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+[![npm][npm]][npm-url]
+[![node][node]][node-url]
+[![deps][deps]][deps-url]
+[![test][test]][test-url]
+[![coverage][cover]][cover-url]
+[![chat][chat]][chat-url]
+
+
+<div align="center">
+  <a href="https://github.com/webpack/webpack">
+    <img width="200" height="200"
+      src="https://cdn.rawgit.com/webpack/media/e7485eb2/logo/icon.svg">
+  </a>
+  <h1>UglifyJS Webpack Plugin</h1>
+	<p>This plugin uses <a href="https://github.com/mishoo/UglifyJS2/tree/harmony">UglifyJS v3 </a><a href="https://npmjs.com/package/uglify-es">(`uglify-es`)</a> to minify your JavaScript</p>
+</div>
+
+> ℹ️  `webpack < v4.0.0` currently contains [`v0.4.6`](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/tree/version-0.4) of this plugin under `webpack.optimize.UglifyJsPlugin` as an alias. For usage of the latest version (`v1.0.0`), please follow the instructions below. Aliasing `v1.0.0` as `webpack.optimize.UglifyJsPlugin` is scheduled for `webpack v4.0.0`
+
+<h2 align="center">Install</h2>
+
+```bash
+npm i -D uglifyjs-webpack-plugin
+```
+
+<h2 align="center">Usage</h2>
+
+**webpack.config.js**
+```js
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
+
+module.exports = {
+  //...
+  optimization: {
+    minimizer: [
+      new UglifyJsPlugin()
+    ]
+  }
+}
+```
+
+<h2 align="center">Options</h2>
+
+|Name|Type|Default|Description|
+|:--:|:--:|:-----:|:----------|
+|**`test`**|`{RegExp\|Array<RegExp>}`| <code>/\\.js$/i</code>|Test to match files against|
+|**`include`**|`{RegExp\|Array<RegExp>}`|`undefined`|Files to `include`|
+|**`exclude`**|`{RegExp\|Array<RegExp>}`|`undefined`|Files to `exclude`|
+|**`cache`**|`{Boolean\|String}`|`false`|Enable file caching|
+|**`cacheKeys`**|`{Function(defaultCacheKeys, file) -> {Object}}`|`defaultCacheKeys => defaultCacheKeys`|Allows you to override default cache keys|
+|**`parallel`**|`{Boolean\|Number}`|`false`|Use multi-process parallel running to improve the build speed|
+|**`sourceMap`**|`{Boolean}`|`false`|Use source maps to map error message locations to modules (This slows down the compilation) ⚠️ **`cheap-source-map` options don't work with this plugin**|
+|**`minify`**|`{Function}`|`undefined`|Allows you to override default minify function|
+|**`uglifyOptions`**|`{Object}`|[`{...defaults}`](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/tree/master#uglifyoptions)|`uglify` [Options](https://github.com/mishoo/UglifyJS2/tree/harmony#minify-options)|
+|**`extractComments`**|`{Boolean\|RegExp\|Function<(node, comment) -> {Boolean\|Object}>}`|`false`|Whether comments shall be extracted to a separate file, (see [details](https://github.com/webpack/webpack/commit/71933e979e51c533b432658d5e37917f9e71595a) (`webpack >= 2.3.0`)|
+|**`warningsFilter`**|`{Function(source) -> {Boolean}}`|`() => true`|Allow to filter uglify warnings|
+
+### `test`
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    test: /\.js($|\?)/i
+  })
+]
+```
+
+### `include`
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    include: /\/includes/
+  })
+]
+```
+
+### `exclude`
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    exclude: /\/excludes/
+  })
+]
+```
+
+### `cache`
+
+If you use your own `minify` function please read the `minify` section for cache invalidation correctly.
+
+#### `{Boolean}`
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    cache: true
+  })
+]
+```
+
+Enable file caching.
+Default path to cache directory: `node_modules/.cache/uglifyjs-webpack-plugin`.
+
+#### `{String}`
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    cache: 'path/to/cache'
+  })
+]
+```
+
+Path to cache directory.
+
+### `cacheKeys`
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    cache: true,
+    cacheKeys: (defaultCacheKeys, file) => {
+      defaultCacheKeys.myCacheKey = 'myCacheKeyValue';
+      
+      return defaultCacheKeys;
+    },
+  })
+]
+```
+
+Allows you to override default cache keys.
+
+Default keys:
+```js
+{
+  'uglify-es': versions.uglify, // uglify version
+  'uglifyjs-webpack-plugin': versions.plugin, // plugin version
+  'uglifyjs-webpack-plugin-options': this.options, // plugin options
+  path: compiler.outputPath ? `${compiler.outputPath}/${file}` : file, // asset path
+  hash: crypto.createHash('md4').update(input).digest('hex'), // source file hash
+}
+```
+
+### `parallel`
+
+#### `{Boolean}`
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    parallel: true
+  })
+]
+```
+
+Enable parallelization.
