• Stars
    star
    1,939
  • Rank 23,906 (Top 0.5 %)
  • Language
    JavaScript
  • License
    MIT License
  • Created over 6 years ago
  • Updated 3 months ago

Reviews

There are no reviews yet. Be the first to send feedback to the community and the maintainers!

Repository Details

Terser Plugin

npm node tests cover discussion size

terser-webpack-plugin

This plugin uses terser to minify/minimize your JavaScript.

Getting Started

Webpack v5 comes with the latest terser-webpack-plugin out of the box. If you are using Webpack v5 or above and wish to customize the options, you will still need to install terser-webpack-plugin. Using Webpack v4, you have to install terser-webpack-plugin v4.

To begin, you'll need to install terser-webpack-plugin:

npm install terser-webpack-plugin --save-dev

or

yarn add -D terser-webpack-plugin

or

pnpm add -D terser-webpack-plugin

Then add the plugin to your webpack config. For example:

webpack.config.js

const TerserPlugin = require("terser-webpack-plugin");

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [new TerserPlugin()],
  },
};

And run webpack via your preferred method.

Note about source maps

Works only with source-map, inline-source-map, hidden-source-map and nosources-source-map values for the devtool option.

Why?

  • eval wraps modules in eval("string") and the minimizer does not handle strings.
  • cheap has not column information and minimizer generate only a single line, which leave only a single mapping.

Using supported devtool values enable source map generation.

Options

test

Type:

type test = string | RegExp | Array<string | RegExp>;

Default: /\.m?js(\?.*)?$/i

Test to match files against.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        test: /\.js(\?.*)?$/i,
      }),
    ],
  },
};

include

Type:

type include = string | RegExp | Array<string | RegExp>;

Default: undefined

Files to include.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        include: /\/includes/,
      }),
    ],
  },
};

exclude

Type:

type exclude = string | RegExp | Array<string | RegExp>;

Default: undefined

Files to exclude.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        exclude: /\/excludes/,
      }),
    ],
  },
};

parallel

Type:

type parallel = boolean | number;

Default: true

Use multi-process parallel running to improve the build speed. Default number of concurrent runs: os.cpus().length - 1.

Note

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

Warning

If you use Circle CI or any other environment that doesn't provide real available count of CPUs then you need to setup explicitly number of CPUs to avoid Error: Call retries were exceeded (see #143, #202).

boolean

Enable/disable multi-process parallel running.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        parallel: true,
      }),
    ],
  },
};

number

Enable multi-process parallel running and set number of concurrent runs.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        parallel: 4,
      }),
    ],
  },
};

minify

Type:

type minify = (
  input: {
    [file: string]: string;
  },
  sourceMap: import("@jridgewell/trace-mapping").SourceMapInput | undefined,
  minifyOptions: {
    module?: boolean | undefined;
    ecma?: import("terser").ECMA | undefined;
  },
  extractComments:
    | boolean
    | "all"
    | "some"
    | RegExp
    | ((
        astNode: any,
        comment: {
          value: string;
          type: "comment1" | "comment2" | "comment3" | "comment4";
          pos: number;
          line: number;
          col: number;
        }
      ) => boolean)
    | {
        condition?:
          | boolean
          | "all"
          | "some"
          | RegExp
          | ((
              astNode: any,
              comment: {
                value: string;
                type: "comment1" | "comment2" | "comment3" | "comment4";
                pos: number;
                line: number;
                col: number;
              }
            ) => boolean)
          | undefined;
        filename?: string | ((fileData: any) => string) | undefined;
        banner?:
          | string
          | boolean
          | ((commentsFile: string) => string)
          | undefined;
      }
    | undefined
) => Promise<{
  code: string;
  map?: import("@jridgewell/trace-mapping").SourceMapInput | undefined;
  errors?: (string | Error)[] | undefined;
  warnings?: (string | Error)[] | undefined;
  extractedComments?: string[] | undefined;
}>;

Default: TerserPlugin.terserMinify

Allows you to override default minify function. By default plugin uses terser package. Useful for using and testing unpublished versions or forks.

