {boolean}                      [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Menubar|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4MenubarToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                      [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4MenubarItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Menubar */\n\nimport MenubarToggle from \"accessible-menu/src/menubarToggle.js\";\n\n/*\n * A link or button that controls the visibility of a Bootstrap4Menubar.\n */\nclass Bootstrap4MenubarToggle extends MenubarToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                 options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}            options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}            options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Menubar}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Menubar|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4MenubarToggle;\n","import Menubar from \"accessible-menu/src/menubar.js\";\nimport Bootstrap4MenubarItem from \"./bootstrap4MenubarItem.js\";\nimport Bootstrap4MenubarToggle from \"./bootstrap4MenubarToggle.js\";\n\n/**\n * An accessible menubar navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/menubar/menubar-1/menubar-1.html\n */\nclass Bootstrap4Menubar extends Menubar {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Menubar}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Menubar; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4MenubarItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4MenubarItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4MenubarToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4MenubarToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                   options                             - The options for generating the menu.\n   * @param {HTMLElement}              options.menuElement                 - The menu element in the DOM.\n   * @param {string}                   [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                   [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                   [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                   [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                   [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}       [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}       [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}   [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}   [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                  [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Menubar|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                   [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                   [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                  [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    menuLinkSelector = \".nav-link,.dropdown-item\",\n    submenuItemSelector = \".dropdown\",\n    submenuToggleSelector = \".dropdown-toggle\",\n    submenuSelector = \".dropdown-menu\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"collapse\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default 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\ No newline at end of file
diff --git a/dist/treeview-bs4.esm.js b/dist/treeview-bs4.esm.js
index 807819c..43e4ed6 100644
--- a/dist/treeview-bs4.esm.js
+++ b/dist/treeview-bs4.esm.js
@@ -155,10 +155,28 @@ function isTag(tagName, elements) {
   }
 }
 
-function _defineProperty$5(obj, key, value) { key = _toPropertyKey$5(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$5(arg) { var key = _toPrimitive$5(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$5(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class BaseMenuToggle {
+  _dom = {
+    toggle: null,
+    parent: null
+  };
+  _elements = {
+    controlledMenu: null,
+    parentMenu: null
+  };
+  _open = false;
+  _expandEvent = new CustomEvent("accessibleMenuExpand", {
+    bubbles: true,
+    detail: {
+      toggle: this
+    }
+  });
+  _collapseEvent = new CustomEvent("accessibleMenuCollapse", {
+    bubbles: true,
+    detail: {
+      toggle: this
+    }
+  });
   constructor(_ref) {
     let {
       menuToggleElement,
@@ -166,27 +184,6 @@ class BaseMenuToggle {
       controlledMenu,
       parentMenu = null
     } = _ref;
-    _defineProperty$5(this, "_dom", {
-      toggle: null,
-      parent: null
-    });
-    _defineProperty$5(this, "_elements", {
-      controlledMenu: null,
-      parentMenu: null
-    });
-    _defineProperty$5(this, "_open", false);
-    _defineProperty$5(this, "_expandEvent", new CustomEvent("accessibleMenuExpand", {
-      bubbles: true,
-      detail: {
-        toggle: this
-      }
-    }));
-    _defineProperty$5(this, "_collapseEvent", new CustomEvent("accessibleMenuCollapse", {
-      bubbles: true,
-      detail: {
-        toggle: this
-      }
-    }));
     this._dom.toggle = menuToggleElement;
     this._dom.parent = parentElement;
     this._elements.controlledMenu = controlledMenu;
@@ -331,10 +328,17 @@ class BaseMenuToggle {
   }
 }
 
-function _defineProperty$4(obj, key, value) { key = _toPropertyKey$4(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$4(arg) { var key = _toPrimitive$4(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$4(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class BaseMenuItem {
+  _dom = {
+    item: null,
+    link: null
+  };
+  _elements = {
+    parentMenu: null,
+    childMenu: null,
+    toggle: null
+  };
+  _submenu = false;
   constructor(_ref) {
     let {
       menuItemElement,
@@ -344,16 +348,6 @@ class BaseMenuItem {
       childMenu = null,
       toggle = null
     } = _ref;
-    _defineProperty$4(this, "_dom", {
-      item: null,
-      link: null
-    });
-    _defineProperty$4(this, "_elements", {
-      parentMenu: null,
-      childMenu: null,
-      toggle: null
-    });
-    _defineProperty$4(this, "_submenu", false);
     this._dom.item = menuItemElement;
     this._dom.link = menuLinkElement;
     this._elements.parentMenu = parentMenu;
@@ -410,10 +404,41 @@ function preventEvent(event) {
   event.stopPropagation();
 }
 
-function _defineProperty$3(obj, key, value) { key = _toPropertyKey$3(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$3(arg) { var key = _toPrimitive$3(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$3(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class BaseMenu {
+  _MenuType = BaseMenu;
+  _MenuItemType = BaseMenuItem;
+  _MenuToggleType = BaseMenuToggle;
+  _dom = {
+    menu: null,
+    menuItems: [],
+    submenuItems: [],
+    submenuToggles: [],
+    submenus: [],
+    controller: null,
+    container: null
+  };
+  _selectors = {
+    menuItems: "",
+    menuLinks: "",
+    submenuItems: "",
+    submenuToggles: "",
+    submenus: ""
+  };
+  _elements = {
+    menuItems: [],
+    submenuToggles: [],
+    controller: null,
+    parentMenu: null,
+    rootMenu: null
+  };
+  _openClass = "show";
+  _closeClass = "hide";
+  _root = true;
+  _currentChild = 0;
+  _focusState = "none";
+  _currentEvent = "none";
+  _hoverType = "off";
+  _hoverDelay = 250;
   constructor(_ref) {
     let {
       menuElement,
@@ -431,40 +456,6 @@ class BaseMenu {
       hoverType = "off",
       hoverDelay = 250
     } = _ref;
-    _defineProperty$3(this, "_MenuType", BaseMenu);
-    _defineProperty$3(this, "_MenuItemType", BaseMenuItem);
-    _defineProperty$3(this, "_MenuToggleType", BaseMenuToggle);
-    _defineProperty$3(this, "_dom", {
-      menu: null,
-      menuItems: [],
-      submenuItems: [],
-      submenuToggles: [],
-      submenus: [],
-      controller: null,
-      container: null
-    });
-    _defineProperty$3(this, "_selectors", {
-      menuItems: "",
-      menuLinks: "",
-      submenuItems: "",
-      submenuToggles: "",
-      submenus: ""
-    });
-    _defineProperty$3(this, "_elements", {
-      menuItems: [],
-      submenuToggles: [],
-      controller: null,
-      parentMenu: null,
-      rootMenu: null
-    });
-    _defineProperty$3(this, "_openClass", "show");
-    _defineProperty$3(this, "_closeClass", "hide");
-    _defineProperty$3(this, "_root", true);
-    _defineProperty$3(this, "_currentChild", 0);
-    _defineProperty$3(this, "_focusState", "none");
-    _defineProperty$3(this, "_currentEvent", "none");
-    _defineProperty$3(this, "_hoverType", "off");
-    _defineProperty$3(this, "_hoverDelay", 250);
     this._dom.menu = menuElement;
     this._dom.controller = controllerElement;
     this._dom.container = containerElement;
@@ -917,8 +908,10 @@ class BaseMenu {
         const key = keyPress(event);
         if (key === "Space" || key === "Enter") {
           preventEvent(event);
-          this.elements.controller.open();
-          this.focusFirstChild();
+          this.elements.controller.toggle();
+          if (this.elements.controller.isOpen) {
+            this.focusFirstChild();
+          }
         }
       });
     }
@@ -1061,10 +1054,10 @@ class TreeviewToggle extends BaseMenuToggle {
   }
 }
 
-function _defineProperty$2(obj, key, value) { key = _toPropertyKey$2(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$2(arg) { var key = _toPrimitive$2(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$2(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class Treeview extends BaseMenu {
+  _MenuType = Treeview;
+  _MenuItemType = TreeviewItem;
+  _MenuToggleType = TreeviewToggle;
   constructor(_ref) {
     let {
       menuElement,
@@ -1099,9 +1092,6 @@ class Treeview extends BaseMenu {
       hoverType,
       hoverDelay
     });
-    _defineProperty$2(this, "_MenuType", Treeview);
-    _defineProperty$2(this, "_MenuItemType", TreeviewItem);
-    _defineProperty$2(this, "_MenuToggleType", TreeviewToggle);
     if (initialize) {
       this.initialize();
     }
@@ -1340,10 +1330,12 @@ class Bootstrap4TreeviewItem extends TreeviewItem {
   }
 }
 
-function _defineProperty$1(obj, key, value) { key = _toPropertyKey$1(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey$1(arg) { var key = _toPrimitive$1(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive$1(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class Bootstrap4TreeviewToggle extends TreeviewToggle {
+  _dom = {
+    toggle: null,
+    parent: null,
+    container: null
+  };
   constructor(_ref) {
     let {
       menuToggleElement,
@@ -1359,11 +1351,6 @@ class Bootstrap4TreeviewToggle extends TreeviewToggle {
       parentMenu,
       initialize: false
     });
-    _defineProperty$1(this, "_dom", {
-      toggle: null,
-      parent: null,
-      container: null
-    });
     this._dom.toggle = menuToggleElement;
     this._dom.parent = parentElement;
     this._dom.container = controlledMenu.isTopLevel ? controlledMenu.dom.container : controlledMenu.dom.menu;
@@ -1424,10 +1411,10 @@ class Bootstrap4TreeviewToggle extends TreeviewToggle {
   }
 }
 
-function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
 class Bootstrap4Treeview extends Treeview {
+  _MenuType = Bootstrap4Treeview;
+  _MenuItemType = Bootstrap4TreeviewItem;
+  _MenuToggleType = Bootstrap4TreeviewToggle;
   constructor(_ref) {
     let {
       menuElement,
@@ -1463,9 +1450,6 @@ class Bootstrap4Treeview extends Treeview {
       hoverDelay,
       initialize: false
     });
-    _defineProperty(this, "_MenuType", Bootstrap4Treeview);
-    _defineProperty(this, "_MenuItemType", Bootstrap4TreeviewItem);
-    _defineProperty(this, "_MenuToggleType", Bootstrap4TreeviewToggle);
     if (initialize) {
       this.initialize();
     }
diff --git a/dist/treeview-bs4.esm.js.map b/dist/treeview-bs4.esm.js.map
index 3a6828a..39d2d18 100644
--- a/dist/treeview-bs4.esm.js.map
+++ b/dist/treeview-bs4.esm.js.map
@@ -1 +1 @@
-{"version":3,"file":"treeview-bs4.esm.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/treeviewItem.js","../node_modules/accessible-menu/src/treeviewToggle.js","../node_modules/accessible-menu/src/treeview.js","../src/bootstrap4TreeviewItem.js","../src/bootstrap4TreeviewToggle.js","../src/bootstrap4Treeview.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                    [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                    [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                    [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}        [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}        [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}    [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}    [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                   [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param 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The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. 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The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview, TreeviewToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview Bootstrap4TreeviewToggle */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                    [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                    [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                    [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}        [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}        [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}    [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}    [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                   [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Treeview|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                    [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                    [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                   [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    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diff --git a/dist/treeview-bs4.esm.min.js b/dist/treeview-bs4.esm.min.js
index a1e78ba..7e4fc08 100644
--- a/dist/treeview-bs4.esm.min.js
+++ b/dist/treeview-bs4.esm.min.js
@@ -1,2 +1,2 @@
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t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function h(e){e.preventDefault(),e.stopPropagation()}function c(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:r="",submenuToggleSelector:i="a",submenuSelector:o="ul",controllerElement:m=null,containerElement:h=null,openClass:d="show",closeClass:p="hide",isTopLevel:g=!0,parentMenu:f=null,hoverType:b="off",hoverDelay:v=250}=e;c(this,"_MenuType",a),c(this,"_MenuItemType",u),c(this,"_MenuToggleType",l),c(this,"_dom",{menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null}),c(this,"_selectors",{menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""}),c(this,"_elements",{menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null}),c(this,"_openClass","show"),c(this,"_closeClass","hide"),c(this,"_root",!0),c(this,"_currentChild",0),c(this,"_focusState","none"),c(this,"_currentEvent","none"),c(this,"_hoverType","off"),c(this,"_hoverDelay",250),this._dom.menu=t,this._dom.controller=m,this._dom.container=h,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=r,this._selectors.submenuToggles=i,this._selectors.submenus=o,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=f,this._elements.rootMenu=g?this:null,this._openClass=d||"",this._closeClass=p||"",this._root=g,this._hoverType=b,this._hoverDelay=v}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){r({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let i=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(i=!1):e(HTMLElement,{menuElement:this._dom.menu})||(i=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(i=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(i=!1),""===this._openClass||s({openClass:this._openClass})||(i=!1),""===this._closeClass||s({closeClass:this._closeClass})||(i=!1),t("boolean",{isTopLevel:this._root})||(i=!1),null===this._elements.parentMenu||e(a,{parentMenu:this._elements.parentMenu})||(i=!1),r({hoverType:this._hoverType})||(i=!1),t("number",{hoverDelay:this._hoverDelay})||(i=!1),i}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const r=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?r:[...this._dom[t],...r]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),r=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),i=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:r,parentMenu:this});this._elements.submenuToggles.push(i),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:r,toggle:i})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){h(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||h(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||(h(e),this.elements.controller.open(),this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class d extends u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:r=!1,childMenu:i=null,toggle:l=null,initialize:o=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:r,childMenu:i,toggle:l}),o&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","treeitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.dom.link.tabIndex=0}blur(){super.blur(),this.dom.link.tabIndex=-1}}class p extends l{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:r=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:r}),i&&this.initialize()}}function g(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class f extends a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:r="",submenuToggleSelector:i="a",submenuSelector:l="ul",controllerElement:o=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:b="off",hoverDelay:v=250,initialize:M=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:r,submenuToggleSelector:i,submenuSelector:l,controllerElement:o,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:b,hoverDelay:v}),g(this,"_MenuType",f),g(this,"_MenuItemType",d),g(this,"_MenuToggleType",p),M&&this.initialize()}initialize(){try{super.initialize(),this.isTopLevel?(this.dom.menu.setAttribute("role","tree"),this.elements.menuItems[0].dom.link.tabIndex=0):this.dom.menu.setAttribute("role","group"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?this.elements.rootMenu.blur():this.elements.rootMenu.focus()),"self"===this.focusState){const n=["Enter","ArrowRight"],s=["Escape"];(["Space","ArrowUp","ArrowDown","ArrowLeft","Asterisk","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&h(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e),{altKey:n,crtlKey:s,metaKey:r}=e;if("Character"!==t||(n||s||r)){if("self"===this.focusState)if("Enter"===t||"Space"===t)h(e),this.currentMenuItem.isSubmenuItem?this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview():this.currentMenuItem.dom.link.click();else if("Escape"===t)this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController());else if("ArrowDown"===t)h(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.isTopLevel||this.currentChild!==this.elements.menuItems.length-1?this.focusNextChild():this.focusParentsNextChild();else if("ArrowUp"===t){h(e);const t=this.elements.menuItems[this.currentChild-1];t&&t.isSubmenuItem&&t.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentChild=this.currentChild-1,this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.focusChildsLastNode()):this.isTopLevel||0!==this.currentChild?this.focusPreviousChild():(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())}else"ArrowRight"===t?this.currentMenuItem.isSubmenuItem&&(h(e),this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?(h(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.toggle.close()):this.isTopLevel||(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())):"Home"===t?(h(e),this.blurCurrentChild(),this.elements.rootMenu.focusFirstChild()):"End"===t?(h(e),this.blurCurrentChild(),this.elements.rootMenu.focusLastNode()):"Asterisk"===t&&(h(e),this.openChildren())}else h(e),this.elements.rootMenu.currentEvent="character",this.focusNextNodeWithCharacter(e.key)}))}focusLastNode(){const e=this.elements.menuItems.length-1,t=this.elements.menuItems[e];t.isSubmenuItem&&t.elements.toggle.isOpen?(this.currentChild=e,t.elements.childMenu.currentEvent=this.currentEvent,t.elements.childMenu.focusLastNode()):this.focusLastChild()}openChildren(){this.elements.submenuToggles.forEach((e=>e.preview()))}focusNextNodeWithCharacter(e){const t=e.toLowerCase(),n=function e(t){let n=[];return t.elements.menuItems.forEach((t=>{n.push(t),t.isSubmenuItem&&t.elements.toggle.isOpen&&(n=[...n,...e(t.elements.toggle.elements.controlledMenu)])})),n}(this.elements.rootMenu),s=n.indexOf(this.currentMenuItem)+1,r=[...n.slice(s),...n.slice(0,s)];let i=0,l=!1;for(;!l&&i<r.length;){let e="";if(e=r[i].dom.item.innerText?r[i].dom.item.innerText:r[i].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t){l=!0;const e=r[i].elements.parentMenu,t=e.elements.menuItems.indexOf(r[i]);this.elements.rootMenu.blurChildren(),e.focusChild(t)}i++}}focusParentsNextChild(){this.elements.parentMenu&&(this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.currentChild===this.elements.parentMenu.elements.menuItems.length-1?(this.elements.parentMenu.blurCurrentChild(),this.elements.parentMenu.focusParentsNextChild()):(this.blurChildren(),this.elements.parentMenu.focusNextChild()))}focusChildsLastNode(){this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusLastChild(),this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle.isOpen&&(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.childMenu.focusChildsLastNode())}}class b extends d{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:r=!1,childMenu:i=null,toggle:l=null,initialize:o=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:r,childMenu:i,toggle:l,initialize:!1}),o&&this.initialize()}}function v(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class M extends p{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:r=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:r,initialize:!1}),v(this,"_dom",{toggle:null,parent:null,container:null}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,i&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}function y(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class E extends f{constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:r=".dropdown",submenuToggleSelector:i=".dropdown-toggle",submenuSelector:l=".dropdown-menu",controllerElement:o=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:r,submenuToggleSelector:i,submenuSelector:l,controllerElement:o,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),y(this,"_MenuType",E),y(this,"_MenuItemType",b),y(this,"_MenuToggleType",M),g&&this.initialize()}}export{E as default};