+Default number of concurrent runs: `os.cpus().length - 1`.
+
+#### `{Number}`
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    parallel: 4
+  })
+]
+```
+
+Number of concurrent runs.
+
+> ℹ️  Parallelization can speedup your build significantly and is therefore **highly recommended**
+
+### `sourceMap`
+
+If you use your own `minify` function please read the `minify` section for handling source maps correctly.
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    sourceMap: true
+  })
+]
+```
+
+> ⚠️ **`cheap-source-map` options don't work with this plugin**
+
+### `minify`
+
+> ⚠️ **Always use `require` inside `minify` function when `parallel` option enabled**
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+     minify(file, sourceMap) {
+       const extractedComments = [];
+
+       // Custom logic for extract comments
+      
+       const { error, map, code, warnings } = require('uglify-module') // Or require('./path/to/uglify-module')
+         .minify(
+           file,
+           { /* Your options for minification */ },
+         );
+
+       return { error, map, code, warnings, extractedComments };
+      }
+  })
+]
+```
+
+By default plugin uses `uglify-es` package.
+
+Examples:
+
+#### `uglify-js`
+
+```bash
+npm i -D uglify-js
+```
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    // Uncomment lines below for cache invalidation correctly
+    // cache: true,
+    // cacheKeys(defaultCacheKeys) {
+    //   return Object.assign(
+    //     {},
+    //     defaultCacheKeys,
+    //     { 'uglify-js': require('uglify-js/package.json').version },
+    //   );
+    // },
+    minify(file, sourceMap) {
+      // https://github.com/mishoo/UglifyJS2#minify-options
+      const uglifyJsOptions = { /* your `uglify-js` package options */ };
+
+      if (sourceMap) {
+        uglifyJsOptions.sourceMap = {
+          content: sourceMap,
+        };
+      }
+
+      return require('uglify-js').minify(file, uglifyJsOptions);
+    }
+  })
+]
+```
+
+#### `terser`
+
+```bash
+npm i -D terser
+```
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    // Uncomment lines below for cache invalidation correctly
+    // cache: true,
+    // cacheKeys(defaultCacheKeys) {
+    //   return Object.assign(
+    //     {},
+    //     defaultCacheKeys,
+    //     { terser: require('terser/package.json').version },
+    //   );
+    // },
+    minify(file, sourceMap) {
+      // https://github.com/fabiosantoscode/terser#minify-options
+      const terserOptions = { /* your `terser` package options */ };
+
+      if (sourceMap) {
+        terserOption.sourceMap = {
+          content: sourceMap,
+        };
+      }
+
+      return require('terser').minify(file, terserOptions);
+    }
+  })
+]
+```
+
+### [`uglifyOptions`](https://github.com/mishoo/UglifyJS2/tree/harmony#minify-options)
+
+|Name|Type|Default|Description|
+|:--:|:--:|:-----:|:----------|
+|**`ecma`**|`{Number}`|`undefined`|Supported ECMAScript Version (`5`, `6`, `7` or `8`). Affects `parse`, `compress` && `output` options|
+|**`warnings`**|`{Boolean}`|`false`|Display Warnings|
+|**[`parse`](https://github.com/mishoo/UglifyJS2/tree/harmony#parse-options)**|`{Object}`|`{}`|Additional Parse Options|
+|**[`compress`](https://github.com/mishoo/UglifyJS2/tree/harmony#compress-options)**|`{Boolean\|Object}`|`true`|Additional Compress Options|
+|**[`mangle`](https://github.com/mishoo/UglifyJS2/tree/harmony#mangle-options)**|`{Boolean\|Object}`|`{inline: false}`|Enable Name Mangling (See [Mangle Properties](https://github.com/mishoo/UglifyJS2/tree/harmony#mangle-properties-options) for advanced setups, use with ⚠️)|
+|**[`output`](https://github.com/mishoo/UglifyJS2/tree/harmony#output-options)**|`{Object}`|`{comments: extractComments ? false : /^\**!\|@preserve\|@license\|@cc_on/,}`|Additional Output Options (The defaults are optimized for best compression)|
+|**`toplevel`**|`{Boolean}`|`false`|Enable top level variable and function name mangling and to drop unused variables and functions|
+|**`nameCache`**|`{Object}`|`null`|Enable cache of mangled variable and property names across multiple invocations|
+|**`ie8`**|`{Boolean}`|`false`|Enable IE8 Support|
+|**`keep_classnames`**|`{Boolean}`|`undefined`|Enable prevent discarding or mangling of class names|
+|**`keep_fnames`**|`{Boolean}`|`false`| Enable prevent discarding or mangling of function names. Useful for code relying on `Function.prototype.name`. If the top level minify option `keep_classnames` is `undefined` it will be overriden with the value of the top level minify option `keep_fnames`|
+|**`safari10`**|`{Boolean}`|`false`|Enable work around Safari 10/11 bugs in loop scoping and `await`|
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    uglifyOptions: {
+      ecma: 8,
+      warnings: false,
+      parse: {...options},
+      compress: {...options},
+      mangle: {
+        ...options,
+        properties: {
+          // mangle property options
+        }
+      },
+      output: {
+        comments: false,
+        beautify: false,
+        ...options
+      },
+      toplevel: false,
+      nameCache: null,
+      ie8: false,
+      keep_classnames: undefined,
+      keep_fnames: false,
+      safari10: false,
+    }
+  })
+]
+```
+
+### `extractComments`
+
+#### `{Boolean}`
+
+All comments that normally would be preserved by the `comments` option will be moved to a separate file. If the original file is named `foo.js`, then the comments will be stored to `foo.js.LICENSE`.
