From 0996f6d2a6efe5a3afff6e82b99bcf897903b640 Mon Sep 17 00:00:00 2001
From: jedrzejchalubek <jedrzej.chalubek@gmail.com>
Date: Tue, 24 Apr 2018 20:37:09 +0200
Subject: [PATCH] Create special function for merging instance options that can
 handle nesteded settings (#205)

---
 dist/glide.esm.js                  | 55 +++++++++++++-----------------
 dist/glide.js                      | 55 +++++++++++++-----------------
 dist/glide.min.js                  |  2 +-
 dist/glide.modular.esm.js          | 55 +++++++++++++-----------------
 src/components/breakpoints.js      |  6 ++--
 src/index.js                       |  3 +-
 src/utils/object.js                | 26 ++++++++++++++
 tests/integration/instance.test.js |  3 +-
 tests/unit/object.test.js          |  4 +--
 9 files changed, 105 insertions(+), 104 deletions(-)

diff --git a/dist/glide.esm.js b/dist/glide.esm.js
index fd9ed1bf..423b3ab7 100644
--- a/dist/glide.esm.js
+++ b/dist/glide.esm.js
@@ -244,20 +244,7 @@ var createClass = function () {
 
 
 
-var defineProperty = function (obj, key, value) {
-  if (key in obj) {
-    Object.defineProperty(obj, key, {
-      value: value,
-      enumerable: true,
-      configurable: true,
-      writable: true
-    });
-  } else {
-    obj[key] = value;
-  }
 
-  return obj;
-};
 
 var _extends = Object.assign || function (target) {
   for (var i = 1; i < arguments.length; i++) {
@@ -463,25 +450,29 @@ function sortKeys(obj) {
 }
 
 /**
- * Deeply merges two objects.
+ * Merges passed settings object with default options.
  *
- * @param  {Object} target
- * @param  {Object} source
+ * @param  {Object} defaults
+ * @param  {Object} settings
  * @return {Object}
  */
-function merge(target, source) {
-  if (isObject(target) && isObject(source)) {
-    Object.keys(source).forEach(function (key) {
-      if (isObject(source[key])) {
-        if (!target[key]) _extends(target, defineProperty({}, key, {}));
-        merge(target[key], source[key]);
-      } else {
-        _extends(target, defineProperty({}, key, source[key]));
-      }
-    });
+function mergeOptions(defaults, settings) {
+  var options = _extends({}, defaults, settings);
+
+  // `Object.assign` do not deeply merge objects, so we
+  // have to do it manually for every nested object
+  // in options. Although it does not look smart,
+  // it's smaller and faster than some fancy
+  // merging deep-merge algorithm script.
+  if (settings.hasOwnProperty('classes')) {
+    options.classes = _extends({}, defaults.classes, settings.classes);
+
+    if (settings.classes.hasOwnProperty('direction')) {
+      options.classes.direction = _extends({}, defaults.classes.direction, settings.classes.direction);
+    }
   }
 
-  return _extends({}, target);
+  return options;
 }
 
 var EventsBus = function () {
@@ -562,7 +553,8 @@ var EventsBus = function () {
 }();
 
 var Glide$2 = function () {
-  /**   * Construct glide.
+  /**
+   * Construct glide.
    *
    * @param  {String} selector
    * @param  {Object} options
@@ -575,9 +567,8 @@ var Glide$2 = function () {
     this._e = new EventsBus();
 
     this.disabled = false;
-
     this.selector = selector;
-    this.settings = merge(defaults, options);
+    this.settings = mergeOptions(defaults, options);
     this.index = this.settings.startAt;
   }
 
@@ -3525,14 +3516,14 @@ var Breakpoints = function (Glide, Components, Events) {
    * Overwrite instance settings with currently matching breakpoint settings.
    * This happens right after component initialization.
    */
-  settings = _extends(settings, Breakpoints.match(points));
+  _extends(settings, Breakpoints.match(points));
 
   /**
    * Update glide with settings of matched brekpoint:
    * - window resize to update slider
    */
   Binder.on('resize', window, throttle(function () {
-    settings = _extends(settings, Breakpoints.match(points));
+    _extends(settings, Breakpoints.match(points));
   }, Glide.settings.throttle));
 
   /**
diff --git a/dist/glide.js b/dist/glide.js
index 88123bd7..207916e0 100644
--- a/dist/glide.js
+++ b/dist/glide.js
@@ -250,20 +250,7 @@ var createClass = function () {
 
