ℹ️ webpack < v4.0.0 currently contains v0.4.6 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

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}`	/\.js$/i
include	`{RegExp\	Array}`	undefined
exclude	`{RegExp\	Array}`	undefined
cache	`{Boolean\	String}`	false
parallel	`{Boolean\	Number}`	false
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\
warningsFilter	{Function(source) -> {Boolean}}	() => true	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/
  })
]

cache

{Boolean}

webpack.config.js

[
  new UglifyJsPlugin({
    cache: true
  })
]

Enable file caching. Default path to cache directory: node_modules/.cache/uglifyjs-webpack-plugin.

{String}

webpack.config.js

[
  new UglifyJsPlugin({
    cache: 'path/to/cache'
  })
]

Path to cache directory.

parallel

{Boolean}

webpack.config.js

[
  new UglifyJsPlugin({
    parallel: true
  })
]

Enable parallelization. Default number of concurrent runs: os.cpus().length - 1.

{Number}

webpack.config.js

[
  new UglifyJsPlugin({
    parallel: 4
  })
]

Number of concurrent runs.

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
ecma	{Number}	undefined	Supported ECMAScript Version (5, 6, 7 or 8). Affects parse, compress && output options
warnings	{Boolean}	false	Display Warnings
parse	{Object}	{}	Additional Parse Options
compress	`{Boolean\	Object}`	true
mangle	`{Boolean\	Object}`	{inline: false}
output	{Object}	`{comments: extractComments ? false : /**!\	@preserve\
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

[
  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}`	``
filename	`{String\	Function}`	${file}.LICENSE
banner	`{Boolean\	String\	Function}`

warningsFilter

webpack.config.js

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

Maintainers

Steven Hargrove

Juho Vepsäläinen

Joshua Wiens

Michael Ciniawsky

Alexander Krasnoyarov