+function e(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${typeof t} given.`)}for(const n in t)if(!(t[n]instanceof e)){const s=typeof t[n];throw new TypeError(`AccessibleMenu: ${n} must be an instance of ${e.name}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function t(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Values given to isValidType() must be inside of an object. ${typeof t} given.`)}for(const n in t){const s=typeof t[n];if(s!==e)throw new TypeError(`AccessibleMenu: ${n} must be a ${e}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function n(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${typeof e} given.`)}for(const t in e)try{if(null===e[t])throw new Error;document.querySelector(e[t])}catch(n){throw new TypeError(`AccessibleMenu: ${t} must be a valid CSS selector. "${e[t]}" given.`)}return!0}catch(e){return console.error(e),!1}}function s(e){try{if("object"!=typeof e||Array.isArray(e)){throw new TypeError(`AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${typeof e} given.`)}for(const t in e){const s=typeof e[t];if("string"!==s){if(!Array.isArray(e[t]))throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. ${s} given.`);e[t].forEach((e=>{if("string"!=typeof e)throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. An array containing non-strings given.`)}))}else{const s={};s[t]=e[t],n(s)}}return!0}catch(e){return console.error(e),!1}}function l(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${typeof e} given.`)}const t=["off","on","dynamic"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}class o{_dom={toggle:null,parent:null};_elements={controlledMenu:null,parentMenu:null};_open=!1;_expandEvent=new CustomEvent("accessibleMenuExpand",{bubbles:!0,detail:{toggle:this}});_collapseEvent=new CustomEvent("accessibleMenuCollapse",{bubbles:!0,detail:{toggle:this}});constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null}=e;this._dom.toggle=t,this._dom.parent=n,this._elements.controlledMenu=s,this._elements.parentMenu=l}initialize(){if(this.dom.toggle.setAttribute("aria-haspopup","true"),this.dom.toggle.setAttribute("aria-expanded","false"),function(n,s){if(t("string",{tagName:n})&&e(HTMLElement,s)){const e=n.toLowerCase();let t=!0;for(const n in s)s[n].tagName.toLowerCase()!==e&&(t=!1);return t}return!1}("button",{toggle:this.dom.toggle})||this.dom.toggle.setAttribute("role","button"),""===this.dom.toggle.id||""===this.elements.controlledMenu.dom.menu.id){const e=Math.random().toString(36).replace(/[^a-z]+/g,"").substr(0,10);let t=this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\s]/g,""),n=e;!t.replace(/\s/g,"").length&&this.dom.toggle.getAttribute("aria-label")&&(t=this.dom.toggle.getAttribute("aria-label").replace(/[^a-zA-Z0-9\s]/g,"")),t.replace(/\s/g,"").length>0&&(t=t.toLowerCase().replace(/\s+/g,"-"),t.startsWith("-")&&(t=t.substring(1)),t.endsWith("-")&&(t=t.slice(0,-1)),n=`${t}-${n}`),this.dom.toggle.id=this.dom.toggle.id||`${n}-menu-button`,this.elements.controlledMenu.dom.menu.id=this.elements.controlledMenu.dom.menu.id||`${n}-menu`}this.elements.controlledMenu.dom.menu.setAttribute("aria-labelledby",this.dom.toggle.id),this.dom.toggle.setAttribute("aria-controls",this.elements.controlledMenu.dom.menu.id),this._collapse(!1)}get dom(){return this._dom}get elements(){return this._elements}get isOpen(){return this._open}set isOpen(e){t("boolean",{value:e}),this._open=e}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.add(n):this.elements.controlledMenu.dom.menu.classList.add(...n)),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.remove(t):this.elements.controlledMenu.dom.menu.classList.remove(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.add(t):this.elements.controlledMenu.dom.menu.classList.add(...t)),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.remove(n):this.elements.controlledMenu.dom.menu.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}open(){this.elements.controlledMenu.focusState="self",this._expand(),this.isOpen=!0}preview(){this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._expand(),this.isOpen=!0}close(){this.isOpen&&(this.elements.controlledMenu.currentChild=0,this.elements.controlledMenu.blur(),this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._collapse(),this.isOpen=!1)}toggle(){this.isOpen?this.close():this.open()}closeSiblings(){this.elements.parentMenu&&this.elements.parentMenu.elements.submenuToggles.forEach((e=>{e!==this&&e.close()}))}closeChildren(){this.elements.controlledMenu.elements.submenuToggles.forEach((e=>e.close()))}}class i{_dom={item:null,link:null};_elements={parentMenu:null,childMenu:null,toggle:null};_submenu=!1;constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:o=null,toggle:i=null}=e;this._dom.item=t,this._dom.link=n,this._elements.parentMenu=s,this._elements.childMenu=o,this._elements.toggle=i,this._submenu=l}initialize(){}get dom(){return this._dom}get elements(){return this._elements}get isSubmenuItem(){return this._submenu}focus(){this.elements.parentMenu.shouldFocus&&this.dom.link.focus()}blur(){this.elements.parentMenu.shouldFocus&&this.dom.link.blur()}}function r(e){try{const t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function u(e){e.preventDefault(),e.stopPropagation()}class m{_MenuType=m;_MenuItemType=i;_MenuToggleType=o;_dom={menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null};_selectors={menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""};_elements={menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null};_openClass="show";_closeClass="hide";_root=!0;_currentChild=0;_focusState="none";_currentEvent="none";_hoverType="off";_hoverDelay=250;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:l="",submenuToggleSelector:o="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250}=e;this._dom.menu=t,this._dom.controller=r,this._dom.container=u,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=l,this._selectors.submenuToggles=o,this._selectors.submenus=i,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=a,this._elements.rootMenu=c?this:null,this._openClass=m||"",this._closeClass=h||"",this._root=c,this._hoverType=d,this._hoverDelay=p}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){l({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let o=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(o=!1):e(HTMLElement,{menuElement:this._dom.menu})||(o=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(o=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(o=!1),""===this._openClass||s({openClass:this._openClass})||(o=!1),""===this._closeClass||s({closeClass:this._closeClass})||(o=!1),t("boolean",{isTopLevel:this._root})||(o=!1),null===this._elements.parentMenu||e(m,{parentMenu:this._elements.parentMenu})||(o=!1),l({hoverType:this._hoverType})||(o=!1),t("number",{hoverDelay:this._hoverDelay})||(o=!1),o}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const l=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?l:[...this._dom[t],...l]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),l=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),o=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:l,parentMenu:this});this._elements.submenuToggles.push(o),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:l,toggle:o})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){u(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||u(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||(u(e),this.elements.controller.toggle(),this.elements.controller.isOpen&&this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class h extends i{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:o=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:o,toggle:i}),r&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","treeitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.dom.link.tabIndex=0}blur(){super.blur(),this.dom.link.tabIndex=-1}}class c extends o{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:o=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l}),o&&this.initialize()}}class a extends m{_MenuType=a;_MenuItemType=h;_MenuToggleType=c;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:l="",submenuToggleSelector:o="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:o,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),g&&this.initialize()}initialize(){try{super.initialize(),this.isTopLevel?(this.dom.menu.setAttribute("role","tree"),this.elements.menuItems[0].dom.link.tabIndex=0):this.dom.menu.setAttribute("role","group"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?this.elements.rootMenu.blur():this.elements.rootMenu.focus()),"self"===this.focusState){const n=["Enter","ArrowRight"],s=["Escape"];(["Space","ArrowUp","ArrowDown","ArrowLeft","Asterisk","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&u(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e),{altKey:n,crtlKey:s,metaKey:l}=e;if("Character"!==t||(n||s||l)){if("self"===this.focusState)if("Enter"===t||"Space"===t)u(e),this.currentMenuItem.isSubmenuItem?this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview():this.currentMenuItem.dom.link.click();else if("Escape"===t)this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController());else if("ArrowDown"===t)u(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.isTopLevel||this.currentChild!==this.elements.menuItems.length-1?this.focusNextChild():this.focusParentsNextChild();else if("ArrowUp"===t){u(e);const t=this.elements.menuItems[this.currentChild-1];t&&t.isSubmenuItem&&t.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentChild=this.currentChild-1,this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.focusChildsLastNode()):this.isTopLevel||0!==this.currentChild?this.focusPreviousChild():(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())}else"ArrowRight"===t?this.currentMenuItem.isSubmenuItem&&(u(e),this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?(u(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.toggle.close()):this.isTopLevel||(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())):"Home"===t?(u(e),this.blurCurrentChild(),this.elements.rootMenu.focusFirstChild()):"End"===t?(u(e),this.blurCurrentChild(),this.elements.rootMenu.focusLastNode()):"Asterisk"===t&&(u(e),this.openChildren())}else u(e),this.elements.rootMenu.currentEvent="character",this.focusNextNodeWithCharacter(e.key)}))}focusLastNode(){const e=this.elements.menuItems.length-1,t=this.elements.menuItems[e];t.isSubmenuItem&&t.elements.toggle.isOpen?(this.currentChild=e,t.elements.childMenu.currentEvent=this.currentEvent,t.elements.childMenu.focusLastNode()):this.focusLastChild()}openChildren(){this.elements.submenuToggles.forEach((e=>e.preview()))}focusNextNodeWithCharacter(e){const t=e.toLowerCase(),n=function e(t){let n=[];return t.elements.menuItems.forEach((t=>{n.push(t),t.isSubmenuItem&&t.elements.toggle.isOpen&&(n=[...n,...e(t.elements.toggle.elements.controlledMenu)])})),n}(this.elements.rootMenu),s=n.indexOf(this.currentMenuItem)+1,l=[...n.slice(s),...n.slice(0,s)];let o=0,i=!1;for(;!i&&o<l.length;){let e="";if(e=l[o].dom.item.innerText?l[o].dom.item.innerText:l[o].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t){i=!0;const e=l[o].elements.parentMenu,t=e.elements.menuItems.indexOf(l[o]);this.elements.rootMenu.blurChildren(),e.focusChild(t)}o++}}focusParentsNextChild(){this.elements.parentMenu&&(this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.currentChild===this.elements.parentMenu.elements.menuItems.length-1?(this.elements.parentMenu.blurCurrentChild(),this.elements.parentMenu.focusParentsNextChild()):(this.blurChildren(),this.elements.parentMenu.focusNextChild()))}focusChildsLastNode(){this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusLastChild(),this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle.isOpen&&(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.childMenu.focusChildsLastNode())}}class d extends h{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:o=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:o,toggle:i,initialize:!1}),r&&this.initialize()}}class p extends c{_dom={toggle:null,parent:null,container:null};constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:o=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l,initialize:!1}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,o&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}class g extends a{_MenuType=g;_MenuItemType=d;_MenuToggleType=p;constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:l=".dropdown",submenuToggleSelector:o=".dropdown-toggle",submenuSelector:i=".dropdown-menu",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:o,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),g&&this.initialize()}}export{g as default};
 //# sourceMappingURL=treeview-bs4.esm.min.js.map
diff --git a/dist/treeview-bs4.esm.min.js.map b/dist/treeview-bs4.esm.min.js.map
index fe6c9ad..ea2581b 100644
--- a/dist/treeview-bs4.esm.min.js.map
+++ b/dist/treeview-bs4.esm.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"treeview-bs4.esm.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/treeviewItem.js","../node_modules/accessible-menu/src/treeviewToggle.js","../node_modules/accessible-menu/src/treeview.js","../src/bootstrap4TreeviewItem.js","../src/bootstrap4TreeviewToggle.js","../src/bootstrap4Treeview.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}     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+{"version":3,"file":"treeview-bs4.esm.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/treeviewItem.js","../node_modules/accessible-menu/src/treeviewToggle.js","../node_modules/accessible-menu/src/treeview.js","../src/bootstrap4TreeviewItem.js","../src/bootstrap4TreeviewToggle.js","../src/bootstrap4Treeview.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview, TreeviewToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview Bootstrap4TreeviewToggle */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                    [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                    [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                    [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}        [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}        [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}    [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}    [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                   [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Treeview|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                    [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                    [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                   [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    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\ No newline at end of file
diff --git a/dist/treeview-bs4.js b/dist/treeview-bs4.js
index f853d50..5493882 100644
--- a/dist/treeview-bs4.js
+++ b/dist/treeview-bs4.js
@@ -158,10 +158,28 @@ var Bootstrap4Treeview = (function () {
     }
   }
 
-  function _defineProperty$5(obj, key, value) { key = _toPropertyKey$5(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$5(arg) { var key = _toPrimitive$5(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$5(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenuToggle {
+    _dom = {
+      toggle: null,
+      parent: null
+    };
+    _elements = {
+      controlledMenu: null,
+      parentMenu: null
+    };
+    _open = false;
+    _expandEvent = new CustomEvent("accessibleMenuExpand", {
+      bubbles: true,
+      detail: {
+        toggle: this
+      }
+    });
+    _collapseEvent = new CustomEvent("accessibleMenuCollapse", {
+      bubbles: true,
+      detail: {
+        toggle: this
+      }
+    });
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -169,27 +187,6 @@ var Bootstrap4Treeview = (function () {
         controlledMenu,
         parentMenu = null
       } = _ref;
-      _defineProperty$5(this, "_dom", {
-        toggle: null,
-        parent: null
-      });
-      _defineProperty$5(this, "_elements", {
-        controlledMenu: null,
-        parentMenu: null
-      });
-      _defineProperty$5(this, "_open", false);
-      _defineProperty$5(this, "_expandEvent", new CustomEvent("accessibleMenuExpand", {
-        bubbles: true,
-        detail: {
-          toggle: this
-        }
-      }));
-      _defineProperty$5(this, "_collapseEvent", new CustomEvent("accessibleMenuCollapse", {
-        bubbles: true,
-        detail: {
-          toggle: this
-        }
-      }));
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._elements.controlledMenu = controlledMenu;
@@ -334,10 +331,17 @@ var Bootstrap4Treeview = (function () {
     }
   }
 
-  function _defineProperty$4(obj, key, value) { key = _toPropertyKey$4(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$4(arg) { var key = _toPrimitive$4(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$4(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenuItem {
+    _dom = {
+      item: null,
+      link: null
+    };
+    _elements = {
+      parentMenu: null,
+      childMenu: null,
+      toggle: null
+    };
+    _submenu = false;
     constructor(_ref) {
       let {
         menuItemElement,
@@ -347,16 +351,6 @@ var Bootstrap4Treeview = (function () {
         childMenu = null,
         toggle = null
       } = _ref;
-      _defineProperty$4(this, "_dom", {
-        item: null,
-        link: null
-      });
-      _defineProperty$4(this, "_elements", {
-        parentMenu: null,
-        childMenu: null,
-        toggle: null
-      });
-      _defineProperty$4(this, "_submenu", false);
       this._dom.item = menuItemElement;
       this._dom.link = menuLinkElement;
       this._elements.parentMenu = parentMenu;
@@ -413,10 +407,41 @@ var Bootstrap4Treeview = (function () {
     event.stopPropagation();
   }
 
-  function _defineProperty$3(obj, key, value) { key = _toPropertyKey$3(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$3(arg) { var key = _toPrimitive$3(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$3(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class BaseMenu {
+    _MenuType = BaseMenu;
+    _MenuItemType = BaseMenuItem;
+    _MenuToggleType = BaseMenuToggle;
+    _dom = {
+      menu: null,
+      menuItems: [],
+      submenuItems: [],
+      submenuToggles: [],
+      submenus: [],
+      controller: null,
+      container: null
+    };
+    _selectors = {
+      menuItems: "",
+      menuLinks: "",
+      submenuItems: "",
+      submenuToggles: "",
+      submenus: ""
+    };
+    _elements = {
+      menuItems: [],
+      submenuToggles: [],
+      controller: null,
+      parentMenu: null,
+      rootMenu: null
+    };
+    _openClass = "show";
+    _closeClass = "hide";
+    _root = true;
+    _currentChild = 0;
+    _focusState = "none";
+    _currentEvent = "none";
+    _hoverType = "off";
+    _hoverDelay = 250;
     constructor(_ref) {
       let {
         menuElement,
@@ -434,40 +459,6 @@ var Bootstrap4Treeview = (function () {
         hoverType = "off",
         hoverDelay = 250
       } = _ref;