Warning

Always use require inside minify function when parallel option enabled.

webpack.config.js

// Can be async
const minify = (input, sourceMap, minimizerOptions, extractsComments) => {
  // The `minimizerOptions` option contains option from the `terserOptions` option
  // You can use `minimizerOptions.myCustomOption`

  // Custom logic for extract comments
  const { map, code } = require("uglify-module") // Or require('./path/to/uglify-module')
    .minify(input, {
      /* Your options for minification */
    });

  return { map, code, warnings: [], errors: [], extractedComments: [] };
};

// Used to regenerate `fullhash`/`chunkhash` between different implementation
// Example: you fix a bug in custom minimizer/custom function, but unfortunately webpack doesn't know about it, so you will get the same fullhash/chunkhash
// to avoid this you can provide version of your custom minimizer
// You don't need if you use only `contenthash`
minify.getMinimizerVersion = () => {
  let packageJson;

  try {
    // eslint-disable-next-line global-require, import/no-extraneous-dependencies
    packageJson = require("uglify-module/package.json");
  } catch (error) {
    // Ignore
  }

  return packageJson && packageJson.version;
};

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          myCustomOption: true,
        },
        minify,
      }),
    ],
  },
};

terserOptions

Type:

type terserOptions = {
  compress?: boolean | CompressOptions;
  ecma?: ECMA;
  enclose?: boolean | string;
  ie8?: boolean;
  keep_classnames?: boolean | RegExp;
  keep_fnames?: boolean | RegExp;
  mangle?: boolean | MangleOptions;
  module?: boolean;
  nameCache?: object;
  format?: FormatOptions;
  /** @deprecated */
  output?: FormatOptions;
  parse?: ParseOptions;
  safari10?: boolean;
  sourceMap?: boolean | SourceMapOptions;
  toplevel?: boolean;
};

Default: default

Terser options.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          ecma: undefined,
          parse: {},
          compress: {},
          mangle: true, // Note `mangle.properties` is `false` by default.
          module: false,
          // Deprecated
          output: null,
          format: null,
          toplevel: false,
          nameCache: null,
          ie8: false,
          keep_classnames: undefined,
          keep_fnames: false,
          safari10: false,
        },
      }),
    ],
  },
};

extractComments

Type:

type extractComments =
  | boolean
  | string
  | RegExp
  | ((
      astNode: any,
      comment: {
        value: string;
        type: "comment1" | "comment2" | "comment3" | "comment4";
        pos: number;
        line: number;
        col: number;
      }
    ) => boolean)
  | {
      condition?:
        | boolean
        | "all"
        | "some"
        | RegExp
        | ((
            astNode: any,
            comment: {
              value: string;
              type: "comment1" | "comment2" | "comment3" | "comment4";
              pos: number;
              line: number;
              col: number;
            }
          ) => boolean)
        | undefined;
      filename?: string | ((fileData: any) => string) | undefined;
      banner?:
        | string
        | boolean
        | ((commentsFile: string) => string)
        | undefined;
    };

Default: true

Whether comments shall be extracted to a separate file, (see details). By default extract only comments using /^\**!|@preserve|@license|@cc_on/i regexp condition and remove remaining comments. If the original file is named foo.js, then the comments will be stored to foo.js.LICENSE.txt. The terserOptions.format.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.

boolean

Enable/disable extracting comments.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: true,
      }),
    ],
  },
};

string

Extract all or some (use /^\**!|@preserve|@license|@cc_on/i RegExp) comments.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: "all",
      }),
    ],
  },
};

RegExp

All comments that match the given expression will be extracted to the separate file.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: /@extract/i,
      }),
    ],
  },
};

function

All comments that match the given expression will be extracted to the separate file.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: (astNode, comment) => {
          if (/@extract/i.test(comment.value)) {
            return true;
          }

          return false;
        },
      }),
    ],
  },
};

object

Allow to customize condition for extract comments, specify extracted file name and banner.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: {
          condition: /^\**!|@preserve|@license|@cc_on/i,
          filename: (fileData) => {
            // The "fileData" argument contains object with "filename", "basename", "query" and "hash"
            return `${fileData.filename}.LICENSE.txt${fileData.query}`;
          },
          banner: (licenseFile) => {
            return `License information can be found in ${licenseFile}`;
          },
        },
      }),
    ],
  },
};
condition

Type:

type condition =
  | boolean
  | "all"
  | "some"
  | RegExp
  | ((
      astNode: any,
      comment: {
        value: string;
        type: "comment1" | "comment2" | "comment3" | "comment4";
        pos: number;
        line: number;
        col: number;
      }
    ) => boolean)
  | undefined;

Condition what comments you need extract.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: {
          condition: "some",
          filename: (fileData) => {
            // The "fileData" argument contains object with "filename", "basename", "query" and "hash"
            return `${fileData.filename}.LICENSE.txt${fileData.query}`;
          },
          banner: (licenseFile) => {
            return `License information can be found in ${licenseFile}`;
          },
        },
      }),
    ],
  },
};
filename

Type:

type filename = string | ((fileData: any) => string) | undefined;

Default: [file].LICENSE.txt[query]

Available placeholders: [file], [query] and [filebase] ([base] for webpack 5).