 
 
-var defineProperty = function (obj, key, value) {
-  if (key in obj) {
-    Object.defineProperty(obj, key, {
-      value: value,
-      enumerable: true,
-      configurable: true,
-      writable: true
-    });
-  } else {
-    obj[key] = value;
-  }
 
-  return obj;
-};
 
 var _extends = Object.assign || function (target) {
   for (var i = 1; i < arguments.length; i++) {
@@ -469,25 +456,29 @@ function sortKeys(obj) {
 }
 
 /**
- * Deeply merges two objects.
+ * Merges passed settings object with default options.
  *
- * @param  {Object} target
- * @param  {Object} source
+ * @param  {Object} defaults
+ * @param  {Object} settings
  * @return {Object}
  */
-function merge(target, source) {
-  if (isObject(target) && isObject(source)) {
-    Object.keys(source).forEach(function (key) {
-      if (isObject(source[key])) {
-        if (!target[key]) _extends(target, defineProperty({}, key, {}));
-        merge(target[key], source[key]);
-      } else {
-        _extends(target, defineProperty({}, key, source[key]));
-      }
-    });
+function mergeOptions(defaults, settings) {
+  var options = _extends({}, defaults, settings);
+
+  // `Object.assign` do not deeply merge objects, so we
+  // have to do it manually for every nested object
+  // in options. Although it does not look smart,
+  // it's smaller and faster than some fancy
+  // merging deep-merge algorithm script.
+  if (settings.hasOwnProperty('classes')) {
+    options.classes = _extends({}, defaults.classes, settings.classes);
+
+    if (settings.classes.hasOwnProperty('direction')) {
+      options.classes.direction = _extends({}, defaults.classes.direction, settings.classes.direction);
+    }
   }
 
-  return _extends({}, target);
+  return options;
 }
 
 var EventsBus = function () {
@@ -568,7 +559,8 @@ var EventsBus = function () {
 }();
 
 var Glide$2 = function () {
-  /**   * Construct glide.
+  /**
+   * Construct glide.
    *
    * @param  {String} selector
    * @param  {Object} options
@@ -581,9 +573,8 @@ var Glide$2 = function () {
     this._e = new EventsBus();
 
     this.disabled = false;
-
     this.selector = selector;
-    this.settings = merge(defaults, options);
+    this.settings = mergeOptions(defaults, options);
     this.index = this.settings.startAt;
   }
 
@@ -3531,14 +3522,14 @@ var Breakpoints = function (Glide, Components, Events) {
    * Overwrite instance settings with currently matching breakpoint settings.
    * This happens right after component initialization.
    */
-  settings = _extends(settings, Breakpoints.match(points));
+  _extends(settings, Breakpoints.match(points));
 
   /**
    * Update glide with settings of matched brekpoint:
    * - window resize to update slider
    */
   Binder.on('resize', window, throttle(function () {
-    settings = _extends(settings, Breakpoints.match(points));
+    _extends(settings, Breakpoints.match(points));
   }, Glide.settings.throttle));
 
