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UglifyjsWebpackPlugin

<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>

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

⚠️ The following options are for the latest beta version. If you would like to see the options for the latest built-in version of the plugin in webpack, see the v0.4.6 docs.

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}
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}}
undefined
Allow to filter uglify warnings

test

webpack.config.js

[
  new UglifyJSPlugin({
    test: /\.js($&#124;\?)/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|Number}
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
{Object}
{}
Additional Parse Options
{Boolean|Object}
true
Enable Name Mangling (See Mangle Properties for advanced setups, use with ⚠️)
{Object}
{}
Additional Output Options (The defaults are optimized for best compression)
{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
  })
]

© JS Foundation and other contributors
Licensed under the Creative Commons Attribution License 4.0.
https://webpack.js.org/plugins/uglifyjs-webpack-plugin