-      _defineProperty$3(this, "_MenuType", BaseMenu);
-      _defineProperty$3(this, "_MenuItemType", BaseMenuItem);
-      _defineProperty$3(this, "_MenuToggleType", BaseMenuToggle);
-      _defineProperty$3(this, "_dom", {
-        menu: null,
-        menuItems: [],
-        submenuItems: [],
-        submenuToggles: [],
-        submenus: [],
-        controller: null,
-        container: null
-      });
-      _defineProperty$3(this, "_selectors", {
-        menuItems: "",
-        menuLinks: "",
-        submenuItems: "",
-        submenuToggles: "",
-        submenus: ""
-      });
-      _defineProperty$3(this, "_elements", {
-        menuItems: [],
-        submenuToggles: [],
-        controller: null,
-        parentMenu: null,
-        rootMenu: null
-      });
-      _defineProperty$3(this, "_openClass", "show");
-      _defineProperty$3(this, "_closeClass", "hide");
-      _defineProperty$3(this, "_root", true);
-      _defineProperty$3(this, "_currentChild", 0);
-      _defineProperty$3(this, "_focusState", "none");
-      _defineProperty$3(this, "_currentEvent", "none");
-      _defineProperty$3(this, "_hoverType", "off");
-      _defineProperty$3(this, "_hoverDelay", 250);
       this._dom.menu = menuElement;
       this._dom.controller = controllerElement;
       this._dom.container = containerElement;
@@ -920,8 +911,10 @@ var Bootstrap4Treeview = (function () {
           const key = keyPress(event);
           if (key === "Space" || key === "Enter") {
             preventEvent(event);
-            this.elements.controller.open();
-            this.focusFirstChild();
+            this.elements.controller.toggle();
+            if (this.elements.controller.isOpen) {
+              this.focusFirstChild();
+            }
           }
         });
       }
@@ -1064,10 +1057,10 @@ var Bootstrap4Treeview = (function () {
     }
   }
 
-  function _defineProperty$2(obj, key, value) { key = _toPropertyKey$2(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$2(arg) { var key = _toPrimitive$2(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$2(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Treeview extends BaseMenu {
+    _MenuType = Treeview;
+    _MenuItemType = TreeviewItem;
+    _MenuToggleType = TreeviewToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -1102,9 +1095,6 @@ var Bootstrap4Treeview = (function () {
         hoverType,
         hoverDelay
       });
-      _defineProperty$2(this, "_MenuType", Treeview);
-      _defineProperty$2(this, "_MenuItemType", TreeviewItem);
-      _defineProperty$2(this, "_MenuToggleType", TreeviewToggle);
       if (initialize) {
         this.initialize();
       }
@@ -1343,10 +1333,12 @@ var Bootstrap4Treeview = (function () {
     }
   }
 
-  function _defineProperty$1(obj, key, value) { key = _toPropertyKey$1(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey$1(arg) { var key = _toPrimitive$1(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive$1(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4TreeviewToggle extends TreeviewToggle {
+    _dom = {
+      toggle: null,
+      parent: null,
+      container: null
+    };
     constructor(_ref) {
       let {
         menuToggleElement,
@@ -1362,11 +1354,6 @@ var Bootstrap4Treeview = (function () {
         parentMenu,
         initialize: false
       });
-      _defineProperty$1(this, "_dom", {
-        toggle: null,
-        parent: null,
-        container: null
-      });
       this._dom.toggle = menuToggleElement;
       this._dom.parent = parentElement;
       this._dom.container = controlledMenu.isTopLevel ? controlledMenu.dom.container : controlledMenu.dom.menu;
@@ -1427,10 +1414,10 @@ var Bootstrap4Treeview = (function () {
     }
   }
 
-  function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
-  function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
-  function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
   class Bootstrap4Treeview extends Treeview {
+    _MenuType = Bootstrap4Treeview;
+    _MenuItemType = Bootstrap4TreeviewItem;
+    _MenuToggleType = Bootstrap4TreeviewToggle;
     constructor(_ref) {
       let {
         menuElement,
@@ -1466,9 +1453,6 @@ var Bootstrap4Treeview = (function () {
         hoverDelay,
         initialize: false
       });
-      _defineProperty(this, "_MenuType", Bootstrap4Treeview);
-      _defineProperty(this, "_MenuItemType", Bootstrap4TreeviewItem);
-      _defineProperty(this, "_MenuToggleType", Bootstrap4TreeviewToggle);
       if (initialize) {
         this.initialize();
       }
diff --git a/dist/treeview-bs4.js.map b/dist/treeview-bs4.js.map
index 39899bb..6554bf3 100644
--- a/dist/treeview-bs4.js.map
+++ b/dist/treeview-bs4.js.map
@@ -1 +1 @@
-{"version":3,"file":"treeview-bs4.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/treeviewItem.js","../node_modules/accessible-menu/src/treeviewToggle.js","../node_modules/accessible-menu/src/treeview.js","../src/bootstrap4TreeviewItem.js","../src/bootstrap4TreeviewToggle.js","../src/bootstrap4Treeview.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}     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The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview, TreeviewToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview Bootstrap4TreeviewToggle */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                    [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                    [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                    [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}        [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}        [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}    [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}    [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                   [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Treeview|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                    [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                    [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                   [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    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diff --git a/dist/treeview-bs4.min.js b/dist/treeview-bs4.min.js
index 88b7c69..b64c8ec 100644
--- a/dist/treeview-bs4.min.js
+++ b/dist/treeview-bs4.min.js
@@ -1,2 +1,2 @@
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t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function h(e){e.preventDefault(),e.stopPropagation()}function c(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:r="",submenuToggleSelector:i="a",submenuSelector:l="ul",controllerElement:m=null,containerElement:h=null,openClass:d="show",closeClass:p="hide",isTopLevel:g=!0,parentMenu:f=null,hoverType:b="off",hoverDelay:v=250}=e;c(this,"_MenuType",a),c(this,"_MenuItemType",u),c(this,"_MenuToggleType",o),c(this,"_dom",{menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null}),c(this,"_selectors",{menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""}),c(this,"_elements",{menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null}),c(this,"_openClass","show"),c(this,"_closeClass","hide"),c(this,"_root",!0),c(this,"_currentChild",0),c(this,"_focusState","none"),c(this,"_currentEvent","none"),c(this,"_hoverType","off"),c(this,"_hoverDelay",250),this._dom.menu=t,this._dom.controller=m,this._dom.container=h,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=r,this._selectors.submenuToggles=i,this._selectors.submenus=l,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=f,this._elements.rootMenu=g?this:null,this._openClass=d||"",this._closeClass=p||"",this._root=g,this._hoverType=b,this._hoverDelay=v}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){r({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let i=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(i=!1):e(HTMLElement,{menuElement:this._dom.menu})||(i=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(i=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(i=!1),""===this._openClass||s({openClass:this._openClass})||(i=!1),""===this._closeClass||s({closeClass:this._closeClass})||(i=!1),t("boolean",{isTopLevel:this._root})||(i=!1),null===this._elements.parentMenu||e(a,{parentMenu:this._elements.parentMenu})||(i=!1),r({hoverType:this._hoverType})||(i=!1),t("number",{hoverDelay:this._hoverDelay})||(i=!1),i}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const r=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?r:[...this._dom[t],...r]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),r=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),i=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:r,parentMenu:this});this._elements.submenuToggles.push(i),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:r,toggle:i})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){h(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||h(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e);"Space"!==t&&"Enter"!==t||(h(e),this.elements.controller.open(),this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class d extends u{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:r=!1,childMenu:i=null,toggle:o=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:r,childMenu:i,toggle:o}),l&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","treeitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.dom.link.tabIndex=0}blur(){super.blur(),this.dom.link.tabIndex=-1}}class p extends o{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:r=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:r}),i&&this.initialize()}}function g(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class f extends a{constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:r="",submenuToggleSelector:i="a",submenuSelector:o="ul",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:b="off",hoverDelay:v=250,initialize:M=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:r,submenuToggleSelector:i,submenuSelector:o,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:b,hoverDelay:v}),g(this,"_MenuType",f),g(this,"_MenuItemType",d),g(this,"_MenuToggleType",p),M&&this.initialize()}initialize(){try{super.initialize(),this.isTopLevel?(this.dom.menu.setAttribute("role","tree"),this.elements.menuItems[0].dom.link.tabIndex=0):this.dom.menu.setAttribute("role","group"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=m(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?this.elements.rootMenu.blur():this.elements.rootMenu.focus()),"self"===this.focusState){const n=["Enter","ArrowRight"],s=["Escape"];(["Space","ArrowUp","ArrowDown","ArrowLeft","Asterisk","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&h(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=m(e),{altKey:n,crtlKey:s,metaKey:r}=e;if("Character"!==t||(n||s||r)){if("self"===this.focusState)if("Enter"===t||"Space"===t)h(e),this.currentMenuItem.isSubmenuItem?this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview():this.currentMenuItem.dom.link.click();else if("Escape"===t)this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController());else if("ArrowDown"===t)h(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.isTopLevel||this.currentChild!==this.elements.menuItems.length-1?this.focusNextChild():this.focusParentsNextChild();else if("ArrowUp"===t){h(e);const t=this.elements.menuItems[this.currentChild-1];t&&t.isSubmenuItem&&t.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentChild=this.currentChild-1,this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.focusChildsLastNode()):this.isTopLevel||0!==this.currentChild?this.focusPreviousChild():(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())}else"ArrowRight"===t?this.currentMenuItem.isSubmenuItem&&(h(e),this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?(h(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.toggle.close()):this.isTopLevel||(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())):"Home"===t?(h(e),this.blurCurrentChild(),this.elements.rootMenu.focusFirstChild()):"End"===t?(h(e),this.blurCurrentChild(),this.elements.rootMenu.focusLastNode()):"Asterisk"===t&&(h(e),this.openChildren())}else h(e),this.elements.rootMenu.currentEvent="character",this.focusNextNodeWithCharacter(e.key)}))}focusLastNode(){const e=this.elements.menuItems.length-1,t=this.elements.menuItems[e];t.isSubmenuItem&&t.elements.toggle.isOpen?(this.currentChild=e,t.elements.childMenu.currentEvent=this.currentEvent,t.elements.childMenu.focusLastNode()):this.focusLastChild()}openChildren(){this.elements.submenuToggles.forEach((e=>e.preview()))}focusNextNodeWithCharacter(e){const t=e.toLowerCase(),n=function e(t){let n=[];return t.elements.menuItems.forEach((t=>{n.push(t),t.isSubmenuItem&&t.elements.toggle.isOpen&&(n=[...n,...e(t.elements.toggle.elements.controlledMenu)])})),n}(this.elements.rootMenu),s=n.indexOf(this.currentMenuItem)+1,r=[...n.slice(s),...n.slice(0,s)];let i=0,o=!1;for(;!o&&i<r.length;){let e="";if(e=r[i].dom.item.innerText?r[i].dom.item.innerText:r[i].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t){o=!0;const e=r[i].elements.parentMenu,t=e.elements.menuItems.indexOf(r[i]);this.elements.rootMenu.blurChildren(),e.focusChild(t)}i++}}focusParentsNextChild(){this.elements.parentMenu&&(this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.currentChild===this.elements.parentMenu.elements.menuItems.length-1?(this.elements.parentMenu.blurCurrentChild(),this.elements.parentMenu.focusParentsNextChild()):(this.blurChildren(),this.elements.parentMenu.focusNextChild()))}focusChildsLastNode(){this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusLastChild(),this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle.isOpen&&(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.childMenu.focusChildsLastNode())}}class b extends d{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:r=!1,childMenu:i=null,toggle:o=null,initialize:l=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:r,childMenu:i,toggle:o,initialize:!1}),l&&this.initialize()}}function v(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class M extends p{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:r=null,initialize:i=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:r,initialize:!1}),v(this,"_dom",{toggle:null,parent:null,container:null}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,i&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}function y(e,t,n){return(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var n=e[Symbol.toPrimitive];if(void 0!==n){var s=n.call(e,t||"default");if("object"!=typeof s)return s;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}class E extends f{constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:r=".dropdown",submenuToggleSelector:i=".dropdown-toggle",submenuSelector:o=".dropdown-menu",controllerElement:l=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:r,submenuToggleSelector:i,submenuSelector:o,controllerElement:l,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),y(this,"_MenuType",E),y(this,"_MenuItemType",b),y(this,"_MenuToggleType",M),g&&this.initialize()}}return E}();
+var Bootstrap4Treeview=function(){"use strict";function e(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${typeof t} given.`)}for(const n in t)if(!(t[n]instanceof e)){const s=typeof t[n];throw new TypeError(`AccessibleMenu: ${n} must be an instance of ${e.name}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function t(e,t){try{if("object"!=typeof t){throw new TypeError(`AccessibleMenu: Values given to isValidType() must be inside of an object. ${typeof t} given.`)}for(const n in t){const s=typeof t[n];if(s!==e)throw new TypeError(`AccessibleMenu: ${n} must be a ${e}. ${s} given.`)}return!0}catch(e){return console.error(e),!1}}function n(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${typeof e} given.`)}for(const t in e)try{if(null===e[t])throw new Error;document.querySelector(e[t])}catch(n){throw new TypeError(`AccessibleMenu: ${t} must be a valid CSS selector. "${e[t]}" given.`)}return!0}catch(e){return console.error(e),!1}}function s(e){try{if("object"!=typeof e||Array.isArray(e)){throw new TypeError(`AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${typeof e} given.`)}for(const t in e){const s=typeof e[t];if("string"!==s){if(!Array.isArray(e[t]))throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. ${s} given.`);e[t].forEach((e=>{if("string"!=typeof e)throw new TypeError(`AccessibleMenu: ${t} must be a string or an array of strings. An array containing non-strings given.`)}))}else{const s={};s[t]=e[t],n(s)}}return!0}catch(e){return console.error(e),!1}}function l(e){try{if("object"!=typeof e){throw new TypeError(`AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${typeof e} given.`)}const t=["off","on","dynamic"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}class o{_dom={toggle:null,parent:null};_elements={controlledMenu:null,parentMenu:null};_open=!1;_expandEvent=new CustomEvent("accessibleMenuExpand",{bubbles:!0,detail:{toggle:this}});_collapseEvent=new CustomEvent("accessibleMenuCollapse",{bubbles:!0,detail:{toggle:this}});constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null}=e;this._dom.toggle=t,this._dom.parent=n,this._elements.controlledMenu=s,this._elements.parentMenu=l}initialize(){if(this.dom.toggle.setAttribute("aria-haspopup","true"),this.dom.toggle.setAttribute("aria-expanded","false"),function(n,s){if(t("string",{tagName:n})&&e(HTMLElement,s)){const e=n.toLowerCase();let t=!0;for(const n in s)s[n].tagName.toLowerCase()!==e&&(t=!1);return t}return!1}("button",{toggle:this.dom.toggle})||this.dom.toggle.setAttribute("role","button"),""===this.dom.toggle.id||""===this.elements.controlledMenu.dom.menu.id){const e=Math.random().toString(36).replace(/[^a-z]+/g,"").substr(0,10);let t=this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\s]/g,""),n=e;!t.replace(/\s/g,"").length&&this.dom.toggle.getAttribute("aria-label")&&(t=this.dom.toggle.getAttribute("aria-label").replace(/[^a-zA-Z0-9\s]/g,"")),t.replace(/\s/g,"").length>0&&(t=t.toLowerCase().replace(/\s+/g,"-"),t.startsWith("-")&&(t=t.substring(1)),t.endsWith("-")&&(t=t.slice(0,-1)),n=`${t}-${n}`),this.dom.toggle.id=this.dom.toggle.id||`${n}-menu-button`,this.elements.controlledMenu.dom.menu.id=this.elements.controlledMenu.dom.menu.id||`${n}-menu`}this.elements.controlledMenu.dom.menu.setAttribute("aria-labelledby",this.dom.toggle.id),this.dom.toggle.setAttribute("aria-controls",this.elements.controlledMenu.dom.menu.id),this._collapse(!1)}get dom(){return this._dom}get elements(){return this._elements}get isOpen(){return this._open}set isOpen(e){t("boolean",{value:e}),this._open=e}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.add(n):this.elements.controlledMenu.dom.menu.classList.add(...n)),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.remove(t):this.elements.controlledMenu.dom.menu.classList.remove(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.elements.controlledMenu.dom.menu.classList.add(t):this.elements.controlledMenu.dom.menu.classList.add(...t)),""!==n&&("string"==typeof n?this.elements.controlledMenu.dom.menu.classList.remove(n):this.elements.controlledMenu.dom.menu.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}open(){this.elements.controlledMenu.focusState="self",this._expand(),this.isOpen=!0}preview(){this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._expand(),this.isOpen=!0}close(){this.isOpen&&(this.elements.controlledMenu.currentChild=0,this.elements.controlledMenu.blur(),this.elements.parentMenu&&(this.elements.parentMenu.focusState="self"),this._collapse(),this.isOpen=!1)}toggle(){this.isOpen?this.close():this.open()}closeSiblings(){this.elements.parentMenu&&this.elements.parentMenu.elements.submenuToggles.forEach((e=>{e!