   /**
diff --git a/dist/glide.min.js b/dist/glide.min.js
index 9f572103..757a3d06 100644
--- a/dist/glide.min.js
+++ b/dist/glide.min.js
@@ -3,4 +3,4 @@
  * (c) 2013-2018 Jędrzej Chałubek <jedrzej.chalubek@gmail.com> (http://jedrzejchalubek.com/)
  * Released under the MIT License.
  */
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.Glide=e()}(this,function(){"use strict";var i={type:"slider",startAt:0,perView:1,focusAt:0,gap:10,autoplay:!1,hoverpause:!0,keyboard:!0,swipeThreshold:80,dragThreshold:120,perTouch:!1,touchRatio:.5,touchAngle:45,animationDuration:400,rewindDuration:800,animationTimingFunc:"cubic-bezier(0.165, 0.840, 0.440, 1.000)",throttle:10,direction:"ltr",peek:0,breakpoints:{},classes:{direction:{ltr:"glide--ltr",rtl:"glide--rtl"},slider:"glide--slider",carousel:"glide--carousel",swipeable:"glide--swipeable",dragging:"glide--dragging",cloneSlide:"glide__slide--clone",activeNav:"glide__bullet--active",activeSlide:"glide__slide--active",disabledArrow:"glide__arrow--disabled"}};var n="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof 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n.on(["destroy","update"],function(){i.removeClass()}),n.on("update",function(){i.mount()}),n.on(["build.before","update"],function(){i.addClass()}),i},Peek:function(t,e,n){var i={mount:function(){this.value=t.settings.peek}};return n.on(["resize","update"],function(){i.mount()}),i},Sizes:function(t,n,e){var i={setupSlides:function(){for(var t=n.Html.slides,e=0;e<t.length;e++)t[e].style.width=this.slideWidth+"px"},setupWrapper:function(t){n.Html.wrapper.style.width=this.wrapperSize+"px"},remove:function(){for(var t=n.Html.slides,e=0;e<t.length;e++)t[e].style.width="";n.Html.wrapper.style.width=""}};return e.on(["build.before","resize","update"],function(){i.setupSlides(),i.setupWrapper()}),e.on("destroy",function(){i.remove()}),i},Gaps:function(t,r,e){var n={mount:function(){this.value=t.settings.gap},apply:function(t){for(var e=0,n=t.length;e<n;e++){var i=t[e].style,o=r.Direction.value;i[y[o][0]]=0!==e?this.value/2+"px":"",e!==t.length-1?i[y[o][1]]=this.value/2+"px":i[y[o][1]]=""}},remove:function(t){for(var e=0,n=t.length;e<n;e++){var i=t[e].style;i.marginLeft="",i.marginRight=""}}};return e.on("update",function(){n.mount()}),e.on(["build.after","update"],g(function(){n.apply(r.Html.wrapper.children)},30)),e.on("destroy",function(){n.remove(r.Html.wrapper.children)}),n},Move:function(t,n,i){var e={mount:function(){this._o=0},make:function(){var t=this,e=0<arguments.length&&void 0!==arguments[0]?arguments[0]:0;this.offset=e,i.emit("move",{movement:this.value}),n.Transition.after(function(){i.emit("move.after",{movement:t.value})})}};return i.on(["build.before","run"],function(){e.make()}),e},Clones:function(s,u,t){var e={mount:function(){this.items=[],s.isType("carousel")&&(this.pattern=this.map(),this.items=this.collect())},map:function(){for(var t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:[],e=s.settings.perView,n=u.Html.slides.length,i=0;i<Math.max(1,Math.floor(e/n));i++){for(var o=0;o<=n-1;o++)t.push(""+o);for(var r=n-1;0<=r;r--)t.unshift("-"+r)}return t},collect:function(){for(var t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:[],e=this.pattern,n=0;n<e.length;n++){var i=u.Html.slides[Math.abs(e[n])].cloneNode(!0);i.classList.add(s.settings.classes.cloneSlide),t.push(i)}return t},append:function(){for(var t=this.items,e=this.pattern,n=0;n<t.length;n++){var i=t[n];i.style.width=u.Sizes.slideWidth+"px","-"===e[n][0]?u.Html.wrapper.insertBefore(i,u.Html.slides[0]):u.Html.wrapper.appendChild(i)}},remove:function(){for(var t=this.items,e=0;e<t.length;e++)t[e].remove()}};return t.on("update",function(){e.remove(),e.mount(),e.append()}),t.on("build.before",function(){s.isType("carousel")&&e.append()}),t.on("destroy",function(){e.remove()}),e},Resize:function(t,e,n){var i=new k,o={mount:function(){this.bind()},bind:function(){i.on("resize",window,g(function(){n.emit("resize")},t.settings.throttle))},unbind:function(){i.off("resize",window)}};return n.on("destroy",function(){o.unbind(),i.destroy()}),o},Build:function(n,i,t){var e={mount:function(){t.emit("build.before"),this.typeClass(),this.activeClass(),t.emit("build.after")},typeClass:function(){i.Html.root.classList.add(n.settings.classes[n.settings.type])},activeClass:function(){var