refactor: to esm

.eslintrc

@@ -0,0 +1,23 @@
+{
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": 2023
+  },
+  "plugins": ["@typescript-eslint"],
+  "rules": {
+    "indent": [2, 2, {"SwitchCase": 1}],
+    "quotes": [2, "single"],
+    "linebreak-style": [2, "unix"],
+    "camelcase": [2, {"properties": "always"}],
+    "brace-style": [2, "1tbs", {"allowSingleLine": true}]
+  },
+  "env": {
+    "es6": true,
+    "node": true,
+    "browser": false
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended"
+  ]
+}

.github/workflows/nodejs.yml

@@ -7,23 +7,22 @@ on:
   push:
     branches: [master]
   pull_request:
-    branches: [master]
 
 jobs:
   build:
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        node-version: [14, 16, 18]
+        node-version: [18, 20]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-      - run: npm install
+      - run: npm ci
       - run: npm test
         env:
           CI: true

lib/index.d.ts

@@ -0,0 +1,29 @@
+export type PluginOptions = {
+  /**
+  The name of the tag for the plugin to use.
+
+  @default 'outlook'
+
+  @example
+  ```js
+  import posthtml from 'posthtml'
+  import posthtmlMso from 'posthtml-mso'
+
+  const html = `
+    <mso only="2013">Show in Outlook 2013</mso>
+    <not-mso>Hide from Outlook</not-mso>
+  `
+
+  posthtml([
+    posthtmlMso({tag: 'mso'})
+  ])
+    .process(html)
+    .then(result => console.log(result.html))
+
+  // Result:
+  // <!--[if mso 15]>Show in Outlook 2013<![endif]-->
+  // <!--[if !mso]><!-->Hide from Outlook<!--<![endif]-->
+  ```
+  */
+  tag?: string;
+};

lib/index.js

@@ -1,6 +1,4 @@
-'use strict'
-
-module.exports = (options = {}) => tree => {
+const plugin = (options = {}) => tree => {
   options.tag = options.tag || 'outlook'
 
   const attributes = ['only', 'not', 'lt', 'lte', 'gt', 'gte']
@@ -24,7 +22,7 @@ module.exports = (options = {}) => tree => {
       return node
     }
 
-    // Uknown tag, skip and return content
+    // Unknown tag, skip and return content
     if (node.tag !== options.tag) {
       return node
     }
@@ -149,3 +147,5 @@ const arraysMatch = (first, second) => {
 
   return true
 }
+
+export default plugin