==this&&e.close()}))}closeChildren(){this.elements.controlledMenu.elements.submenuToggles.forEach((e=>e.close()))}}class i{_dom={item:null,link:null};_elements={parentMenu:null,childMenu:null,toggle:null};_submenu=!1;constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:o=null,toggle:i=null}=e;this._dom.item=t,this._dom.link=n,this._elements.parentMenu=s,this._elements.childMenu=o,this._elements.toggle=i,this._submenu=l}initialize(){}get dom(){return this._dom}get elements(){return this._elements}get isSubmenuItem(){return this._submenu}focus(){this.elements.parentMenu.shouldFocus&&this.dom.link.focus()}blur(){this.elements.parentMenu.shouldFocus&&this.dom.link.blur()}}function r(e){try{const t=e.key||e.keyCode,n={Enter:"Enter"===t||13===t,Space:" "===t||"Spacebar"===t||32===t,Escape:"Escape"===t||"Esc"===t||27===t,ArrowUp:"ArrowUp"===t||"Up"===t||38===t,ArrowRight:"ArrowRight"===t||"Right"===t||39===t,ArrowDown:"ArrowDown"===t||"Down"===t||40===t,ArrowLeft:"ArrowLeft"===t||"Left"===t||37===t,Home:"Home"===t||36===t,End:"End"===t||35===t,Character:isNaN(t)&&!!t.match(/^[a-zA-Z]{1}$/),Tab:"Tab"===t||9===t,Asterisk:"*"===t||56===t};return Object.keys(n).find((e=>!0===n[e]))||""}catch(e){return""}}function u(e){e.preventDefault(),e.stopPropagation()}class m{_MenuType=m;_MenuItemType=i;_MenuToggleType=o;_dom={menu:null,menuItems:[],submenuItems:[],submenuToggles:[],submenus:[],controller:null,container:null};_selectors={menuItems:"",menuLinks:"",submenuItems:"",submenuToggles:"",submenus:""};_elements={menuItems:[],submenuToggles:[],controller:null,parentMenu:null,rootMenu:null};_openClass="show";_closeClass="hide";_root=!0;_currentChild=0;_focusState="none";_currentEvent="none";_hoverType="off";_hoverDelay=250;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:l="",submenuToggleSelector:o="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250}=e;this._dom.menu=t,this._dom.controller=r,this._dom.container=u,this._selectors.menuItems=n,this._selectors.menuLinks=s,this._selectors.submenuItems=l,this._selectors.submenuToggles=o,this._selectors.submenus=i,this._elements.menuItems=[],this._elements.submenuToggles=[],this._elements.controller=null,this._elements.parentMenu=a,this._elements.rootMenu=c?this:null,this._openClass=m||"",this._closeClass=h||"",this._root=c,this._hoverType=d,this._hoverDelay=p}initialize(){if(!this._validate())throw new Error("AccesibleMenu: cannot initialize menu. See other error messages for more information.");if(null===this.elements.rootMenu&&this._findRootMenu(this),this._setDOMElements(),this.isTopLevel&&this.dom.controller&&this.dom.container){const e=new this._MenuToggleType({menuToggleElement:this.dom.controller,parentElement:this.dom.container,controlledMenu:this});this._elements.controller=e}this._createChildElements()}get dom(){return this._dom}get selectors(){return this._selectors}get elements(){return this._elements}get isTopLevel(){return this._root}get openClass(){return this.isTopLevel?this._openClass:this.elements.rootMenu.openClass}get closeClass(){return this.isTopLevel?this._closeClass:this.elements.rootMenu.closeClass}get currentChild(){return this._currentChild}get focusState(){return this._focusState}get currentEvent(){return this._currentEvent}get currentMenuItem(){return this.elements.menuItems[this.currentChild]}get hoverType(){return this._root?this._hoverType:this.elements.rootMenu.hoverType}get hoverDelay(){return this._root?this._hoverDelay:this.elements.rootMenu.hoverDelay}get shouldFocus(){let e=!1;return"keyboard"!==this.currentEvent&&"character"!==this.currentEvent||(e=!0),"mouse"===this.currentEvent&&"dynamic"===this.hoverType&&(e=!0),e}set openClass(e){s({openClass:e}),this._openClass!==e&&(this._openClass=e)}set closeClass(e){s({closeClass:e}),this._closeClass!==e&&(this._closeClass=e)}set currentChild(e){function n(e){if(["mouse","character"].includes(e.currentEvent)&&e.elements.parentMenu){let t=0,n=!1;for(;!n&&t<e.elements.parentMenu.elements.menuItems.length;){const s=e.elements.parentMenu.elements.menuItems[t];s.isSubmenuItem&&s.elements.toggle.elements.controlledMenu===e&&(n=!0,e.elements.parentMenu.currentEvent=e.currentEvent,e.elements.parentMenu.currentChild=t),t++}}}t("number",{value:e}),e<-1?(this._currentChild=-1,n(this)):e>=this.elements.menuItems.length?(this._currentChild=this.elements.menuItems.length-1,n(this)):this.focusChild!==e&&(this._currentChild=e,n(this))}set focusState(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidState() must be inside of an object. ${typeof e} given.`);const t=["none","self","child"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._focusState!==e&&(this._focusState=e),this.elements.submenuToggles.length>0&&("self"===e||"none"===e)&&this.elements.submenuToggles.forEach((e=>{e.elements.controlledMenu.focusState="none"})),!this.elements.parentMenu||"self"!==e&&"child"!==e||(this.elements.parentMenu.focusState="child")}set currentEvent(e){!function(e){try{if("object"!=typeof e)throw new TypeError(`AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${typeof e} given.`);const t=["none","mouse","keyboard","character"];for(const n in e)if(!t.includes(e[n]))throw new TypeError(`AccessibleMenu: ${n} must be one of the following values: ${t.join(", ")}. "${e[n]}" given.`);return!0}catch(e){return console.error(e),!1}}({value:e}),this._currentEvent!==e&&(this._currentEvent=e,this.elements.submenuToggles.length>0&&this.elements.submenuToggles.forEach((t=>{t.elements.controlledMenu.currentEvent=e})))}set hoverType(e){l({value:e}),this._hoverType!==e&&(this._hoverType=e)}set hoverDelay(e){t("number",{value:e}),this._hoverDelay!==e&&(this._hoverDelay=e)}_validate(){let o=!0;return null!==this._dom.container||null!==this._dom.controller?e(HTMLElement,{menuElement:this._dom.menu,controllerElement:this._dom.controller,containerElement:this._dom.container})||(o=!1):e(HTMLElement,{menuElement:this._dom.menu})||(o=!1),""!==this._selectors.submenuItems?n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks,submenuItemSelector:this._selectors.submenuItems,submenuToggleSelector:this._selectors.submenuToggles,submenuSelector:this._selectors.submenus})||(o=!1):n({menuItemSelector:this._selectors.menuItems,menuLinkSelector:this._selectors.menuLinks})||(o=!1),""===this._openClass||s({openClass:this._openClass})||(o=!1),""===this._closeClass||s({closeClass:this._closeClass})||(o=!1),t("boolean",{isTopLevel:this._root})||(o=!1),null===this._elements.parentMenu||e(m,{parentMenu:this._elements.parentMenu})||(o=!1),l({hoverType:this._hoverType})||(o=!1),t("number",{hoverDelay:this._hoverDelay})||(o=!1),o}_setDOMElementType(t){let n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.dom.menu,s=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if("string"!=typeof this.selectors[t])throw new Error(`AccessibleMenu: "${t}" is not a valid element type within the menu.`);{if(!Array.isArray(this.dom[t]))throw new Error(`AccessibleMenu: The "${t}" element cannot be set through _setDOMElementType.`);n!==this.dom.menu&&e(HTMLElement,{base:n});const l=Array.from(n.querySelectorAll(this.selectors[t])).filter((e=>e.parentElement===n));this._dom[t]=s?l:[...this._dom[t],...l]}}_resetDOMElementType(e){if(void 0===this.dom[e])throw new Error(`AccessibleMenu: "${e}" is not a valid element type within the menu.`);if(!Array.isArray(this.dom[e]))throw new Error(`AccessibleMenu: The "${e}" element cannot be reset through _resetDOMElementType.`);this._dom[e]=[]}_setDOMElements(){this._setDOMElementType("menuItems"),""!==this.selectors.submenuItems&&(this._setDOMElementType("submenuItems"),this._resetDOMElementType("submenuToggles"),this._resetDOMElementType("submenus"),this.dom.submenuItems.forEach((e=>{this._setDOMElementType("submenuToggles",e,!1),this._setDOMElementType("submenus",e,!1)})))}_findRootMenu(e){if(e.isTopLevel)this._elements.rootMenu=e;else{if(null===e.elements.parentMenu)throw new Error("Cannot find root menu.");this._findRootMenu(e.elements.parentMenu)}}_createChildElements(){this.dom.menuItems.forEach((e=>{let t;if(this.dom.submenuItems.includes(e)){const n=e.querySelector(this.selectors.submenuToggles),s=e.querySelector(this.selectors.submenus),l=new this._MenuType({menuElement:s,menuItemSelector:this.selectors.menuItems,menuLinkSelector:this.selectors.menuLinks,submenuItemSelector:this.selectors.submenuItems,submenuToggleSelector:this.selectors.submenuToggles,submenuSelector:this.selectors.submenus,openClass:this.openClass,closeClass:this.closeClass,isTopLevel:!1,parentMenu:this,hoverType:this.hoverType,hoverDelay:this.hoverDelay}),o=new this._MenuToggleType({menuToggleElement:n,parentElement:e,controlledMenu:l,parentMenu:this});this._elements.submenuToggles.push(o),t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this,isSubmenuItem:!0,childMenu:l,toggle:o})}else{const n=e.querySelector(this.selectors.menuLinks);t=new this._MenuItemType({menuItemElement:e,menuLinkElement:n,parentMenu:this})}this._elements.menuItems.push(t)}))}_handleFocus(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("focus",(()=>{this.focusState="self",this.currentChild=t}))}))}_handleClick(){function e(e,t,n){u(n),t.toggle(),t.isOpen&&(e.focusState="self",t.elements.controlledMenu.focusState="none")}this.elements.menuItems.forEach(((t,n)=>{t.dom.link.addEventListener("pointerdown",(()=>{this.currentEvent="mouse",this.elements.rootMenu.blurChildren(),this.focusChild(n)}),{passive:!0}),t.isSubmenuItem&&t.elements.toggle.dom.toggle.addEventListener("pointerup",(n=>{this.currentEvent="mouse",e(this,t.elements.toggle,n)}))})),this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("pointerup",(t=>{this.currentEvent="mouse",e(this,this.elements.controller,t)}))}_handleHover(){this.elements.menuItems.forEach(((e,t)=>{e.dom.link.addEventListener("pointerenter",(n=>{if("pen"!==n.pointerType&&"touch"!==n.pointerType)if("on"===this.hoverType)this.currentEvent="mouse",this.currentChild=t,e.isSubmenuItem&&e.elements.toggle.preview();else if("dynamic"===this.hoverType){const n=this.elements.submenuToggles.some((e=>e.isOpen));this.currentChild=t,this.isTopLevel&&"none"===this.focusState||(this.currentEvent="mouse",this.focusCurrentChild()),!e.isSubmenuItem||this.isTopLevel&&!n||(this.currentEvent="mouse",e.elements.toggle.preview())}})),e.isSubmenuItem&&e.dom.item.addEventListener("pointerleave",(t=>{"pen"!==t.pointerType&&"touch"!==t.pointerType&&("on"===this.hoverType?this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close()):"dynamic"===this.hoverType&&(this.isTopLevel||(this.hoverDelay>0?setTimeout((()=>{this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()}),this.hoverDelay):(this.currentEvent="mouse",e.elements.toggle.close(),this.focusCurrentChild()))))}))}))}_handleKeydown(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||u(e)}))}_handleKeyup(){this.isTopLevel&&this.elements.controller&&this.elements.controller.dom.toggle.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e);"Space"!==t&&"Enter"!==t||(u(e),this.elements.controller.toggle(),this.elements.controller.isOpen&&this.focusFirstChild())}))}focus(){this.focusState="self",this.shouldFocus&&this.dom.menu.focus()}blur(){this.focusState="none",this.shouldFocus&&this.dom.menu.blur()}focusCurrentChild(){this.focusState="self",-1!==this.currentChild&&this.currentMenuItem.focus()}focusChild(e){this.blurCurrentChild(),this.currentChild=e,this.focusCurrentChild()}focusFirstChild(){this.focusChild(0)}focusLastChild(){this.focusChild(this.elements.menuItems.length-1)}focusNextChild(){this.currentChild<this.elements.menuItems.length-1?this.focusChild(this.currentChild+1):this.focusCurrentChild()}focusPreviousChild(){this.currentChild>0?this.focusChild(this.currentChild-1):this.focusCurrentChild()}blurCurrentChild(){this.focusState="none",-1!==this.currentChild&&this.currentMenuItem.blur()}focusController(){this.dom.controller&&(this.shouldFocus&&this.dom.controller.focus(),this.focusState="none")}focusContainer(){this.dom.container&&(this.shouldFocus&&this.dom.container.focus(),this.focusState="none")}closeChildren(){this.elements.submenuToggles.forEach((e=>e.close()))}blurChildren(){this.elements.menuItems.forEach((e=>{e.blur(),e.isSubmenuItem&&e.elements.childMenu.blurChildren()}))}}class h extends i{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:o=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:o,toggle:i}),r&&this.initialize()}initialize(){super.initialize(),this.dom.item.setAttribute("role","none"),this.dom.link.setAttribute("role","treeitem"),this.dom.link.tabIndex=-1}focus(){super.focus(),this.dom.link.tabIndex=0}blur(){super.blur(),this.dom.link.tabIndex=-1}}class c extends o{constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:o=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l}),o&&this.initialize()}}class a extends m{_MenuType=a;_MenuItemType=h;_MenuToggleType=c;constructor(e){let{menuElement:t,menuItemSelector:n="li",menuLinkSelector:s="a",submenuItemSelector:l="",submenuToggleSelector:o="a",submenuSelector:i="ul",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="hide",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:o,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p}),g&&this.initialize()}initialize(){try{super.initialize(),this.isTopLevel?(this.dom.menu.setAttribute("role","tree"),this.elements.menuItems[0].dom.link.tabIndex=0):this.dom.menu.setAttribute("role","group"),this._handleFocus(),this._handleClick(),this._handleHover(),this._handleKeydown(),this._handleKeyup()}catch(e){console.error(e)}}_handleKeydown(){super._handleKeydown(),this.dom.menu.addEventListener("keydown",(e=>{this.currentEvent="keyboard";const t=r(e);if("Tab"===t&&("none"!==this.elements.rootMenu.focusState?this.elements.rootMenu.blur():this.elements.rootMenu.focus()),"self"===this.focusState){const n=["Enter","ArrowRight"],s=["Escape"];(["Space","ArrowUp","ArrowDown","ArrowLeft","Asterisk","Home","End"].includes(t)||this.currentMenuItem.isSubmenuItem&&n.includes(t)||this.elements.controller&&s.includes(t))&&u(e)}}))}_handleKeyup(){super._handleKeyup(),this.dom.menu.addEventListener("keyup",(e=>{this.currentEvent="keyboard";const t=r(e),{altKey:n,crtlKey:s,metaKey:l}=e;if("Character"!==t||(n||s||l)){if("self"===this.focusState)if("Enter"===t||"Space"===t)u(e),this.currentMenuItem.isSubmenuItem?this.currentMenuItem.elements.toggle.isOpen?this.currentMenuItem.elements.toggle.close():this.currentMenuItem.elements.toggle.preview():this.currentMenuItem.dom.link.click();else if("Escape"===t)this.isTopLevel&&this.elements.controller&&this.elements.controller.isOpen&&(this.elements.controller.close(),this.focusController());else if("ArrowDown"===t)u(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.isTopLevel||this.currentChild!==this.elements.menuItems.length-1?this.focusNextChild():this.focusParentsNextChild();else if("ArrowUp"===t){u(e);const t=this.elements.menuItems[this.currentChild-1];t&&t.isSubmenuItem&&t.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentChild=this.currentChild-1,this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.focusChildsLastNode()):this.isTopLevel||0!==this.currentChild?this.focusPreviousChild():(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())}else"ArrowRight"===t?this.currentMenuItem.isSubmenuItem&&(u(e),this.currentMenuItem.elements.toggle.isOpen?(this.blurCurrentChild(),this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusFirstChild()):this.currentMenuItem.elements.toggle.preview()):"ArrowLeft"===t?(u(e),this.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.toggle.isOpen?(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.toggle.close()):this.isTopLevel||(this.blurCurrentChild(),this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.focusCurrentChild())):"Home"===t?(u(e),this.blurCurrentChild(),this.elements.rootMenu.focusFirstChild()):"End"===t?(u(e),this.blurCurrentChild(),this.elements.rootMenu.focusLastNode()):"Asterisk"===t&&(u(e),this.openChildren())}else u(e),this.elements.rootMenu.currentEvent="character",this.focusNextNodeWithCharacter(e.key)}))}focusLastNode(){const e=this.elements.menuItems.length-1,t=this.elements.menuItems[e];t.isSubmenuItem&&t.elements.toggle.isOpen?(this.currentChild=e,t.elements.childMenu.currentEvent=this.currentEvent,t.elements.childMenu.focusLastNode()):this.focusLastChild()}openChildren(){this.elements.submenuToggles.forEach((e=>e.preview()))}focusNextNodeWithCharacter(e){const t=e.toLowerCase(),n=function e(t){let n=[];return t.elements.menuItems.forEach((t=>{n.push(t),t.isSubmenuItem&&t.elements.toggle.isOpen&&(n=[...n,...e(t.elements.toggle.elements.controlledMenu)])})),n}(this.elements.rootMenu),s=n.indexOf(this.currentMenuItem)+1,l=[...n.slice(s),...n.slice(0,s)];let o=0,i=!1;for(;!i&&o<l.length;){let e="";if(e=l[o].dom.item.innerText?l[o].dom.item.innerText:l[o].dom.item.textContent,e=e.replace(/[\s]/g,"").toLowerCase().charAt(0),e===t){i=!0;const e=l[o].elements.parentMenu,t=e.elements.menuItems.indexOf(l[o]);this.elements.rootMenu.blurChildren(),e.focusChild(t)}o++}}focusParentsNextChild(){this.elements.parentMenu&&(this.elements.parentMenu.currentEvent=this.currentEvent,this.elements.parentMenu.currentChild===this.elements.parentMenu.elements.menuItems.length-1?(this.elements.parentMenu.blurCurrentChild(),this.elements.parentMenu.focusParentsNextChild()):(this.blurChildren(),this.elements.parentMenu.focusNextChild()))}focusChildsLastNode(){this.currentMenuItem.elements.childMenu.currentEvent=this.currentEvent,this.currentMenuItem.elements.childMenu.focusLastChild(),this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem&&this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle.isOpen&&(this.currentMenuItem.elements.childMenu.blurCurrentChild(),this.currentMenuItem.elements.childMenu.focusChildsLastNode())}}class d extends h{constructor(e){let{menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l=!1,childMenu:o=null,toggle:i=null,initialize:r=!0}=e;super({menuItemElement:t,menuLinkElement:n,parentMenu:s,isSubmenuItem:l,childMenu:o,toggle:i,initialize:!1}),r&&this.initialize()}}class p extends c{_dom={toggle:null,parent:null,container:null};constructor(e){let{menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l=null,initialize:o=!0}=e;super({menuToggleElement:t,parentElement:n,controlledMenu:s,parentMenu:l,initialize:!1}),this._dom.toggle=t,this._dom.parent=n,this._dom.container=s.isTopLevel?s.dom.container:s.dom.menu,o&&this.initialize()}initialize(){super.initialize(),this.dom.toggle.hasAttribute("data-toggle")&&this.dom.toggle.removeAttribute("data-toggle"),this.dom.toggle.hasAttribute("data-target")&&this.dom.toggle.removeAttribute("data-target")}_expand(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{openClass:t}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","true"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),e&&this.dom.toggle.dispatchEvent(this._expandEvent)}_collapse(){let e=!(arguments.length>0&&void 0!==arguments[0])||arguments[0];const{closeClass:t,openClass:n}=this.elements.controlledMenu;this.dom.toggle.setAttribute("aria-expanded","false"),""!==t&&("string"==typeof t?this.dom.container.classList.add(t):this.dom.container.classList.add(...t)),""!==n&&("string"==typeof n?this.dom.container.classList.remove(n):this.dom.container.classList.remove(...n)),e&&this.dom.toggle.dispatchEvent(this._collapseEvent)}}class g extends a{_MenuType=g;_MenuItemType=d;_MenuToggleType=p;constructor(e){let{menuElement:t,menuItemSelector:n=".nav-item",menuLinkSelector:s=".nav-link,.dropdown-item",submenuItemSelector:l=".dropdown",submenuToggleSelector:o=".dropdown-toggle",submenuSelector:i=".dropdown-menu",controllerElement:r=null,containerElement:u=null,openClass:m="show",closeClass:h="collapse",isTopLevel:c=!0,parentMenu:a=null,hoverType:d="off",hoverDelay:p=250,initialize:g=!0}=e;super({menuElement:t,menuItemSelector:n,menuLinkSelector:s,submenuItemSelector:l,submenuToggleSelector:o,submenuSelector:i,controllerElement:r,containerElement:u,openClass:m,closeClass:h,isTopLevel:c,parentMenu:a,hoverType:d,hoverDelay:p,initialize:!1}),g&&this.initialize()}}return g}();
 //# sourceMappingURL=treeview-bs4.min.js.map
diff --git a/dist/treeview-bs4.min.js.map b/dist/treeview-bs4.min.js.map
index ec727bf..84033b2 100644
--- a/dist/treeview-bs4.min.js.map