e=n.settings.classes,t=i.Html.slides[n.index];t.classList.add(e.activeSlide),b(t).forEach(function(t){t.classList.remove(e.activeSlide)})},removeClasses:function(){var e=n.settings.classes;i.Html.root.classList.remove(e[n.settings.type]),i.Html.slides.forEach(function(t){t.classList.remove(e.activeSlide)})}};return t.on(["destroy","update"],function(){e.removeClasses()}),t.on(["resize","update"],function(){e.mount()}),t.on("move.after",function(){e.activeClass()}),e},Run:function(r,n,s){var t={mount:function(){this._o=!1},make:function(t){var e=this;r.disabled||(r.disable(),this.move=t,s.emit("run.before",this.move),this.calculate(),s.emit("run",this.move),n.Transition.after(function(){(e.isOffset("<")||e.isOffset(">"))&&(e._o=!1,s.emit("run.offset",e.move)),s.emit("run.after",e.move),r.enable()}))},calculate:function(){var t=this.move,e=this.length,n=t.steps,i=t.direction,o="number"==typeof v(n)&&0!==v(n);switch(i){case">":">"===n?r.index=e:this.isEnd()?(this._o=!0,r.index=0,s.emit("run.end",t)):o?r.index+=Math.min(e-r.index,-v(n)):r.index++;break;case"<":"<"===n?r.index=0:this.isStart()?(this._o=!0,r.index=e,s.emit("run.start",t)):o?r.index-=Math.min(r.index,v(n)):r.index--;break;case"=":r.index=n}},isStart:function(){return 0===r.index},isEnd:function(){return r.index===this.length},isOffset:function(t){return this._o&&this.move.direction===t}};return t},Swipe:function(c,l,f){var e=new k,d=0,h=0,p=0,n=!1,t={mount:function(){this.bindSwipeStart()},start:function(t){if(!n&&!c.disabled){this.disable();var e=this.touches(t);d=null,h=v(e.pageX),p=v(e.pageY),this.bindSwipeMove(),this.bindSwipeEnd(),f.emit("swipe.start")}},move:function(t){if(!c.disabled){var e=c.settings,n=this.touches(t),i=v(n.pageX)-h,o=v(n.pageY)-p,r=Math.abs(i<<2),s=Math.abs(o<<2),u=Math.sqrt(r+s),a=Math.sqrt(s);if(180*(d=Math.asin(a/u))/Math.PI<e.touchAngle&&l.Move.make(i*parseFloat(e.touchRatio)),!(180*d/Math.PI<e.touchAngle))return!1;t.stopPropagation(),t.preventDefault(),l.Html.root.classList.add(e.classes.dragging),f.emit("swipe.move")}},end:function(t){if(!c.disabled){var e=c.settings,n=this.touches(t),i=this.threshold(t),o=n.pageX-h,r=180*d/Math.PI,s=Math.round(o/l.Sizes.slideWidth);this.enable(),i<o&&r<e.touchAngle?(e.perTouch&&(s=Math.min(s,v(e.perTouch))),l.Direction.is("rtl")&&(s=-s),l.Run.make(l.Direction.resolve("<"+s))):o<-i&&r<e.touchAngle?(e.perTouch&&(s=Math.max(s,-v(e.perTouch))),l.Direction.is("rtl")&&(s=-s),l.Run.make(l.Direction.resolve(">"+s))):l.Move.make(),l.Html.root.classList.remove(e.classes.dragging),this.unbindSwipeMove(),this.unbindSwipeEnd(),f.emit("swipe.end")}},bindSwipeStart:function(){var t=c.settings;t.swipeThreshold&&e.on(H[0],l.Html.wrapper,this.start.bind(this)),t.dragThreshold&&e.on(H[1],l.Html.wrapper,this.start.bind(this))},unbindSwipeStart:function(){e.off(H[0],l.Html.wrapper),e.off(H[1],l.Html.wrapper)},bindSwipeMove:function(){e.on(T,l.Html.wrapper,g(this.move.bind(this),c.settings.throttle))},unbindSwipeMove:function(){e.off(T,l.Html.wrapper)},bindSwipeEnd:function(){e.on(x,l.Html.wrapper,this.end.bind(this))},unbindSwipeEnd:function(){e.off(x,l.Html.wrapper)},touches:function(t){return O.includes(t.type)?t:t.touches[0]||t.changedTouches[0]},threshold:function(t){var e=c.settings;return O.includes(t.type)?e.dragThreshold:e.swipeThreshold},enable:function(){return n=!1,l.Transition.enable(),this},disable:function(){return n=!0,l.Transition.disable(),this}};return f.on("build.after",function(){l.Html.root.classList.add(c.settings.classes.swipeable)}),f.on("destroy",function(){t.unbindSwipeStart(),t.unbindSwipeMove(),t.unbindSwipeEnd(),e.destroy()}),t},Images:function(t,e,n){var i=new k,o={mount:function(){this.bind()},bind:function(){i.on("dragstart",e.Html.wrapper,this.dragstart)},unbind:function(){i.off("dragstart",e.Html.wrapper)},dragstart:function(t){t.preventDefault()}};return n.on("destroy",function(){o.unbind(),i.destroy()}),o},Anchors:function(t,e,n){var i=new k,o=!1,r=!1,s={mount:function(){this._a=e.Html.wrapper.querySelectorAll("a"),this.bind()},bind:function(){i.on("click",e.Html.wrapper,this.click)},unbind:function(){i.off("click",e.Html.wrapper)},click:function(t){t.stopPropagation(),r&&t.preventDefault()},detach:function(){if(r=!0,!o){for(var t=0;t<this.items.length;t++)this.items[t].draggable=!1,this.items[t].dataset.href=this.items[t].getAttribute("href"),this.items[t].removeAttribute("href");o=!0}return