[![npm][npm]][npm-url]
[![node][node]][node-url]
[![deps][deps]][deps-url]
[![test][test]][test-url]
[![coverage][cover]][cover-url]
[![chat][chat]][chat-url]

src="https://cdn.rawgit.com/webpack/media/e7485eb2/logo/icon.svg">

UglifyJS Webpack Plugin

This plugin uses UglifyJS v3 to minify your JavaScript

Install

``bash
npm i -D uglifyjs-3-webpack-plugin
`

Usage

webpack.config.js
`js
const UglifyJsPlugin = require('uglifyjs-3-webpack-plugin')

module.exports = {
plugins: [
new UglifyJsPlugin()
]
}
`

Options

|Name|Type|Default|Description|
|:--:|:--:|:-----:|:----------|
|test|{RegExp\|Array}| /\\.js$/i|Test to match files against|
|include|{RegExp\|Array}|undefined|Files to include|
|exclude|{RegExp\|Array}|undefined|Files to exclude|
|cache|{Boolean\|String}|false|Enable file caching|
|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|
|uglifyOptions|{Object}|{...defaults}|uglify Options|
|extractComments|{Boolean\|RegExp\|Function<(node, comment) -> {Boolean\|Object}>}|false|Whether comments shall be extracted to a separate file, (see details (webpack >= 2.3.0)|
|warningsFilter|{Function(source) -> {Boolean}}|() => true|Allow to filter uglify warnings|

$3

webpack.config.js
`js
[
new UglifyJsPlugin({
test: /\.js($|\?)/i
})
]
`

$3

webpack.config.js
`js
[
new UglifyJsPlugin({
include: /\/includes/
})
]
`

$3

webpack.config.js
`js
[
new UglifyJsPlugin({
exclude: /\/excludes/
})
]
`

$3

#### {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.

$3

#### {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

$3

webpack.config.js
`js
[
new UglifyJsPlugin({
sourceMap: true
})
]
`

> ⚠️ cheap-source-map options don't work with this plugin

$3

|Name|Type|Default|Description|
|:--:|:--:|:-----:|:----------|
|warnings|{Boolean}|false|Display Warnings|
|parse|{Object}|{}|Additional Parse Options|
|compress|{Boolean\|Object}|true|Additional Compress Options|
|mangle|{Boolean\|Object}|true|Enable Name Mangling (See Mangle Properties for advanced setups, use with ⚠️)|
|output|{Object}|{}|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_fnames|{Boolean}|false| Enable prevent discarding or mangling of function names. Useful for code relying on Function.prototype.name.|

webpack.config.js
`js
[
new UglifyJsPlugin({
uglifyOptions: {
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_fnames: false,
}
})
]
`

$3

#### {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|

$3

webpack.config.js
`js
[
new UglifyJsPlugin({
warningsFilter: (src) => true
})
]
``

Maintainers

Steven Hargrove

Juho Vepsäläinen

Joshua Wiens

Michael Ciniawsky

Alexander Krasnoyarov

[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