+++ b/dist/treeview-bs4.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"treeview-bs4.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/treeviewItem.js","../node_modules/accessible-menu/src/treeviewToggle.js","../node_modules/accessible-menu/src/treeview.js","../src/bootstrap4TreeviewItem.js","../src/bootstrap4TreeviewToggle.js","../src/bootstrap4Treeview.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","/* eslint-disable jsdoc/no-undefined-types */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","import BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu_hoverTypeType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base = this.dom.menu] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite = true]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu_hoverTypeType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu_hoverTypeDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Opens the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.open();\n          this.focusFirstChild();\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Menubar#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","/* eslint-disable jsdoc/no-undefined-types */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview;\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}     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+{"version":3,"file":"treeview-bs4.min.js","sources":["../node_modules/accessible-menu/src/validate.js","../node_modules/accessible-menu/src/_baseMenuToggle.js","../node_modules/accessible-menu/src/_baseMenuItem.js","../node_modules/accessible-menu/src/eventHandlers.js","../node_modules/accessible-menu/src/_baseMenu.js","../node_modules/accessible-menu/src/treeviewItem.js","../node_modules/accessible-menu/src/treeviewToggle.js","../node_modules/accessible-menu/src/treeview.js","../src/bootstrap4TreeviewItem.js","../src/bootstrap4TreeviewToggle.js","../src/bootstrap4Treeview.js"],"sourcesContent":["/**\n * Check to see if the provided elements have a specific contructor.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking instanceof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {object}  contructor - The constructor to check for.\n * @param  {object}  elements   - The element(s) to check.\n * @return {boolean}            - The result of the check.\n */\nexport function isValidInstance(contructor, elements) {\n  try {\n    if (typeof elements !== \"object\") {\n      const elementsType = typeof elements;\n\n      throw new TypeError(\n        `AccessibleMenu: Elements given to isValidInstance() must be inside of an object. ${elementsType} given.`\n      );\n    }\n\n    for (const key in elements) {\n      if (!(elements[key] instanceof contructor)) {\n        const elementType = typeof elements[key];\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be an instance of ${contructor.name}. ${elementType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are of a specific type.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * This is essentially just a wrapper function around checking typeof with\n * more descriptive error message to help debugging.\n *\n * Will return true is the check is successful.\n *\n * @param  {string}  type   - The type to check for.\n * @param  {object}  values - The value(s) to check.\n * @return {boolean}        - The result of the check.\n */\nexport function isValidType(type, values) {\n  try {\n    if (typeof values !== \"object\") {\n      const valuesType = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidType() must be inside of an object. ${valuesType} given.`\n      );\n    }\n\n    for (const key in values) {\n      const valueType = typeof values[key];\n\n      if (valueType !== type) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a ${type}. ${valueType} given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided values are valid CSS selectors.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isCSSSelector(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isCSSSelector() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      try {\n        if (values[key] === null) {\n          throw new Error();\n        }\n\n        document.querySelector(values[key]);\n      } catch (error) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be a valid CSS selector. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided value is either a string or an array of strings.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string, string[]>} values - The value(s) to check.\n * @return {boolean}                         - The result of the check.\n */\nexport function isValidClassList(values) {\n  try {\n    if (typeof values !== \"object\" || Array.isArray(values)) {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidClassList() must be inside of an object. ${type} given.`\n      );\n    }\n\n    for (const key in values) {\n      const type = typeof values[key];\n\n      if (type !== \"string\") {\n        if (Array.isArray(values[key])) {\n          values[key].forEach((value) => {\n            if (typeof value !== \"string\") {\n              throw new TypeError(\n                `AccessibleMenu: ${key} must be a string or an array of strings. An array containing non-strings given.`\n              );\n            }\n          });\n        } else {\n          throw new TypeError(\n            `AccessibleMenu: ${key} must be a string or an array of strings. ${type} given.`\n          );\n        }\n      } else {\n        const obj = {};\n        obj[key] = values[key];\n\n        isCSSSelector(obj);\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid focus states for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidState(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidState() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validStates = [\"none\", \"self\", \"child\"];\n\n    for (const key in values) {\n      if (!validStates.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validStates.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid event types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidEvent(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidEvent() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validEvents = [\"none\", \"mouse\", \"keyboard\", \"character\"];\n\n    for (const key in values) {\n      if (!validEvents.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validEvents.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Check to see if the provided values are valid hover types for a menu.\n *\n * The values must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * Will return true is the check is successful.\n *\n * @param  {Object<string>} values - The value(s) to check.\n * @return {boolean}                - The result of the check.\n */\nexport function isValidHoverType(values) {\n  try {\n    if (typeof values !== \"object\") {\n      const type = typeof values;\n\n      throw new TypeError(\n        `AccessibleMenu: Values given to isValidHoverType() must be inside of an object. ${type} given.`\n      );\n    }\n\n    const validTypes = [\"off\", \"on\", \"dynamic\"];\n\n    for (const key in values) {\n      if (!validTypes.includes(values[key])) {\n        throw new TypeError(\n          `AccessibleMenu: ${key} must be one of the following values: ${validTypes.join(\n            \", \"\n          )}. \"${values[key]}\" given.`\n        );\n      }\n    }\n\n    return true;\n  } catch (error) {\n    console.error(error);\n    return false;\n  }\n}\n\n/**\n * Checks to see if the provided elements are using a specific tag.\n *\n * The elements must be provided inside of an object\n * so the variable name can be retrieved in case of errors.\n *\n * @param  {string}               tagName  - The name of the tag.\n * @param  {Object<HTMLElement>} elements - The element(s) to check.\n * @return {boolean}                       - The result of the check.\n */\nexport function isTag(tagName, elements) {\n  if (\n    isValidType(\"string\", { tagName }) &&\n    isValidInstance(HTMLElement, elements)\n  ) {\n    const tag = tagName.toLowerCase();\n    let check = true;\n\n    for (const key in elements) {\n      if (elements[key].tagName.toLowerCase() !== tag) check = false;\n    }\n\n    return check;\n  } else {\n    return false;\n  }\n}\n\n/**\n * Checks to see if an event is supported by a node.\n *\n * @param  {string}      event   - The event type.\n * @param  {HTMLElement} element - The element to check.\n * @return {boolean}             - The result.\n *\n * @deprecated Will be removed in v4 unless there is a new found need for it.\n */\nexport function isEventSupported(event, element) {\n  if (\n    isValidType(\"string\", { event }) &&\n    isValidInstance(HTMLElement, { element })\n  ) {\n    const eventProp = `on${event}`;\n\n    return typeof element[eventProp] !== \"undefined\";\n  } else {\n    return false;\n  }\n}\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu */\n\nimport { isTag, isValidType } from \"./validate.js\";\n\n/**\n * A link or button that controls the visibility of a {@link BaseMenu}.\n */\nclass BaseMenuToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle - The menu toggle.\n   * @property {HTMLElement} parent - The menu containing this toggle.\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu toggle.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @property {BaseMenu} controlledMenu - The menu controlled by this toggle.\n   * @property {BaseMenu} parentMenu     - The menu containing this toggle.\n   */\n  _elements = {\n    controlledMenu: null,\n    parentMenu: null,\n  };\n\n  /**\n   * The open state of the menu toggle.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _open = false;\n\n  /**\n   * Expand event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuExpand\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _expandEvent = new CustomEvent(\"accessibleMenuExpand\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Collapse event.\n   *\n   * @protected\n   *\n   * @event accessibleMenuCollapse\n   *\n   * @type {CustomEvent}\n   *\n   * @property {Object<BaseMenuToggle>} details - The details object containing the BaseMenuToggle itself.\n   */\n  _collapseEvent = new CustomEvent(\"accessibleMenuCollapse\", {\n    bubbles: true,\n    detail: { toggle: this },\n  });\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {BaseMenu}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {BaseMenu|null} [options.parentMenu = null] - The menu containing this toggle.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n  }) {\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n\n    // Set menu elements.\n    this._elements.controlledMenu = controlledMenu;\n    this._elements.parentMenu = parentMenu;\n  }\n\n  /**\n   * Initializes the menu toggle.\n   *\n   * Initialize does a lot of setup on the menu toggle.\n   *\n   * The most basic setup steps are to ensure that the toggle has `aria-haspopup`\n   * set to \"true\", `aria-expanded` initially set to \"false\" and, if the toggle\n   * element is not a `<button>`, set the `role` to \"button\".\n   *\n   * The next step to the initialization is to ensure both the toggle and the\n   * menu it controlls have IDs.\n   *\n   * If they do not, the following steps take place:\n   * - Generate a random 10 character string,\n   * - Get the innerText of the toggle,\n   * - Set the toggle's ID to: `${toggle-inner-text}-${the-random-string}-menu-button`\n   * - Set the menu's ID to: `${toggle-inner-text}-${the-random-string}-menu`\n   *\n   * Once the ID's have been generated, the menu's `aria-labelledby` is set to\n   * the toggle's ID, and the toggle's `aria-controls` is set to the menu's ID.\n   *\n   * Finally, the collapse method is called to make sure the submenu is closed.\n   */\n  initialize() {\n    // Add WAI-ARIA properties.\n    this.dom.toggle.setAttribute(\"aria-haspopup\", \"true\");\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // If the toggle element is a button, there's no need to add a role.\n    if (!isTag(\"button\", { toggle: this.dom.toggle })) {\n      this.dom.toggle.setAttribute(\"role\", \"button\");\n    }\n\n    // Ensure both toggle and menu have IDs.\n    if (\n      this.dom.toggle.id === \"\" ||\n      this.elements.controlledMenu.dom.menu.id === \"\"\n    ) {\n      const randomString = Math.random()\n        .toString(36)\n        .replace(/[^a-z]+/g, \"\")\n        .substr(0, 10);\n\n      let id = this.dom.toggle.innerText.replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      let finalID = randomString;\n\n      if (\n        !id.replace(/\\s/g, \"\").length &&\n        this.dom.toggle.getAttribute(\"aria-label\")\n      ) {\n        id = this.dom.toggle\n          .getAttribute(\"aria-label\")\n          .replace(/[^a-zA-Z0-9\\s]/g, \"\");\n      }\n\n      if (id.replace(/\\s/g, \"\").length > 0) {\n        id = id.toLowerCase().replace(/\\s+/g, \"-\");\n\n        if (id.startsWith(\"-\")) {\n          id = id.substring(1);\n        }\n\n        if (id.endsWith(\"-\")) {\n          id = id.slice(0, -1);\n        }\n\n        finalID = `${id}-${finalID}`;\n      }\n\n      this.dom.toggle.id = this.dom.toggle.id || `${finalID}-menu-button`;\n      this.elements.controlledMenu.dom.menu.id =\n        this.elements.controlledMenu.dom.menu.id || `${finalID}-menu`;\n    }\n\n    // Set up proper aria label and control.\n    this.elements.controlledMenu.dom.menu.setAttribute(\n      \"aria-labelledby\",\n      this.dom.toggle.id\n    );\n    this.dom.toggle.setAttribute(\n      \"aria-controls\",\n      this.elements.controlledMenu.dom.menu.id\n    );\n\n    // Make sure the menu is collapsed on initialization, but do not emit the collapse event.\n    this._collapse(false);\n  }\n\n  /**\n   * Get the DOM elements within the toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * Get the declared accessible-menu elements within the menu toggle.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * Get the open state on the menu.\n   *\n   * @type {boolean}\n   *\n   * @see _open\n   */\n  get isOpen() {\n    return this._open;\n  }\n\n  set isOpen(value) {\n    isValidType(\"boolean\", { value });\n\n    this._open = value;\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"true\", adds the\n   * {@link BaseMenu#openClass|open class} to the toggle's parent menu item\n   * and controlled menu, and removed the {@link BaseMenu#closeClass|closed class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuExpand}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuExpand\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...openClass);\n      }\n    }\n\n    // Remove the close class.\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...closeClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Sets the toggle's `aria-expanded` to \"false\", adds the\n   * {@link BaseMenu#closeClass|closed class} to the toggle's parent menu item\n   * and controlled menu, and removes the {@link BaseMenu#openClass|open class}\n   * from the toggle's parent menu item and controlled menu.\n   *\n   * If `emit` is set to `true`, this will also emit a custom event\n   * called {@link accessibleMenuCollapse}\n   *\n   * @protected\n   *\n   * @fires accessibleMenuCollapse\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.add(closeClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.elements.controlledMenu.dom.menu.classList.remove(openClass);\n      } else {\n        this.elements.controlledMenu.dom.menu.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n\n  /**\n   * Opens the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\", calls {@link BaseMenuToggle#expand|expand},\n   * and sets the {@link BaseMenuToggle#isOpen|isOpen} value to `true`.\n   */\n  open() {\n    // Set proper focus state on the child.\n    this.elements.controlledMenu.focusState = \"self\";\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Opens the controlled menu without the current focus entering it.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"self\"\n   * and the parent menu's focus state to \"child\",\n   * and calls {@link BaseMenuToggle#expand|expand}.\n   */\n  preview() {\n    // Set proper focus state on the parent.\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.focusState = \"self\";\n    }\n\n    // Expand the controlled menu.\n    this._expand();\n\n    // Set the open flag.\n    this.isOpen = true;\n  }\n\n  /**\n   * Closes the controlled menu.\n   *\n   * Sets the controlled menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and the parent menu's focus state to \"self\", blurs the controlled menu\n   * and sets it's {@link BaseMenu#currentChild|current child index} to 0,\n   * calls {@link BaseMenuToggle#collapse|collapse}, and sets\n   * the {@link BaseMenuToggle#isOpen|isOpen} value to `false`.\n   */\n  close() {\n    if (this.isOpen) {\n      // Reset controlled menu.\n      this.elements.controlledMenu.currentChild = 0;\n      this.elements.controlledMenu.blur();\n\n      // Set proper focus states on the parent.\n      if (this.elements.parentMenu) {\n        this.elements.parentMenu.focusState = \"self\";\n      }\n\n      // Collapse the controlled menu.\n      this._collapse();\n\n      // Set the open flag.\n      this.isOpen = false;\n    }\n  }\n\n  /**\n   * Toggles the open state of the controlled menu between `true` and `false`.\n   */\n  toggle() {\n    if (this.isOpen) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  /**\n   * Closes all sibling menus.\n   */\n  closeSiblings() {\n    if (this.elements.parentMenu) {\n      this.elements.parentMenu.elements.submenuToggles.forEach((toggle) => {\n        if (toggle !== this) toggle.close();\n      });\n    }\n  }\n\n  /**\n   * Closes all child menus.\n   */\n  closeChildren() {\n    this.elements.controlledMenu.elements.submenuToggles.forEach((toggle) =>\n      toggle.close()\n    );\n  }\n}\n\nexport default BaseMenuToggle;\n","// eslint-disable-next-line no-unused-vars\n/* global BaseMenu BaseMenuToggle */\n\n/**\n * A basic navigation link contained inside of a {@link BaseMenu}.\n */\nclass BaseMenuItem {\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @protected\n   *\n   * @property {HTMLElement} item - The menu item.\n   * @property {HTMLElement} link - The menu item's link.\n   */\n  _dom = {\n    item: null,\n    link: null,\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @protected\n   *\n   * @property {BaseMenu}        parentMenu - The menu containing this menu item.\n   * @property {?BaseMenu}       childMenu  - The menu contained within this menu item.\n   * @property {?BaseMenuToggle} toggle     - The menu toggle within this menu item that controls the `childMenu`.\n   */\n  _elements = {\n    parentMenu: null,\n    childMenu: null,\n    toggle: null,\n  };\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   */\n  _submenu = false;\n\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}          options                         - The options for generating the menu item.\n   * @param {HTMLElement}     options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}     options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {BaseMenu}        options.parentMenu              - The parent menu.\n   * @param {boolean}         [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {?BaseMenu}       [options.childMenu = null]      - The child menu.\n   * @param {?BaseMenuToggle} [options.toggle = null]         - The controller for the child menu.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n  }) {\n    // Set DOM elements.\n    this._dom.item = menuItemElement;\n    this._dom.link = menuLinkElement;\n\n    // Set menu elements.\n    this._elements.parentMenu = parentMenu;\n    this._elements.childMenu = childMenu;\n    this._elements.toggle = toggle;\n\n    this._submenu = isSubmenuItem;\n  }\n\n  /**\n   * Initialize the menu item.\n   */\n  initialize() {}\n\n  /**\n   * The DOM elements within the menu item.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @readonly\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu item.\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle>}\n   *\n   * @readonly\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * A flag marking a submenu item.\n   *\n   * @type {boolean}\n   *\n   * @readonly\n   *\n   * @see _submenu\n   */\n  get isSubmenuItem() {\n    return this._submenu;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  focus() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.focus();\n    }\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link BaseMenu#shouldFocus|shouldFocus} value is `true`.\n   */\n  blur() {\n    if (this.elements.parentMenu.shouldFocus) {\n      this.dom.link.blur();\n    }\n  }\n}\n\nexport default BaseMenuItem;\n","/**\n * Retrieves the pressed key from an event.\n *\n * @param   {KeyboardEvent} event - The keyboard event.\n * @return  {string}              - The name of the key or an empty string.\n */\nexport function keyPress(event) {\n  try {\n    // Use event.key or event.keyCode to support older browsers.\n    const key = event.key || event.keyCode;\n    const keys = {\n      Enter: key === \"Enter\" || key === 13,\n      Space: key === \" \" || key === \"Spacebar\" || key === 32,\n      Escape: key === \"Escape\" || key === \"Esc\" || key === 27,\n      ArrowUp: key === \"ArrowUp\" || key === \"Up\" || key === 38,\n      ArrowRight: key === \"ArrowRight\" || key === \"Right\" || key === 39,\n      ArrowDown: key === \"ArrowDown\" || key === \"Down\" || key === 40,\n      ArrowLeft: key === \"ArrowLeft\" || key === \"Left\" || key === 37,\n      Home: key === \"Home\" || key === 36,\n      End: key === \"End\" || key === 35,\n      Character: isNaN(key) && !!key.match(/^[a-zA-Z]{1}$/),\n      Tab: key === \"Tab\" || key === 9,\n      Asterisk: key === \"*\" || key === 56,\n    };\n\n    return Object.keys(keys).find((key) => keys[key] === true) || \"\";\n  } catch (error) {\n    // Return an empty string if something goes wrong.\n    return \"\";\n  }\n}\n\n/**\n * Stops an event from taking action.\n *\n * @param {Event} event - The event.\n */\nexport function preventEvent(event) {\n  event.preventDefault();\n  event.stopPropagation();\n}\n","// eslint-disable-next-line no-unused-vars\n/* global DisclosureMenu, Menubar, Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\nimport BaseMenuItem from \"./_baseMenuItem.js\";\nimport {\n  isValidInstance,\n  isValidType,\n  isCSSSelector,\n  isValidClassList,\n  isValidState,\n  isValidEvent,\n  isValidHoverType,\n} from \"./validate.js\";\nimport { preventEvent, keyPress } from \"./eventHandlers.js\";\n\n/**\n * An accessible navigation element in the DOM.