this},attach:function(){if(r=!1,o){for(var t=0;t<this.items.length;t++)this.items[t].draggable=!0,this.items[t].setAttribute("href",this.items[t].dataset.href),delete this.items[t].dataset.href;o=!1}return this}};return n.on("swipe.move",function(){s.detach()}),n.on("swipe.end",function(){e.Transition.after(function(){s.attach()})}),n.on("destroy",function(){s.attach(),s.unbind(),i.destroy()}),s},Controls:function(i,e,t){var n=new k,o={mount:function(){this._n=e.Html.root.querySelectorAll('[data-glide-el="controls[nav]"]'),this._i=e.Html.root.querySelectorAll('[data-glide-el^="controls"]'),this.addBindings()},setActive:function(){for(var t=0;t<this._n.length;t++)this.addClass(this._n[t].children)},removeActive:function(){for(var t=0;t<this._n.length;t++)this.removeClass(this._n[t].children)},addClass:function(t){var e=i.settings,n=t[i.index];n.classList.add(e.classes.activeNav),b(n).forEach(function(t){t.classList.remove(e.classes.activeNav)})},removeClass:function(t){t[i.index].classList.remove(i.settings.classes.activeNav)},addBindings:function(){for(var t=0;t<this._i.length;t++)this.bind(this._i[t].children)},removeBindings:function(){for(var t=0;t<this._i.length;t++)this.unbind(this._i[t].children)},bind:function(t){for(var e=0;e<t.length;e++)n.on(["click","touchstart"],t[e],this.click)},unbind:function(t){for(var e=0;e<t.length;e++)n.off(["click","touchstart"],t[e])},click:function(t){t.preventDefault(),e.Run.make(e.Direction.resolve(t.currentTarget.dataset.glideDir))}};return t.on(["mount.after","move.after"],function(){o.setActive()}),t.on("destroy",function(){o.removeBindings(),o.removeActive(),n.destroy()}),o},Keyboard:function(t,e,n){var i=new k,o={mount:function(){t.settings.keyboard&&this.bind()},bind:function(){i.on("keyup",document,this.press)},unbind:function(){i.off("keyup",document)},press:function(t){39===t.keyCode&&e.Run.make(e.Direction.resolve(">")),37===t.keyCode&&e.Run.make(e.Direction.resolve("<"))}};return n.on(["destroy","update"],function(){o.unbind()}),n.on("update",function(){o.mount()}),n.on("destroy",function(){i.destroy()}),o},Autoplay:function(e,n,t){var i=new k,o={mount:function(){this.start(),e.settings.hoverpause&&this.bind()},start:function(){var t=this;e.settings.autoplay&&f(this._i)&&(this._i=setInterval(function(){t.stop(),n.Run.make(">"),t.start()},this.time))},stop:function(){this._i=clearInterval(this._i)},bind:function(){var t=this;i.on("mouseover",n.Html.root,function(){t.stop()}),i.on("mouseout",n.Html.root,function(){t.start()})},unbind:function(){i.off(["mouseover","mouseout"],n.Html.root)}};return t.on(["destroy","update"],function(){o.unbind()}),t.on(["run.before","pause","destroy","swipe.start","update"],function(){o.stop()}),t.on(["run.after","play","swipe.end"],function(){o.start()}),t.on("update",function(){o.mount()}),t.on("destroy",function(){i.destroy()}),o},Breakpoints:function(t,e,n){var i=new k,o=t.settings,r=o.breakpoints;r=A(r);var s=a({},o),u={match:function(t){if(void 0!==window.matchMedia)for(var e in t)if(t.hasOwnProperty(e)&&window.matchMedia("(max-width: "+e+"px)").matches)return t[e];return s}};return a(o,u.match(r)),i.on("resize",window,g(function(){a(o,u.match(r))},t.settings.throttle)),n.on("update",function(){r=A(r),s=a({},o)}),n.on("destroy",function(){i.off("resize",window)}),u}};return function(t){function e(){return u(this,e),o(this,(e.__proto__||Object.getPrototypeOf(e)).apply(this,arguments))}return function(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function, not "+typeof e);t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,enumerable:!1,writable:!0,configurable:!0}}),e&&(Object.setPrototypeOf?Object.setPrototypeOf(t,e):t.__proto__=e)}(e,p),i(e,[{key:"mount",value:function(){var t=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{};return function t(e,n,i){null===e&&(e=Function.prototype);var o=Object.getOwnPropertyDescriptor(e,n);if(void 0===o){var r=Object.getPrototypeOf(e);return null===r?void 0:t(r,n,i)}if("value"in o)return o.value;var s=o.get;return void 0!==s?s.call(i):void 0}(e.prototype.__proto__||Object.getPrototypeOf(e.prototype),"mount",this).call(this,a({},M,t))}}]),e}()});
diff --git a/dist/glide.modular.esm.js b/dist/glide.modular.esm.js
index 2f412885..fff037a4 100644
--- a/dist/glide.modular.esm.js
+++ b/dist/glide.modular.esm.js
@@ -244,20 +244,7 @@ var createClass = function () {
 
