uglifyjs-webpack-plugin3

UglifyJS Webpack Plugin

This plugin uses UglifyJS v3 to minify your JavaScript

ℹ️ webpack contains the same plugin under webpack.optimize.UglifyJsPlugin. The documentation is valid apart from the installation instructions

Install

npm i -D uglifyjs-webpack-plugin

Usage

webpack.config.js

const UglifyJSPlugin = require('uglifyjs-webpack-plugin')

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

Options

Name	Type	Default	Description
test	{RegExp|Array<RegExp>}	/.js($|?)/i	Test to match files against
include	{RegExp|Array<RegExp>}	undefined	Files to include
exclude	{RegExp|Array<RegExp>}	undefined	Files to exclude
parallel	{Boolean|Object}	false	Use multi-process parallel running and file cache 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}}	``	Allow to filter uglify warnings

test

webpack.config.js

[
  new UglifyJSPlugin({
    test: /\.js($|\?)/i
  })
]

include

webpack.config.js

[
  new UglifyJSPlugin({
    include: /\/includes/
  })
]

exclude

webpack.config.js

[
  new UglifyJSPlugin({
    exclude: /\/excludes/
  })
]

parallel

webpack.config.js

[
  new UglifyJSPlugin({
    parallel: true
  })
]

Name	Type	Default	Description
cache	{Boolean}	node_modules/.cache/uglifyjs-webpack-plugin	Enable file caching
workers	{Boolean|Object}	os.cpus().length - 1	Number of concurrent runs, default is the maximum

webpack.config.js

[
  new UglifyJSPlugin({
    parallel: {
      cache: true
      workers: 2 // for e.g
    }
  })
]

ℹ️ Parallelization can speedup your build significantly and is therefore highly recommended

sourceMap

webpack.config.js

[
  new UglifyJSPlugin({
    sourceMap: true
  })
]

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

uglifyOptions

Name	Type	Default	Description
ie8	{Boolean}	false	Enable IE8 Support
ecma	{Number}	undefined	Supported ECMAScript Version (5, 6, 7 or 8). Affects parse, compress && output options
parse	{Object}	{}	Additional Parse 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)
compress	{Boolean|Object}	true	Additional Compress Options
warnings	{Boolean}	false	Display Warnings

webpack.config.js

[
  new UglifyJSPlugin({
    uglifyOptions: {
      ie8: false,
      ecma: 8,
      parse: {...options},
      mangle: {
        ...options,
        properties: {
          // mangle property options
        }
      },
      output: {
        comments: false,
        beautify: false,
        ...options
      },
      compress: {...options},
      warnings: 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}	compilation.assets[file]	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

[
  new UglifyJsPlugin({
    warningsFilter: (src) => true
  })
]

Maintainers

Steven Hargrove

Juho Vepsäläinen

Joshua Wiens

Michael Ciniawsky

Alexander Krasnoyarov