\n *\n * This is intended to be used as a \"base\" to other menus and not to be used on\n * it's own in the DOM.\n *\n * Use a {@link DisclosureMenu}, {@link Menubar}, or {@link Treeview} instead.\n */\nclass BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenu}\n   */\n  _MenuType = BaseMenu; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuItem}\n   */\n  _MenuItemType = BaseMenuItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof BaseMenuToggle}\n   */\n  _MenuToggleType = BaseMenuToggle;\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @property {HTMLElement}   menu           - The menu element.\n   * @property {HTMLElement[]} menuItems      - An array of menu items.\n   * @property {HTMLElement[]} submenuItems   - An array of menu items that also contain submenu elements.\n   * @property {HTMLElement[]} submenuToggles - An array of menu links that function as submenu toggles.\n   * @property {HTMLElement[]} submenus       - An array of submenu elements.\n   * @property {HTMLElement}   controller     - The toggle for this menu.\n   * @property {HTMLElement}   container      - The container for this menu.\n   */\n  _dom = {\n    menu: null,\n    menuItems: [],\n    submenuItems: [],\n    submenuToggles: [],\n    submenus: [],\n    controller: null,\n    container: null,\n  };\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @protected\n   *\n   * @type {Object<string>}\n   *\n   * @property {string} menuItems      - The CSS selector for menu items.\n   * @property {string} menuLinks      - The CSS selector for menu links.\n   * @property {string} submenuItems   - The CSS selector for menu items containing submenus.\n   * @property {string} submenuToggles - The CSS selector for menu links that function as submenu toggles.\n   * @property {string} submenus       - The CSS selector for for submenus.\n   */\n  _selectors = {\n    menuItems: \"\",\n    menuLinks: \"\",\n    submenuItems: \"\",\n    submenuToggles: \"\",\n    submenus: \"\",\n  };\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @protected\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @property {BaseMenuItem[]}   menuItems      - An array of menu items.\n   * @property {BaseMenuToggle[]} submenuToggles - An array of menu toggles.\n   * @property {?BaseMenuToggle}  controller     - A menu toggle that controls this menu.\n   * @property {?BaseMenu}        parentMenu     - The parent menu.\n   * @property {?BaseMenu}        rootMenu       - The root menu of the menu tree.\n   */\n  _elements = {\n    menuItems: [],\n    submenuToggles: [],\n    controller: null,\n    parentMenu: null,\n    rootMenu: null,\n  };\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _openClass = \"show\";\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * @protected\n   *\n   * @type {string|string[]}\n   */\n  _closeClass = \"hide\";\n\n  /**\n   * A flag marking the root menu.\n   *\n   * @protected\n   *\n   * @type {boolean}\n   */\n  _root = true;\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _currentChild = 0;\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _focusState = \"none\";\n\n  /**\n   * This last event triggered on the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _currentEvent = \"none\";\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * @protected\n   *\n   * @type {string}\n   */\n  _hoverType = \"off\";\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * @protected\n   *\n   * @type {number}\n   */\n  _hoverDelay = 250;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector]      - The CSS selector string for submenus.\n   * @param {?HTMLElement}           [options.controllerElement]  - The element controlling the menu in the DOM.\n   * @param {?HTMLElement}           [options.containerElement]   - The element containing the menu in the DOM.\n   * @param {?(string|string[])}     [options.openClass]          - The class to apply when a menu is \"open\".\n   * @param {?(string|string[])}     [options.closeClass]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel]        - A flag to mark the root menu.\n   * @param {?BaseMenu}              [options.parentMenu]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n  }) {\n    // Set DOM elements.\n    this._dom.menu = menuElement;\n    this._dom.controller = controllerElement;\n    this._dom.container = containerElement;\n\n    // Set DOM selectors.\n    this._selectors.menuItems = menuItemSelector;\n    this._selectors.menuLinks = menuLinkSelector;\n    this._selectors.submenuItems = submenuItemSelector;\n    this._selectors.submenuToggles = submenuToggleSelector;\n    this._selectors.submenus = submenuSelector;\n\n    // Set menu elements.\n    this._elements.menuItems = [];\n    this._elements.submenuToggles = [];\n    this._elements.controller = null;\n    this._elements.parentMenu = parentMenu;\n    this._elements.rootMenu = isTopLevel ? this : null;\n\n    // Set open/close classes.\n    this._openClass = openClass || \"\";\n    this._closeClass = closeClass || \"\";\n\n    // Set root.\n    this._root = isTopLevel;\n\n    // Set hover settings.\n    this._hoverType = hoverType;\n    this._hoverDelay = hoverDelay;\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * The following steps will be taken to initialize the menu:\n   * - {@link BaseMenu#validate|Validate} that the menu can initialize,\n   * - find the root menu of the menu tree if it isn't already set,\n   * - populate all DOM elements within the {@link BaseMenu#dom|dom},\n   * - if the current menu is the root menu _and_ has a controller, initialize\n   *   the controller, and\n   * - populate the menu elements within the {@link BaseMenu#elements|elements}\n   *\n   * @throws {Error} Will throw an Error if validate returns `false`.\n   */\n  initialize() {\n    if (!this._validate()) {\n      throw new Error(\n        \"AccesibleMenu: cannot initialize menu. See other error messages for more information.\"\n      );\n    }\n\n    // Get the root menu if it doesn't exist.\n    if (this.elements.rootMenu === null) this._findRootMenu(this);\n\n    // Set all of the DOM elements.\n    this._setDOMElements();\n\n    if (this.isTopLevel) {\n      if (this.dom.controller && this.dom.container) {\n        // Create a new BaseMenuToggle to control the menu.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: this.dom.controller,\n          parentElement: this.dom.container,\n          controlledMenu: this,\n        });\n\n        this._elements.controller = toggle;\n      }\n    }\n\n    this._createChildElements();\n  }\n\n  /**\n   * The DOM elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<HTMLElement, HTMLElement[]>}\n   *\n   * @see _dom\n   */\n  get dom() {\n    return this._dom;\n  }\n\n  /**\n   * The CSS selectors used by the menu to populate the {@link BaseMenu#dom|dom}.\n   *\n   * @readonly\n   *\n   * @type {Object<string>}\n   *\n   * @see _selectors\n   */\n  get selectors() {\n    return this._selectors;\n  }\n\n  /**\n   * The declared accessible-menu elements within the menu.\n   *\n   * @readonly\n   *\n   * @type {Object<BaseMenu, BaseMenuToggle, BaseMenuItem[], BaseMenuToggle[]>}\n   *\n   * @see _elements\n   */\n  get elements() {\n    return this._elements;\n  }\n\n  /**\n   * The flag marking the root menu.\n   *\n   * @readonly\n   *\n   * @type {boolean}\n   *\n   * @see _root\n   */\n  get isTopLevel() {\n    return this._root;\n  }\n\n  /**\n   * The class(es) to apply when the menu is open.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's open class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _openClass\n   */\n  get openClass() {\n    return this.isTopLevel ? this._openClass : this.elements.rootMenu.openClass;\n  }\n\n  /**\n   * The class(es) to apply when the menu is closed.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's close class(es).\n   *\n   * @type {string|string[]}\n   *\n   * @see _closeClass\n   */\n  get closeClass() {\n    return this.isTopLevel\n      ? this._closeClass\n      : this.elements.rootMenu.closeClass;\n  }\n\n  /**\n   * The index of the currently selected {@link BaseMenuItem|menu item} in the menu.\n   *\n   * - Attempting to set a value less than -1 will set the current child to -1.\n   * - Attempting to set a value greater than or equal to the number of menu items\n   *   will set the current child to the index of the last menu item in the menu.\n   *\n   * If the current menu has a parent menu _and_ the menu's\n   * {@link BaseMenu#currentEvent|current event} is \"mouse\", The parent menu\n   * will have it's current child updated as well to help with transitioning\n   * between mouse and keyboard naviation.\n   *\n   * @type {number}\n   *\n   * @see _currentChild\n   */\n  get currentChild() {\n    return this._currentChild;\n  }\n\n  /**\n   * The current state of the menu's focus.\n   *\n   * - If the menu has submenus, setting the focus state to \"none\" or \"self\" will\n   *   update all child menus to have the focus state of \"none\".\n   * - If the menu has a parent menu, setting the focus state to \"self\" or \"child\"\n   *   will update all parent menus to have the focus state of \"child\".\n   *\n   * @type {string}\n   *\n   * @see _focusState\n   */\n  get focusState() {\n    return this._focusState;\n  }\n\n  /**\n   * The last event triggered on the menu.\n   *\n   * @type {string}\n   *\n   * @see _currentEvent\n   */\n  get currentEvent() {\n    return this._currentEvent;\n  }\n\n  /**\n   * The currently selected menu item.\n   *\n   * @type {BaseMenuItem}\n   */\n  get currentMenuItem() {\n    return this.elements.menuItems[this.currentChild];\n  }\n\n  /**\n   * The type of hoverability for the menu.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hoverability.\n   *\n   * @type {string}\n   *\n   * @see _hoverType\n   */\n  get hoverType() {\n    return this._root ? this._hoverType : this.elements.rootMenu.hoverType;\n  }\n\n  /**\n   * The delay time (in miliseconds) used for mouseout events to take place.\n   *\n   * This functions differently for root vs. submenus.\n   * Submenus will always inherit their root menu's hover delay.\n   *\n   * @type {number}\n   *\n   * @see _hoverDelay\n   */\n  get hoverDelay() {\n    return this._root ? this._hoverDelay : this.elements.rootMenu.hoverDelay;\n  }\n\n  /**\n   * A flag to check if the menu's focus methods should _actually_ move the focus in the DOM.\n   *\n   * This will be `false` unless any of the following criteria are met:\n   * - The menu's {@link BaseMenu#currentEvent|current event} is \"keyboard\".\n   * - The menu's current event is \"character\".\n   * - The menu's current event is \"mouse\" _and_ the menu's\n   *   {@link BaseMenu#_hoverType|hover type} is \"dynamic\".\n   *\n   * @type {boolean}\n   */\n  get shouldFocus() {\n    let check = false;\n\n    if (this.currentEvent === \"keyboard\" || this.currentEvent === \"character\") {\n      check = true;\n    }\n\n    if (this.currentEvent === \"mouse\" && this.hoverType === \"dynamic\") {\n      check = true;\n    }\n\n    return check;\n  }\n\n  set openClass(value) {\n    isValidClassList({ openClass: value });\n\n    if (this._openClass !== value) {\n      this._openClass = value;\n    }\n  }\n\n  set closeClass(value) {\n    isValidClassList({ closeClass: value });\n\n    if (this._closeClass !== value) {\n      this._closeClass = value;\n    }\n  }\n\n  set currentChild(value) {\n    isValidType(\"number\", { value });\n\n    /**\n     * Update the parent menu's current child to make sure clicks\n     * and other jumps don't interfere with keyboard navigation.\n     *\n     * @param {BaseMenu} menu - The initial menu.\n     */\n    function setParentChild(menu) {\n      const updateEvents = [\"mouse\", \"character\"];\n\n      if (\n        updateEvents.includes(menu.currentEvent) &&\n        menu.elements.parentMenu\n      ) {\n        let index = 0;\n        let found = false;\n\n        while (\n          !found &&\n          index < menu.elements.parentMenu.elements.menuItems.length\n        ) {\n          const menuItem = menu.elements.parentMenu.elements.menuItems[index];\n\n          if (\n            menuItem.isSubmenuItem &&\n            menuItem.elements.toggle.elements.controlledMenu === menu\n          ) {\n            found = true;\n\n            menu.elements.parentMenu.currentEvent = menu.currentEvent;\n            menu.elements.parentMenu.currentChild = index;\n          }\n\n          index++;\n        }\n      }\n    }\n\n    if (value < -1) {\n      this._currentChild = -1;\n      setParentChild(this);\n    } else if (value >= this.elements.menuItems.length) {\n      this._currentChild = this.elements.menuItems.length - 1;\n      setParentChild(this);\n    } else if (this.focusChild !== value) {\n      this._currentChild = value;\n      setParentChild(this);\n    }\n  }\n\n  set focusState(value) {\n    isValidState({ value });\n\n    if (this._focusState !== value) {\n      this._focusState = value;\n    }\n\n    if (\n      this.elements.submenuToggles.length > 0 &&\n      (value === \"self\" || value === \"none\")\n    ) {\n      this.elements.submenuToggles.forEach((toggle) => {\n        toggle.elements.controlledMenu.focusState = \"none\";\n      });\n    }\n\n    if (this.elements.parentMenu && (value === \"self\" || value === \"child\")) {\n      this.elements.parentMenu.focusState = \"child\";\n    }\n  }\n\n  set currentEvent(value) {\n    isValidEvent({ value });\n\n    if (this._currentEvent !== value) {\n      this._currentEvent = value;\n\n      if (this.elements.submenuToggles.length > 0) {\n        this.elements.submenuToggles.forEach((submenuToggle) => {\n          submenuToggle.elements.controlledMenu.currentEvent = value;\n        });\n      }\n    }\n  }\n\n  set hoverType(value) {\n    isValidHoverType({ value });\n\n    if (this._hoverType !== value) {\n      this._hoverType = value;\n    }\n  }\n\n  set hoverDelay(value) {\n    isValidType(\"number\", { value });\n\n    if (this._hoverDelay !== value) {\n      this._hoverDelay = value;\n    }\n  }\n\n  /**\n   * Validates all aspects of the menu to ensure proper functionality.\n   *\n   * @protected\n   *\n   * @return {boolean} - The result of the validation.\n   */\n  _validate() {\n    let check = true;\n\n    if (this._dom.container !== null || this._dom.controller !== null) {\n      if (\n        !isValidInstance(HTMLElement, {\n          menuElement: this._dom.menu,\n          controllerElement: this._dom.controller,\n          containerElement: this._dom.container,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isValidInstance(HTMLElement, {\n        menuElement: this._dom.menu,\n      })\n    ) {\n      check = false;\n    }\n\n    if (this._selectors.submenuItems !== \"\") {\n      if (\n        !isCSSSelector({\n          menuItemSelector: this._selectors.menuItems,\n          menuLinkSelector: this._selectors.menuLinks,\n          submenuItemSelector: this._selectors.submenuItems,\n          submenuToggleSelector: this._selectors.submenuToggles,\n          submenuSelector: this._selectors.submenus,\n        })\n      ) {\n        check = false;\n      }\n    } else if (\n      !isCSSSelector({\n        menuItemSelector: this._selectors.menuItems,\n        menuLinkSelector: this._selectors.menuLinks,\n      })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._openClass !== \"\" &&\n      !isValidClassList({ openClass: this._openClass })\n    ) {\n      check = false;\n    }\n\n    if (\n      this._closeClass !== \"\" &&\n      !isValidClassList({ closeClass: this._closeClass })\n    ) {\n      check = false;\n    }\n\n    if (!isValidType(\"boolean\", { isTopLevel: this._root })) {\n      check = false;\n    }\n\n    if (\n      this._elements.parentMenu !== null &&\n      !isValidInstance(BaseMenu, { parentMenu: this._elements.parentMenu })\n    ) {\n      check = false;\n    }\n\n    if (!isValidHoverType({ hoverType: this._hoverType })) {\n      check = false;\n    }\n\n    if (!isValidType(\"number\", { hoverDelay: this._hoverDelay })) {\n      check = false;\n    }\n\n    return check;\n  }\n\n  /**\n   * Sets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be set through this method.\n   *\n   * @protected\n   *\n   * @param {string}      elementType            - The type of element to populate.\n   * @param {HTMLElement} [base] - The element used as the base for the querySelect.\n   * @param {boolean}     [overwrite]     - A flag to set if the existing elements will be overwritten.\n   */\n  _setDOMElementType(elementType, base = this.dom.menu, overwrite = true) {\n    if (typeof this.selectors[elementType] === \"string\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be set through _setDOMElementType.`\n        );\n      }\n\n      if (base !== this.dom.menu) isValidInstance(HTMLElement, { base });\n\n      // Get the all elements matching the selector in the base.\n      const domElements = Array.from(\n        base.querySelectorAll(this.selectors[elementType])\n      );\n\n      // Filter the elements so only direct children of the base are kept.\n      const filteredElements = domElements.filter(\n        (item) => item.parentElement === base\n      );\n\n      if (overwrite) {\n        this._dom[elementType] = filteredElements;\n      } else {\n        this._dom[elementType] = [\n          ...this._dom[elementType],\n          ...filteredElements,\n        ];\n      }\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Resets DOM elements within the menu.\n   *\n   * Elements that are not stored inside an array cannot be reset through this method.\n   *\n   * @protected\n   *\n   * @param {string} elementType - The type of element to clear.\n   */\n  _resetDOMElementType(elementType) {\n    if (typeof this.dom[elementType] !== \"undefined\") {\n      if (!Array.isArray(this.dom[elementType])) {\n        throw new Error(\n          `AccessibleMenu: The \"${elementType}\" element cannot be reset through _resetDOMElementType.`\n        );\n      }\n\n      this._dom[elementType] = [];\n    } else {\n      throw new Error(\n        `AccessibleMenu: \"${elementType}\" is not a valid element type within the menu.`\n      );\n    }\n  }\n\n  /**\n   * Sets all DOM elements within the menu.\n   *\n   * Utiliizes {@link BaseMenu#_setDOMElementType|_setDOMElementType} and\n   * {@link BaseMenu#_resetDOMElementType|_resetDOMElementType}.\n   *\n   * @protected\n   */\n  _setDOMElements() {\n    this._setDOMElementType(\"menuItems\");\n\n    if (this.selectors.submenuItems !== \"\") {\n      this._setDOMElementType(\"submenuItems\");\n\n      this._resetDOMElementType(\"submenuToggles\");\n      this._resetDOMElementType(\"submenus\");\n\n      this.dom.submenuItems.forEach((item) => {\n        this._setDOMElementType(\"submenuToggles\", item, false);\n        this._setDOMElementType(\"submenus\", item, false);\n      });\n    }\n  }\n\n  /**\n   * Finds the root menu element.\n   *\n   * @protected\n   *\n   * @param {BaseMenu} menu - The menu to check.\n   */\n  _findRootMenu(menu) {\n    if (menu.isTopLevel) {\n      this._elements.rootMenu = menu;\n    } else if (menu.elements.parentMenu !== null) {\n      this._findRootMenu(menu.elements.parentMenu);\n    } else {\n      throw new Error(\"Cannot find root menu.\");\n    }\n  }\n\n  /**\n   * Creates and initializes all menu items and submenus.\n   *\n   * @protected\n   */\n  _createChildElements() {\n    this.dom.menuItems.forEach((element) => {\n      let menuItem;\n\n      if (this.dom.submenuItems.includes(element)) {\n        // The menu's toggle controller DOM element.\n        const toggler = element.querySelector(this.selectors.submenuToggles);\n        // The actual menu DOM element.\n        const submenu = element.querySelector(this.selectors.submenus);\n\n        // Create the new menu and initialize it.\n        const menu = new this._MenuType({\n          menuElement: submenu,\n          menuItemSelector: this.selectors.menuItems,\n          menuLinkSelector: this.selectors.menuLinks,\n          submenuItemSelector: this.selectors.submenuItems,\n          submenuToggleSelector: this.selectors.submenuToggles,\n          submenuSelector: this.selectors.submenus,\n          openClass: this.openClass,\n          closeClass: this.closeClass,\n          isTopLevel: false,\n          parentMenu: this,\n          hoverType: this.hoverType,\n          hoverDelay: this.hoverDelay,\n        });\n\n        // Create the new menu toggle.\n        const toggle = new this._MenuToggleType({\n          menuToggleElement: toggler,\n          parentElement: element,\n          controlledMenu: menu,\n          parentMenu: this,\n        });\n\n        // Add the toggle to the list of toggles.\n        this._elements.submenuToggles.push(toggle);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: toggler,\n          parentMenu: this,\n          isSubmenuItem: true,\n          childMenu: menu,\n          toggle,\n        });\n      } else {\n        const link = element.querySelector(this.selectors.menuLinks);\n\n        // Create a new menu item.