 
 
-var defineProperty = function (obj, key, value) {
-  if (key in obj) {
-    Object.defineProperty(obj, key, {
-      value: value,
-      enumerable: true,
-      configurable: true,
-      writable: true
-    });
-  } else {
-    obj[key] = value;
-  }
 
-  return obj;
-};
 
 var _extends = Object.assign || function (target) {
   for (var i = 1; i < arguments.length; i++) {
@@ -463,25 +450,29 @@ function sortKeys(obj) {
 }
 
 /**
- * Deeply merges two objects.
+ * Merges passed settings object with default options.
  *
- * @param  {Object} target
- * @param  {Object} source
+ * @param  {Object} defaults
+ * @param  {Object} settings
  * @return {Object}
  */
-function merge(target, source) {
-  if (isObject(target) && isObject(source)) {
-    Object.keys(source).forEach(function (key) {
-      if (isObject(source[key])) {
-        if (!target[key]) _extends(target, defineProperty({}, key, {}));
-        merge(target[key], source[key]);
-      } else {
-        _extends(target, defineProperty({}, key, source[key]));
-      }
-    });
+function mergeOptions(defaults, settings) {
+  var options = _extends({}, defaults, settings);
+
+  // `Object.assign` do not deeply merge objects, so we
+  // have to do it manually for every nested object
+  // in options. Although it does not look smart,
+  // it's smaller and faster than some fancy
+  // merging deep-merge algorithm script.
+  if (settings.hasOwnProperty('classes')) {
+    options.classes = _extends({}, defaults.classes, settings.classes);
+
+    if (settings.classes.hasOwnProperty('direction')) {
+      options.classes.direction = _extends({}, defaults.classes.direction, settings.classes.direction);
+    }
   }
 
-  return _extends({}, target);
+  return options;
 }
 
 var EventsBus = function () {
@@ -562,7 +553,8 @@ var EventsBus = function () {
 }();
 
 var Glide$2 = function () {
-  /**   * Construct glide.
+  /**
+   * Construct glide.
    *
    * @param  {String} selector
    * @param  {Object} options
@@ -575,9 +567,8 @@ var Glide$2 = function () {
     this._e = new EventsBus();
 
     this.disabled = false;
-
     this.selector = selector;
-    this.settings = merge(defaults, options);
+    this.settings = mergeOptions(defaults, options);
     this.index = this.settings.startAt;
   }
 
@@ -3525,14 +3516,14 @@ var breakpoints = function (Glide, Components, Events) {
    * Overwrite instance settings with currently matching breakpoint settings.
    * This happens right after component initialization.
    */
-  settings = _extends(settings, Breakpoints.match(points));
+  _extends(settings, Breakpoints.match(points));
 
   /**
    * Update glide with settings of matched brekpoint:
    * - window resize to update slider
    */
   Binder.on('resize', window, throttle(function () {
-    settings = _extends(settings, Breakpoints.match(points));
+    _extends(settings, Breakpoints.match(points));
   }, Glide.settings.throttle));
 