+
+#### `{RegExp|String}` or  `{Function<(node, comment) -> {Boolean}>}`
+
+All comments that match the given expression (resp. are evaluated to `true` by the function) will be extracted to the separate file. The `comments` option specifies whether the comment will be preserved, i.e. it is possible to preserve some comments (e.g. annotations) while extracting others or even preserving comments that have been extracted.
+
+#### `{Object}`
+
+|Name|Type|Default|Description|
+|:--:|:--:|:-----:|:----------|
+|**`condition`**|`{Regex\|Function}`|``|Regular Expression or function (see previous point)|
+|**`filename`**|`{String\|Function}`|`${file}.LICENSE`|The file where the extracted comments will be stored. Can be either a `{String}` or a `{Function<(string) -> {String}>}`, which will be given the original filename. Default is to append the suffix `.LICENSE` to the original filename|
+|**`banner`**|`{Boolean\|String\|Function}`|`/*! For license information please see ${filename}.js.LICENSE */`|The banner text that points to the extracted file and will be added on top of the original file. Can be `false` (no banner), a `{String}`, or a `{Function<(string) -> {String}` that will be called with the filename where extracted comments have been stored. Will be wrapped into comment|
+
+### `warningsFilter`
+
+**webpack.config.js**
+```js
+[
+  new UglifyJsPlugin({
+    warningsFilter: (src) => true
+  })
+]
+```
+
+<h2 align="center">Maintainers</h2>
+
+<table>
+  <tbody>
+    <tr>
+      <td align="center">
+        <a href="https://github.com/hulkish">
+          <img width="150" height="150" src="https://github.com/hulkish.png?size=150">
+          </br>
+          Steven Hargrove
+        </a>
+      </td>
+      <td align="center">
+        <a href="https://github.com/bebraw">
+          <img width="150" height="150" src="https://github.com/bebraw.png?v=3&s=150">
+          </br>
+          Juho Vepsäläinen
+        </a>
+      </td>
+      <td align="center">
+        <a href="https://github.com/d3viant0ne">
+          <img width="150" height="150" src="https://github.com/d3viant0ne.png?v=3&s=150">
+          </br>
+          Joshua Wiens
+        </a>
+      </td>
+      <td align="center">
+        <a href="https://github.com/michael-ciniawsky">
+          <img width="150" height="150" src="https://github.com/michael-ciniawsky.png?v=3&s=150">
+          </br>
+          Michael Ciniawsky
+        </a>
+      </td>
+      <td align="center">
+        <a href="https://github.com/evilebottnawi">
+          <img width="150" height="150" src="https://github.com/evilebottnawi.png?v=3&s=150">
+          </br>
+          Alexander Krasnoyarov
+        </a>
+      </td>
+    </tr>
+  <tbody>
+</table>
+
+
+[npm]: https://img.shields.io/npm/v/uglifyjs-webpack-plugin.svg
+[npm-url]: https://npmjs.com/package/uglifyjs-webpack-plugin
+
+[node]: https://img.shields.io/node/v/uglifyjs-webpack-plugin.svg
+[node-url]: https://nodejs.org
+
+[deps]: https://david-dm.org/webpack-contrib/uglifyjs-webpack-plugin.svg
+[deps-url]: https://david-dm.org/webpack-contrib/uglifyjs-webpack-plugin
+
+[test]: 	https://img.shields.io/circleci/project/github/webpack-contrib/uglifyjs-webpack-plugin.svg
+[test-url]: https://circleci.com/gh/webpack-contrib/uglifyjs-webpack-plugin
+
+[cover]: https://codecov.io/gh/webpack-contrib/uglifyjs-webpack-plugin/branch/master/graph/badge.svg
+[cover-url]: https://codecov.io/gh/webpack-contrib/uglifyjs-webpack-plugin
+
+[chat]: https://img.shields.io/badge/gitter-webpack%2Fwebpack-brightgreen.svg
+[chat-url]: https://gitter.im/webpack/webpack