\n        menuItem = new this._MenuItemType({\n          menuItemElement: element,\n          menuLinkElement: link,\n          parentMenu: this,\n        });\n      }\n\n      this._elements.menuItems.push(menuItem);\n    });\n  }\n\n  /**\n   * Handles focus events throughout the menu for proper menu use.\n   *\n   * - Adds a `focus` listener to every menu item so when it gains focus,\n   *   it will set the item's containing menu's {@link BaseMenu#focusState|focus state}\n   *   to \"self\".\n   *\n   * @protected\n   */\n  _handleFocus() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"focus\", () => {\n        this.focusState = \"self\";\n        this.currentChild = index;\n      });\n    });\n  }\n\n  /**\n   * Handles click events throughout the menu for proper use.\n   *\n   * - Adds a `pointerdown` listener to every menu item that will blur\n   *   all menu items in the entire menu structure (starting at the root menu) and\n   *   then properly focus the clicked item.\n   * - Adds a `pointerup` listener to every submenu item that will properly\n   *   toggle the submenu open/closed.\n   * - Adds a `pointerup` listener to the menu's controller\n   *   (if the menu is the root menu) so when it is clicked it will properly\n   *   toggle open/closed.\n   *\n   * @protected\n   */\n  _handleClick() {\n    /**\n     * Toggles a toggle element.\n     *\n     * @param {BaseMenu}       menu   - This menu.\n     * @param {BaseMenuToggle} toggle - The menu toggle\n     * @param {Event}          event  - A Javascript event.\n     */\n    function toggleToggle(menu, toggle, event) {\n      preventEvent(event);\n\n      toggle.toggle();\n\n      if (toggle.isOpen) {\n        menu.focusState = \"self\";\n        toggle.elements.controlledMenu.focusState = \"none\";\n      }\n    }\n\n    this.elements.menuItems.forEach((item, index) => {\n      // Properly focus the current menu item.\n      item.dom.link.addEventListener(\n        \"pointerdown\",\n        () => {\n          this.currentEvent = \"mouse\";\n          this.elements.rootMenu.blurChildren();\n          this.focusChild(index);\n        },\n        { passive: true }\n      );\n\n      // Properly toggle submenus open and closed.\n      if (item.isSubmenuItem) {\n        item.elements.toggle.dom.toggle.addEventListener(\n          \"pointerup\",\n          (event) => {\n            this.currentEvent = \"mouse\";\n            toggleToggle(this, item.elements.toggle, event);\n          }\n        );\n      }\n    });\n\n    // Open the this menu if it's controller is clicked.\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"pointerup\",\n        (event) => {\n          this.currentEvent = \"mouse\";\n          toggleToggle(this, this.elements.controller, event);\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles hover events throughout the menu for proper use.\n   *\n   * Adds `pointerenter` listeners to all menu items and `pointerleave` listeners\n   * to all submenu items which function differently depending on\n   * the menu's {@link BaseMenu#_hoverType|hover type}.\n   *\n   * Before executing anything, the event is checked to make sure the event wasn't\n   * triggered by a pen or touch.\n   *\n   * <strong>Hover Type \"on\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   {@link BaseMenu#currentChild| current child} value will change to that\n   *   menu item.\n   * - When a `pointerenter` event triggers on a submenu item the\n   *   {@link BaseMenuToggle#preview|preview method} for the submenu item's\n   *   toggle will be called.\n   * - When a `pointerleave` event triggers on an open submenu item the\n   *   {@link BaseMenuToggle#close|close method} for the submenu item's toggle\n   *   will be called after a delay set by the menu's {@link BaseMenu#_hoverDelay|hover delay}.\n   *\n   * <strong>Hover Type \"dynamic\"</strong>\n   * - When a `pointerenter` event triggers on any menu item the menu's\n   *   current child value will change to that menu item.\n   * - When a `pointerenter` event triggers on any menu item, and the menu's\n   *   {@link BaseMenu#focusState|focus state} is not \"none\", the menu item\n   *   will be focused.\n   * - When a `pointerenter` event triggers on a submenu item, and a submenu is\n   *   already open, the preview method for the submenu item's toggle will be called.\n   * - When a `pointerenter` event triggers on a submenu item, and no submenu is\n   *   open, no submenu-specific methods will be called.\n   * - When a `pointerleave` event triggers on an open submenu item that is not a\n   *   root-level submenu item the close method for the submenu item's toggle\n   *   will be called and the submenu item will be focused after a delay set by\n   *   the menu's hover delay.\n   * - When a `pointerleave` event triggers on an open submenu item that is a\n   *   root-level submenu item no submenu-specific methods will be called.\n   *\n   * <strong>Hover Type \"off\"</strong>\n   * All `pointerenter` and `pointerleave` events are ignored.\n   *\n   * @protected\n   */\n  _handleHover() {\n    this.elements.menuItems.forEach((menuItem, index) => {\n      menuItem.dom.link.addEventListener(\"pointerenter\", (event) => {\n        // Exit out of the event if it was not made by a mouse.\n        if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n          return;\n        }\n\n        if (this.hoverType === \"on\") {\n          this.currentEvent = \"mouse\";\n          this.currentChild = index;\n\n          if (menuItem.isSubmenuItem) {\n            menuItem.elements.toggle.preview();\n          }\n        } else if (this.hoverType === \"dynamic\") {\n          const isOpen = this.elements.submenuToggles.some(\n            (toggle) => toggle.isOpen\n          );\n          this.currentChild = index;\n\n          if (!this.isTopLevel || this.focusState !== \"none\") {\n            this.currentEvent = \"mouse\";\n            this.focusCurrentChild();\n          }\n\n          if (menuItem.isSubmenuItem && (!this.isTopLevel || isOpen)) {\n            this.currentEvent = \"mouse\";\n            menuItem.elements.toggle.preview();\n          }\n        }\n      });\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.dom.item.addEventListener(\"pointerleave\", (event) => {\n          // Exit out of the event if it was not made by a mouse.\n          if (event.pointerType === \"pen\" || event.pointerType === \"touch\") {\n            return;\n          }\n\n          if (this.hoverType === \"on\") {\n            if (this.hoverDelay > 0) {\n              setTimeout(() => {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n              }, this.hoverDelay);\n            } else {\n              this.currentEvent = \"mouse\";\n              menuItem.elements.toggle.close();\n            }\n          } else if (this.hoverType === \"dynamic\") {\n            if (!this.isTopLevel) {\n              if (this.hoverDelay > 0) {\n                setTimeout(() => {\n                  this.currentEvent = \"mouse\";\n                  menuItem.elements.toggle.close();\n                  this.focusCurrentChild();\n                }, this.hoverDelay);\n              } else {\n                this.currentEvent = \"mouse\";\n                menuItem.elements.toggle.close();\n                this.focusCurrentChild();\n              }\n            }\n          }\n        });\n      }\n    });\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assit the {@link BaseMenu#_handleKeyup|_handleKeyup method}.\n   *\n   * - Adds a `keydown` listener to the menu's controller (if the menu is the root menu).\n   *   - Blocks propagation on \"Space\", \"Enter\", and \"Escape\" keys.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\n        \"keydown\",\n        (event) => {\n          this.currentEvent = \"keyboard\";\n\n          const key = keyPress(event);\n\n          if (key === \"Space\" || key === \"Enter\") {\n            preventEvent(event);\n          }\n        }\n      );\n    }\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * - Adds a `keyup` listener to the menu's controller (if the menu is the root menu).\n   *   - Toggles the menu when the user hits \"Space\" or \"Enter\".\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    if (this.isTopLevel && this.elements.controller) {\n      this.elements.controller.dom.toggle.addEventListener(\"keyup\", (event) => {\n        this.currentEvent = \"keyboard\";\n\n        const key = keyPress(event);\n\n        if (key === \"Space\" || key === \"Enter\") {\n          preventEvent(event);\n          this.elements.controller.toggle();\n\n          // If the menu is open, focus the first child.\n          if (this.elements.controller.isOpen) {\n            this.focusFirstChild();\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Focus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"self\" and\n   * focusses the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * value is `true`.\n   */\n  focus() {\n    this.focusState = \"self\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.focus();\n    }\n  }\n\n  /**\n   * Unfocus the menu.\n   *\n   * Sets the menu's {@link BaseMenu#focusState|focus state} to \"none\"\n   * and blurs the menu if the menu's {@link BaseMenu#shouldFocus|shouldFocus}\n   * vallue is `true`.\n   */\n  blur() {\n    this.focusState = \"none\";\n\n    if (this.shouldFocus) {\n      this.dom.menu.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's current child.\n   */\n  focusCurrentChild() {\n    this.focusState = \"self\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.focus();\n    }\n  }\n\n  /**\n   * Focuses the menu's child at a given index.\n   *\n   * @param {number} index - The index of the child to focus.\n   */\n  focusChild(index) {\n    this.blurCurrentChild();\n    this.currentChild = index;\n    this.focusCurrentChild();\n  }\n\n  /**\n   * Focues the menu's first child.\n   */\n  focusFirstChild() {\n    this.focusChild(0);\n  }\n\n  /**\n   * Focus the menu's last child.\n   */\n  focusLastChild() {\n    this.focusChild(this.elements.menuItems.length - 1);\n  }\n\n  /**\n   * Focus the menu's next child.\n   */\n  focusNextChild() {\n    if (this.currentChild < this.elements.menuItems.length - 1) {\n      this.focusChild(this.currentChild + 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Focus the menu's previous child.\n   */\n  focusPreviousChild() {\n    if (this.currentChild > 0) {\n      this.focusChild(this.currentChild - 1);\n    } else {\n      this.focusCurrentChild();\n    }\n  }\n\n  /**\n   * Blurs the menu's current child.\n   */\n  blurCurrentChild() {\n    this.focusState = \"none\";\n\n    if (this.currentChild !== -1) {\n      this.currentMenuItem.blur();\n    }\n  }\n\n  /**\n   * Focus the menu's controller.\n   */\n  focusController() {\n    if (this.dom.controller) {\n      if (this.shouldFocus) {\n        this.dom.controller.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Focus the menu's container.\n   */\n  focusContainer() {\n    if (this.dom.container) {\n      if (this.shouldFocus) {\n        this.dom.container.focus();\n      }\n\n      this.focusState = \"none\";\n    }\n  }\n\n  /**\n   * Close all submenu children.\n   */\n  closeChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.close());\n  }\n\n  /**\n   * Blurs all children and submenu's children.\n   */\n  blurChildren() {\n    this.elements.menuItems.forEach((menuItem) => {\n      menuItem.blur();\n\n      if (menuItem.isSubmenuItem) {\n        menuItem.elements.childMenu.blurChildren();\n      }\n    });\n  }\n}\n\nexport default BaseMenu;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview, TreeviewToggle */\n\nimport BaseMenuItem from \"./_baseMenuItem.js\";\n\n/**\n * A basic navigation link contained inside of a {@link Treeview}.\n *\n * @extends BaseMenuItem\n */\nclass TreeviewItem extends BaseMenuItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}              options                         - The options for generating the menu item.\n   * @param {HTMLElement}         options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}         options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}             [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}             [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initialize the menu item.\n   *\n   * Initialize will call the {@link BaseMenuItem#initialize|BaseMenuItem's initialize method}\n   * as well as set the menu item's `role` to \"none\",\n   * the menu link's `role` to \"treeitem\", and\n   * the menu link's `tabIndex` to -1 in the DOM.\n   */\n  initialize() {\n    super.initialize();\n\n    this.dom.item.setAttribute(\"role\", \"none\");\n    this.dom.link.setAttribute(\"role\", \"treeitem\");\n    this.dom.link.tabIndex = -1;\n  }\n\n  /**\n   * Focuses the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#focus|BaseMenuItem's focus method}\n   * as well as set the menu link's `tabIndex` to 0.\n   */\n  focus() {\n    super.focus();\n\n    this.dom.link.tabIndex = 0;\n  }\n\n  /**\n   * Blurs the menu item's link if the parent menu's\n   * {@link Treeview#shouldFocus|shouldFocus} value is `true`.\n   *\n   * This will call the {@link BaseMenuItem#blur|BaseMenuItem's blur method}\n   * as well as set the menu link's `tabIndex` to -1.\n   */\n  blur() {\n    super.blur();\n\n    this.dom.link.tabIndex = -1;\n  }\n}\n\nexport default TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Treeview */\n\nimport BaseMenuToggle from \"./_baseMenuToggle.js\";\n\n/**\n * A link or button that controls the visibility of a {@link Treeview}.\n *\n * @extends BaseMenuToggle\n */\nclass TreeviewToggle extends BaseMenuToggle {\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}        options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}   options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}   options.parentElement       - The element containing the controlled menu.\n   * @param {Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}       [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default TreeviewToggle;\n","import BaseMenu from \"./_baseMenu.js\";\nimport TreeviewItem from \"./treeviewItem.js\";\nimport TreeviewToggle from \"./treeviewToggle.js\";\nimport { keyPress, preventEvent } from \"./eventHandlers.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See {@link https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html|Navigation Treeview Example Using Computed Properties}\n *\n * @extends BaseMenu\n *\n * @example\n * // Import the class.\n * import { Treeview } from \"accessible-menu\";\n *\n * // Select the desired menu element.\n * const menuElement = document.querySelector(\"nav ul\");\n *\n * // Create the menu.\n * const menu = new Treeview({\n *   menuElement,\n * });\n */\nclass Treeview extends BaseMenu {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @protected\n   *\n   * @type {typeof Treeview}\n   */\n  _MenuType = Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewItem}\n   */\n  _MenuItemType = TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @protected\n   *\n   * @type {typeof TreeviewToggle}\n   */\n  _MenuToggleType = TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                 options                             - The options for generating the menu.\n   * @param {HTMLElement}            options.menuElement                 - The menu element in the DOM.\n   * @param {string}                 [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                 [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                 [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                 [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                 [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}     [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}     [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)} [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)} [options.closeClass = hide]         - The class to apply when a menu is \"closed\".\n   * @param {boolean}                [options.isTopLevel = true]         - A flag to mark the root menu.\n   * @param {(Treeview|null)}        [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                 [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                 [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \"li\",\n    menuLinkSelector = \"a\",\n    submenuItemSelector = \"\",\n    submenuToggleSelector = \"a\",\n    submenuSelector = \"ul\",\n    controllerElement = null,\n    containerElement = null,\n    openClass = \"show\",\n    closeClass = \"hide\",\n    isTopLevel = true,\n    parentMenu = null,\n    hoverType = \"off\",\n    hoverDelay = 250,\n    initialize = true,\n  }) {\n    super({\n      menuElement,\n      menuItemSelector,\n      menuLinkSelector,\n      submenuItemSelector,\n      submenuToggleSelector,\n      submenuSelector,\n      controllerElement,\n      containerElement,\n      openClass,\n      closeClass,\n      isTopLevel,\n      parentMenu,\n      hoverType,\n      hoverDelay,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the menu.\n   *\n   * Initialize will call the {@link BaseMenu#initialize|BaseMenu's initialize method}\n   * as well as set up {@link Treeview#_handleFocus|focus},\n   * {@link Treeview#_handleClick|click},\n   * {@link Treeview#_handleHover|hover},\n   * {@link Treeview#_handleKeydown|keydown}, and\n   * {@link Treeview#_handleKeyup|keyup} events for the menu.\n   *\n   * If the menu is a root menu it's `role` will be set to \"tree\" and the first\n   * menu item's `tabIndex` will be set to 0 in the DOM.\n   *\n   * If the menu is _not_ a root menu it's `role` will be set to \"group\".\n   *\n   * If the BaseMenu's initialize method throws an error,\n   * this will catch it and log it to the console.\n   */\n  initialize() {\n    try {\n      super.initialize();\n\n      if (this.isTopLevel) {\n        this.dom.menu.setAttribute(\"role\", \"tree\");\n        this.elements.menuItems[0].dom.link.tabIndex = 0;\n      } else {\n        this.dom.menu.setAttribute(\"role\", \"group\");\n      }\n\n      this._handleFocus();\n      this._handleClick();\n      this._handleHover();\n      this._handleKeydown();\n      this._handleKeyup();\n    } catch (error) {\n      console.error(error);\n    }\n  }\n\n  /**\n   * Handles keydown events throughout the menu for proper menu use.\n   *\n   * This method exists to assist the {@link Treeview#_handleKeyup|_handleKeyup method}.\n   * - Adds all `keydown` listeners from {@link BaseMenu#_handleKeydown|BaseMenu's _handleKeydown method}\n   * - Adds a `keydown` listener to the menu/all submenus.\n   *   - Blocks propagation on the following keys: \"ArrowUp\", \"ArrowRight\",\n   *     \"ArrowDown\", \"ArrowLeft\", \"Home\", \"End\", \"Space\", \"Enter\", \"Escape\",\n   *     \"*\" (asterisk), and \"A\" through \"Z\".\n   *   - Moves focus out if the \"Tab\" key is pressed.\n   *\n   * @protected\n   */\n  _handleKeydown() {\n    super._handleKeydown();\n\n    this.dom.menu.addEventListener(\"keydown\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n\n      if (key === \"Tab\") {\n        // Hitting Tab:\n        // - Moves focus out of the menu.\n        if (this.elements.rootMenu.focusState !== \"none\") {\n          this.elements.rootMenu.blur();\n        } else {\n          this.elements.rootMenu.focus();\n        }\n      }\n\n      if (this.focusState === \"self\") {\n        const keys = [\n          \"Space\",\n          \"ArrowUp\",\n          \"ArrowDown\",\n          \"ArrowLeft\",\n          \"Asterisk\",\n          \"Home\",\n          \"End\",\n        ];\n        const submenuKeys = [\"Enter\", \"ArrowRight\"];\n        const controllerKeys = [\"Escape\"];\n\n        if (keys.includes(key)) {\n          preventEvent(event);\n        } else if (\n          this.currentMenuItem.isSubmenuItem &&\n          submenuKeys.includes(key)\n        ) {\n          preventEvent(event);\n        } else if (this.elements.controller && controllerKeys.includes(key)) {\n          preventEvent(event);\n        }\n      }\n    });\n  }\n\n  /**\n   * Handles keyup events throughout the menu for proper menu use.\n   *\n   * Adds all `keyup` listeners from {@link BaseMenu#_handleKeyup|BaseMenu's _handleKeyup method}.\n   *\n   * Adds the following keybindings (explanations are taken from the\n   * {@link https://www.w3.org/TR/2019/WD-wai-aria-practices-1.2-20191218/examples/treeview/treeview-2/treeview-2a.html#kbd_label|Navigation Treeview Example Using Computed Properties}):\n   *\n   * | Key | Function |\n   * | --- | --- |\n   * | _Enter_ or _Space_ | Performs the default action (e.g. onclick event) for the focused node. |\n   * | _Down arrow_ | <ul><li>Moves focus to the next node that is focusable without opening or closing a node.