   /**
diff --git a/src/components/breakpoints.js b/src/components/breakpoints.js
index e8487786..f3664952 100644
--- a/src/components/breakpoints.js
+++ b/src/components/breakpoints.js
@@ -1,7 +1,7 @@
 import { warn } from '../utils/log'
 import { throttle } from '../utils/wait'
 import { isObject } from '../utils/unit'
-import { sortKeys } from '../utils/object'
+import { sortKeys, mergeOptions } from '../utils/object'
 
 import EventsBinder from '../core/event/events-binder'
 
@@ -82,14 +82,14 @@ export default function (Glide, Components, Events) {
    * Overwrite instance settings with currently matching breakpoint settings.
    * This happens right after component initialization.
    */
-  settings = Object.assign(settings, Breakpoints.match(points))
+  Object.assign(settings, Breakpoints.match(points))
 
   /**
    * Update glide with settings of matched brekpoint:
    * - window resize to update slider
    */
   Binder.on('resize', window, throttle(() => {
-    settings = Object.assign(settings, Breakpoints.match(points))
+    Object.assign(settings, Breakpoints.match(points))
   }, Glide.settings.throttle))
 
   /**
diff --git a/src/index.js b/src/index.js
index bbd0d092..975e8a9a 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,6 +1,7 @@
 import defaults from './defaults'
 import { warn } from './utils/log'
 import { mount } from './core/index'
+import { mergeOptions } from './utils/object'
 import { toInt, isObject } from './utils/unit'
 
 import EventsBus from './core/event/events-bus'
@@ -18,7 +19,7 @@ export default class Glide {
 
     this.disabled = false
     this.selector = selector
-    this.settings = Object.assign({}, defaults, options)
+    this.settings = mergeOptions(defaults, options)
     this.index = this.settings.startAt
   }
 
diff --git a/src/utils/object.js b/src/utils/object.js
index 7550c1dc..dce08918 100644
--- a/src/utils/object.js
+++ b/src/utils/object.js
@@ -23,3 +23,29 @@ export function sortKeys (obj) {
     return (r[k], r)
   }, {})
 }
+
+/**
+ * Merges passed settings object with default options.
+ *
+ * @param  {Object} defaults
+ * @param  {Object} settings
+ * @return {Object}
+ */
+export function mergeOptions (defaults, settings) {
+  let options = Object.assign({}, defaults, settings)
+
+  // `Object.assign` do not deeply merge objects, so we
+  // have to do it manually for every nested object
+  // in options. Although it does not look smart,
+  // it's smaller and faster than some fancy
+  // merging deep-merge algorithm script.
+  if (settings.hasOwnProperty('classes')) {
+    options.classes = Object.assign({}, defaults.classes, settings.classes)
+
+    if (settings.classes.hasOwnProperty('direction')) {
+      options.classes.direction = Object.assign({}, defaults.classes.direction, settings.classes.direction)
+    }
+  }
+
+  return options
+}
diff --git a/tests/integration/instance.test.js b/tests/integration/instance.test.js
index 297d42b3..ebfee3b3 100644
--- a/tests/integration/instance.test.js
+++ b/tests/integration/instance.test.js
@@ -1,5 +1,6 @@
 import html from '../fixtures/html'
 import defaults from '../../src/defaults'
+import { mergeOptions } from '../../src/utils/object'
 
 import Glide from '../../entry/entry-complete'
 
@@ -37,7 +38,7 @@ describe('Glide', () => {
       }
     }).mount()
 
-    expect(glide.settings).toEqual(Object.assign(defaults, {
+    expect(glide.settings).toEqual(mergeOptions(defaults, {
       startAt: 2,
       classes: {
         direction: {
diff --git a/tests/unit/object.test.js b/tests/unit/object.test.js
index 53e4685a..1822c22e 100644
--- a/tests/unit/object.test.js
+++ b/tests/unit/object.test.js
@@ -1,4 +1,4 @@
-import { define, options } from '../../src/utils/object'
+import { define, mergeOptions } from '../../src/utils/object'
 
 describe('Function', () => {
   test('`define` should create object getters and setters', () => {
@@ -22,7 +22,7 @@ describe('Function', () => {
   })
 
   test('`merge` should deep merge defaults and options object', () => {
-    let obj = options(
+    let obj = mergeOptions(
       {
         a: 1,
         b: 2,