</li><li>If focus is on the last node, does nothing.</li></ul> |\n   * | _Up arrow_ | <ul><li>Moves focus to the previous node that is focusable without opening or closing a node.</li><li>If focus is on the first node, does nothing.</li></ul> |\n   * | _Right arrow_ | <ul><li>When focus is on a closed node, opens the node; focus does not move.</li><li>When focus is on a open node, moves focus to the first child node.</li><li>When focus is on an end node, does nothing.</li></ul> |\n   * | _Left arrow_ | <ul><li>When focus is on an open node, closes the node.</li><li>When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.</li><li>When focus is on a root node that is also either an end node or a closed node, does nothing.</li></ul> |\n   * | _Home_ | Moves focus to first node without opening or closing a node. |\n   * | _End_ | Moves focus to the last node that can be focused without expanding any nodes that are closed. |\n   * | _a-z_, _A-Z_ | <ul><li>Focus moves to the next node with a name that starts with the typed character.</li><li>Search wraps to first node if a matching name is not found among the nodes that follow the focused node.</li><li>Search ignores nodes that are descendants of closed nodes.</li></ul> |\n   * | _* (asterisk)_ | <ul><li>Expands all closed sibling nodes that are at the same level as the focused node.</li><li>Focus does not move.</li></ul> |\n   * | _Escape_ | If the root menu is collapsible, collapses the menu and focuses the menu's controlling element. |\n   *\n   * @protected\n   */\n  _handleKeyup() {\n    super._handleKeyup();\n\n    this.dom.menu.addEventListener(\"keyup\", (event) => {\n      this.currentEvent = \"keyboard\";\n\n      const key = keyPress(event);\n      const { altKey, crtlKey, metaKey } = event;\n      const modifier = altKey || crtlKey || metaKey;\n\n      if (key === \"Character\" && !modifier) {\n        // Hitting Character:\n        // - Focus moves to the next node with a name that starts with the typed character.\n        // - Search wraps to first node if a matching name is not found among the nodes that follow the focused node.\n        // - Search ignores nodes that are descendants of closed nodes.\n        preventEvent(event);\n        this.elements.rootMenu.currentEvent = \"character\";\n        this.focusNextNodeWithCharacter(event.key);\n      } else if (this.focusState === \"self\") {\n        if (key === \"Enter\" || key === \"Space\") {\n          // Hitting Space or Enter:\n          // - Performs the default action (e.g. onclick event) for the focused node.\n          // - If focus is on a closed node, opens the node; focus does not move.\n          preventEvent(event);\n\n          if (this.currentMenuItem.isSubmenuItem) {\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.currentMenuItem.elements.toggle.close();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          } else {\n            this.currentMenuItem.dom.link.click();\n          }\n        } else if (key === \"Escape\") {\n          if (\n            this.isTopLevel &&\n            this.elements.controller &&\n            this.elements.controller.isOpen\n          ) {\n            this.elements.controller.close();\n            this.focusController();\n          }\n        } else if (key === \"ArrowDown\") {\n          // Hitting the Down Arrow:\n          // - Moves focus to the next node that is focusable without opening or closing a node.\n          // - If focus is on the last node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.currentMenuItem.elements.childMenu.focusFirstChild();\n          } else if (\n            !this.isTopLevel &&\n            this.currentChild === this.elements.menuItems.length - 1\n          ) {\n            this.focusParentsNextChild();\n          } else {\n            this.focusNextChild();\n          }\n        } else if (key === \"ArrowUp\") {\n          // Hitting the Up Arrow:\n          // - Moves focus to the previous node that is focusable without opening or closing a node.\n          // - If focus is on the first node, does nothing.\n          preventEvent(event);\n\n          const previousMenuItem =\n            this.elements.menuItems[this.currentChild - 1];\n\n          if (\n            previousMenuItem &&\n            previousMenuItem.isSubmenuItem &&\n            previousMenuItem.elements.toggle.isOpen\n          ) {\n            this.blurCurrentChild();\n            this.currentChild = this.currentChild - 1;\n            this.currentMenuItem.elements.childMenu.currentEvent =\n              this.currentEvent;\n            this.focusChildsLastNode();\n          } else if (!this.isTopLevel && this.currentChild === 0) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          } else {\n            this.focusPreviousChild();\n          }\n        } else if (key === \"ArrowRight\") {\n          // Hitting the Right Arrow:\n          // - When focus is on a closed node, opens the node; focus does not move.\n          // - When focus is on a open node, moves focus to the first child node.\n          // - When focus is on an end node, does nothing.\n          if (this.currentMenuItem.isSubmenuItem) {\n            preventEvent(event);\n\n            if (this.currentMenuItem.elements.toggle.isOpen) {\n              this.blurCurrentChild();\n              this.currentMenuItem.elements.childMenu.currentEvent =\n                this.currentEvent;\n              this.currentMenuItem.elements.childMenu.focusFirstChild();\n            } else {\n              this.currentMenuItem.elements.toggle.preview();\n            }\n          }\n        } else if (key === \"ArrowLeft\") {\n          // Hitting the Left Arrow:\n          // - When focus is on an open node, closes the node.\n          // - When focus is on a child node that is also either an end node or a closed node, moves focus to its parent node.\n          // - When focus is on a root node that is also either an end node or a closed node, does nothing.\n          preventEvent(event);\n\n          if (\n            this.currentMenuItem.isSubmenuItem &&\n            this.currentMenuItem.elements.toggle.isOpen\n          ) {\n            this.currentMenuItem.elements.childMenu.blurCurrentChild();\n            this.currentMenuItem.elements.toggle.close();\n          } else if (!this.isTopLevel) {\n            this.blurCurrentChild();\n            this.elements.parentMenu.currentEvent = this.currentEvent;\n            this.elements.parentMenu.focusCurrentChild();\n          }\n        } else if (key === \"Home\") {\n          // Hitting Home:\n          // - Moves focus to first node without opening or closing a node.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusFirstChild();\n        } else if (key === \"End\") {\n          // Hitting End:\n          // - Moves focus to the last node that can be focused without expanding any nodes that are closed.\n          preventEvent(event);\n          this.blurCurrentChild();\n          this.elements.rootMenu.focusLastNode();\n        } else if (key === \"Asterisk\") {\n          // Hitting Asterisk:\n          // - Expands all closed sibling nodes that are at the same level as the focused node.\n          // - Focus does not move.\n          preventEvent(event);\n          this.openChildren();\n        }\n      }\n    });\n  }\n\n  /**\n   * Focus the menu's last node of the entire expanded menu.\n   *\n   * This includes all _open_ child menu items.\n   */\n  focusLastNode() {\n    const numberOfItems = this.elements.menuItems.length - 1;\n    const lastChild = this.elements.menuItems[numberOfItems];\n\n    if (lastChild.isSubmenuItem && lastChild.elements.toggle.isOpen) {\n      this.currentChild = numberOfItems;\n      lastChild.elements.childMenu.currentEvent = this.currentEvent;\n      lastChild.elements.childMenu.focusLastNode();\n    } else {\n      this.focusLastChild();\n    }\n  }\n\n  /**\n   * Open all submenu children.\n   */\n  openChildren() {\n    this.elements.submenuToggles.forEach((toggle) => toggle.preview());\n  }\n\n  /**\n   * Focus the menu's next node starting with a specific letter.\n   *\n   * This includes all _open_ child menu items.\n   *\n   * Wraps to the first node if no match is found after the current node.\n   *\n   * @param {string} char - The character to look for.\n   */\n  focusNextNodeWithCharacter(char) {\n    /**\n     * Gets all the menu's items and submenu's items.\n     *\n     * @param  {Treeview}       menu - The menu.\n     * @return {TreeviewItem[]}      - The menu items.\n     */\n    function getOpenMenuItems(menu) {\n      let menuItems = [];\n\n      menu.elements.menuItems.forEach((menuItem) => {\n        menuItems.push(menuItem);\n\n        if (menuItem.isSubmenuItem && menuItem.elements.toggle.isOpen) {\n          menuItems = [\n            ...menuItems,\n            ...getOpenMenuItems(\n              menuItem.elements.toggle.elements.controlledMenu\n            ),\n          ];\n        }\n      });\n\n      return menuItems;\n    }\n\n    // Ensure the character is lowercase just to be safe.\n    const match = char.toLowerCase();\n    // Sort the menu items so the child _after_ the current child is first to be searched.\n    const menuItems = getOpenMenuItems(this.elements.rootMenu);\n    const currentItem = menuItems.indexOf(this.currentMenuItem) + 1;\n    const sortedMenuItems = [\n      ...menuItems.slice(currentItem),\n      ...menuItems.slice(0, currentItem),\n    ];\n    let ctr = 0;\n    let found = false;\n\n    while (!found && ctr < sortedMenuItems.length) {\n      let text = \"\";\n\n      // Attempt to use the browser to get proper innerText,\n      // otherwise fall back to textContent.\n      if (sortedMenuItems[ctr].dom.item.innerText) {\n        text = sortedMenuItems[ctr].dom.item.innerText;\n      } else {\n        text = sortedMenuItems[ctr].dom.item.textContent;\n      }\n\n      // Remove spaces, make lowercase, and grab the first chracter of the string.\n      text = text.replace(/[\\s]/g, \"\").toLowerCase().charAt(0);\n\n      // Focus the child if the text matches, otherwise move on.\n      if (text === match) {\n        found = true;\n        const menu = sortedMenuItems[ctr].elements.parentMenu;\n        const index = menu.elements.menuItems.indexOf(sortedMenuItems[ctr]);\n        this.elements.rootMenu.blurChildren();\n        menu.focusChild(index);\n      }\n\n      ctr++;\n    }\n  }\n\n  /**\n   * Focus the parent menu's next child.\n   *\n   * This will cascade up through to the root menu.\n   */\n  focusParentsNextChild() {\n    if (!this.elements.parentMenu) return;\n\n    this.elements.parentMenu.currentEvent = this.currentEvent;\n\n    if (\n      this.elements.parentMenu.currentChild ===\n      this.elements.parentMenu.elements.menuItems.length - 1\n    ) {\n      this.elements.parentMenu.blurCurrentChild();\n      this.elements.parentMenu.focusParentsNextChild();\n    } else {\n      this.blurChildren();\n      this.elements.parentMenu.focusNextChild();\n    }\n  }\n\n  /**\n   * Focus the last child of the current child's submenu.\n   *\n   * This will cascade down through to the last open menu.\n   */\n  focusChildsLastNode() {\n    this.currentMenuItem.elements.childMenu.currentEvent = this.currentEvent;\n    this.currentMenuItem.elements.childMenu.focusLastChild();\n\n    if (\n      this.currentMenuItem.elements.childMenu.currentMenuItem.isSubmenuItem &&\n      this.currentMenuItem.elements.childMenu.currentMenuItem.elements.toggle\n        .isOpen\n    ) {\n      this.currentMenuItem.elements.childMenu.blurCurrentChild();\n      this.currentMenuItem.elements.childMenu.focusChildsLastNode();\n    }\n  }\n}\n\nexport default Treeview;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview Bootstrap4TreeviewToggle */\n\nimport TreeviewItem from \"accessible-menu/src/treeviewItem.js\";\n\n/**\n * A basic navigation link contained inside of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewItem extends TreeviewItem {\n  /**\n   * Constructs the menu item.\n   *\n   * @param {object}                        options                         - The options for generating the menu item.\n   * @param {HTMLElement}                   options.menuItemElement         - The menu item in the DOM.\n   * @param {HTMLElement}                   options.menuLinkElement         - The menu item's link in the DOM.\n   * @param {Bootstrap4Treeview}            options.parentMenu              - The parent menu.\n   * @param {boolean}                       [options.isSubmenuItem = false] - A flag to mark if the menu item is controlling a submenu.\n   * @param {Bootstrap4Treeview|null}       [options.childMenu = null]      - The child menu.\n   * @param {Bootstrap4TreeviewToggle|null} [options.toggle = null]         - The controller for the child menu.\n   * @param {boolean}                       [options.initialize = true]     - A flag to initialize the menu item immediately upon creation.\n   */\n  constructor({\n    menuItemElement,\n    menuLinkElement,\n    parentMenu,\n    isSubmenuItem = false,\n    childMenu = null,\n    toggle = null,\n    initialize = true,\n  }) {\n    super({\n      menuItemElement,\n      menuLinkElement,\n      parentMenu,\n      isSubmenuItem,\n      childMenu,\n      toggle,\n      initialize: false,\n    });\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewItem;\n","// eslint-disable-next-line no-unused-vars\n/* global Bootstrap4Treeview */\n\nimport TreeviewToggle from \"accessible-menu/src/treeviewToggle.js\";\n\n/**\n * A link or button that controls the visibility of a Bootstrap4Treeview.\n */\nclass Bootstrap4TreeviewToggle extends TreeviewToggle {\n  /**\n   * The DOM elements within the menu toggle.\n   *\n   * @type {Object<HTMLElement>}\n   *\n   * @property {HTMLElement} toggle    - The menu toggle.\n   * @property {HTMLElement} parent    - The menu containing this toggle.\n   * @property {HTMLElement} container - The element that controlls the visibility of the child menu.\n   * @protected\n   */\n  _dom = {\n    toggle: null,\n    parent: null,\n    container: null,\n  };\n\n  /**\n   * Constructs the menu toggle.\n   *\n   * @param {object}                  options                     - The options for generating the menu toggle.\n   * @param {HTMLElement}             options.menuToggleElement   - The toggle element in the DOM.\n   * @param {HTMLElement}             options.parentElement       - The element containing the controlled menu.\n   * @param {Bootstrap4Treeview}      options.controlledMenu      - The menu controlled by this toggle.\n   * @param {Bootstrap4Treeview|null} [options.parentMenu = null] - The menu containing this toggle.\n   * @param {boolean}                 [options.initialize = true] - A flag to initialize the menu toggle immediately upon creation.\n   */\n  constructor({\n    menuToggleElement,\n    parentElement,\n    controlledMenu,\n    parentMenu = null,\n    initialize = true,\n  }) {\n    super({\n      menuToggleElement,\n      parentElement,\n      controlledMenu,\n      parentMenu,\n      initialize: false,\n    });\n\n    // Set DOM elements.\n    this._dom.toggle = menuToggleElement;\n    this._dom.parent = parentElement;\n    // The container differs based on if the menu is top-level or not.\n    this._dom.container = controlledMenu.isTopLevel\n      ? controlledMenu.dom.container\n      : controlledMenu.dom.menu;\n\n    if (initialize) {\n      this.initialize();\n    }\n  }\n\n  /**\n   * Initializes the toggle by removing the default bootstrap toggle information\n   * and running the parent's initialization.\n   */\n  initialize() {\n    super.initialize();\n\n    if (this.dom.toggle.hasAttribute(\"data-toggle\")) {\n      this.dom.toggle.removeAttribute(\"data-toggle\");\n    }\n\n    if (this.dom.toggle.hasAttribute(\"data-target\")) {\n      this.dom.toggle.removeAttribute(\"data-target\");\n    }\n  }\n\n  /**\n   * Expands the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the expand event once expanded.\n   */\n  _expand(emit = true) {\n    const { openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"true\");\n\n    // Add the open class\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.add(openClass);\n      } else {\n        this.dom.container.classList.add(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._expandEvent);\n    }\n  }\n\n  /**\n   * Collapses the controlled menu.\n   *\n   * Alters ARIA attributes and classes.\n   *\n   * @param {boolean} [emit = true] - A toggle to emit the collapse event once collapsed.\n   */\n  _collapse(emit = true) {\n    const { closeClass, openClass } = this.elements.controlledMenu;\n\n    this.dom.toggle.setAttribute(\"aria-expanded\", \"false\");\n\n    // Add the close class\n    if (closeClass !== \"\") {\n      if (typeof closeClass === \"string\") {\n        this.dom.container.classList.add(closeClass);\n      } else {\n        this.dom.container.classList.add(...closeClass);\n      }\n    }\n\n    // Remove the open class.\n    if (openClass !== \"\") {\n      if (typeof openClass === \"string\") {\n        this.dom.container.classList.remove(openClass);\n      } else {\n        this.dom.container.classList.remove(...openClass);\n      }\n    }\n\n    if (emit) {\n      this.dom.toggle.dispatchEvent(this._collapseEvent);\n    }\n  }\n}\n\nexport default Bootstrap4TreeviewToggle;\n","import Treeview from \"accessible-menu/src/treeview.js\";\nimport Bootstrap4TreeviewItem from \"./bootstrap4TreeviewItem.js\";\nimport Bootstrap4TreeviewToggle from \"./bootstrap4TreeviewToggle.js\";\n\n/**\n * An accessible treeview navigation in the DOM.\n *\n * See https://www.w3.org/TR/wai-aria-practices-1.2/examples/treeview/treeview-2/treeview-2a.html\n */\nclass Bootstrap4Treeview extends Treeview {\n  /**\n   * The class to use when generating submenus.\n   *\n   * @type {typeof Bootstrap4Treeview}\n   *\n   * @public\n   */\n  _MenuType = Bootstrap4Treeview; // eslint-disable-line no-use-before-define\n\n  /**\n   * The class to use when generating menu items.\n   *\n   * @type {typeof Bootstrap4TreeviewItem}\n   *\n   * @public\n   */\n  _MenuItemType = Bootstrap4TreeviewItem;\n\n  /**\n   * The class to use when generating submenu toggles.\n   *\n   * @type {typeof Bootstrap4TreeviewToggle}\n   *\n   * @public\n   */\n  _MenuToggleType = Bootstrap4TreeviewToggle;\n\n  /**\n   * Constructs the menu.\n   *\n   * @param {object}                    options                             - The options for generating the menu.\n   * @param {HTMLElement}               options.menuElement                 - The menu element in the DOM.\n   * @param {string}                    [options.menuItemSelector = li]     - The CSS selector string for menu items.\n   * @param {string}                    [options.menuLinkSelector = a]      - The CSS selector string for menu links.\n   * @param {string}                    [options.submenuItemSelector]       - The CSS selector string for menu items containing submenus.\n   * @param {string}                    [options.submenuToggleSelector = a] - The CSS selector string for submenu toggle buttons/links.\n   * @param {string}                    [options.submenuSelector = ul]      - The CSS selector string for submenus.\n   * @param {(HTMLElement|null)}        [options.controllerElement = null]  - The element controlling the menu in the DOM.\n   * @param {(HTMLElement|null)}        [options.containerElement = null]   - The element containing the menu in the DOM.\n   * @param {(string|string[]|null)}    [options.openClass = show]          - The class to apply when a menu is \"open\".\n   * @param {(string|string[]|null)}    [options.closeClass = collapse]     - The class to apply when a menu is \"closed\".\n   * @param {boolean}                   [options.isTopLevel = false]        - A flag to mark the root menu.\n   * @param {(Bootstrap4Treeview|null)} [options.parentMenu = null]         - The parent menu to this menu.\n   * @param {string}                    [options.hoverType = off]           - The type of hoverability a menu has.\n   * @param {number}                    [options.hoverDelay = 250]          - The delay for closing menus if the menu is hoverable (in miliseconds).\n   * @param {boolean}                   [options.initialize = true]         - A flag to initialize the menu immediately upon creation.\n   */\n  constructor({\n    menuElement,\n    menuItemSelector = \".nav-item\",\n    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\ No newline at end of file
diff --git a/package.json b/package.json
index 0e7a470..32d95dd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "accessible-menu-bootstrap-4",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "description": "A JavaScript library to help you generate WAI-ARIA accessible menus with in the DOM using Bootstrap 4.",
   "main": "index.js",
   "files": [