The file where the extracted comments will be stored. Default is to append the suffix .LICENSE.txt to the original filename.

Warning

We highly recommend using the txt extension. Using js/cjs/mjs extensions may conflict with existing assets which leads to broken code.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: {
          condition: /^\**!|@preserve|@license|@cc_on/i,
          filename: "extracted-comments.js",
          banner: (licenseFile) => {
            return `License information can be found in ${licenseFile}`;
          },
        },
      }),
    ],
  },
};
banner

Type:

type banner = string | boolean | ((commentsFile: string) => string) | undefined;

Default: /*! For license information please see ${commentsFile} */

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.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: {
          condition: true,
          filename: (fileData) => {
            // The "fileData" argument contains object with "filename", "basename", "query" and "hash"
            return `${fileData.filename}.LICENSE.txt${fileData.query}`;
          },
          banner: (commentsFile) => {
            return `My custom banner about license information ${commentsFile}`;
          },
        },
      }),
    ],
  },
};

Examples

Preserve Comments

Extract all legal comments (i.e. /^\**!|@preserve|@license|@cc_on/i) and preserve /@license/i comments.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          format: {
            comments: /@license/i,
          },
        },
        extractComments: true,
      }),
    ],
  },
};

Remove Comments

If you avoid building with comments, use this config:

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          format: {
            comments: false,
          },
        },
        extractComments: false,
      }),
    ],
  },
};

UglifyJS is a JavaScript parser, minifier, compressor and beautifier toolkit.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        minify: TerserPlugin.uglifyJsMinify,
        // `terserOptions` options will be passed to `uglify-js`
        // Link to options - https://github.com/mishoo/UglifyJS#minify-options
        terserOptions: {},
      }),
    ],
  },
};

swc is a super-fast compiler written in rust; producing widely-supported javascript from modern standards and typescript.

Warning

the extractComments option is not supported and all comments will be removed by default, it will be fixed in future

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        minify: TerserPlugin.swcMinify,
        // `terserOptions` options will be passed to `swc` (`@swc/core`)
        // Link to options - https://swc.rs/docs/config-js-minify
        terserOptions: {},
      }),
    ],
  },
};

esbuild is an extremely fast JavaScript bundler and minifier.

Warning

the extractComments option is not supported and all legal comments (i.e. copyright, licenses and etc) will be preserved

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        minify: TerserPlugin.esbuildMinify,
        // `terserOptions` options will be passed to `esbuild`
        // Link to options - https://esbuild.github.io/api/#minify
        // Note: the `minify` options is true by default (and override other `minify*` options), so if you want to disable the `minifyIdentifiers` option (or other `minify*` options) please use:
        // terserOptions: {
        //   minify: false,
        //   minifyWhitespace: true,
        //   minifyIdentifiers: false,
        //   minifySyntax: true,
        // },
        terserOptions: {},
      }),
    ],
  },
};

Custom Minify Function

Override default minify function - use uglify-js for minification.

webpack.config.js

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        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);
        },
      }),
    ],
  },
};

Typescript

With default terser minify function:

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          compress: true,
        },
      }),
    ],
  },
};

With built-in minify functions:

import type { JsMinifyOptions as SwcOptions } from "@swc/core";
import type { MinifyOptions as UglifyJSOptions } from "uglify-js";
import type { TransformOptions as EsbuildOptions } from "esbuild";
import type { MinifyOptions as TerserOptions } from "terser";

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin<SwcOptions>({
        minify: TerserPlugin.swcMinify,
        terserOptions: {
          // `swc` options
        },
      }),
      new TerserPlugin<UglifyJSOptions>({
        minify: TerserPlugin.uglifyJsMinify,
        terserOptions: {
          // `uglif-js` options
        },
      }),
      new TerserPlugin<EsbuildOptions>({
        minify: TerserPlugin.esbuildMinify,
        terserOptions: {
          // `esbuild` options
        },
      }),

      // Alternative usage:
      new TerserPlugin<TerserOptions>({
        minify: TerserPlugin.terserMinify,
        terserOptions: {
          // `terser` options
        },
      }),
    ],
  },
};

Contributing

Please take a moment to read our contributing guidelines if you haven't yet done so.

CONTRIBUTING

License

MIT

More Repositories

1

webpack-bundle-analyzer

Webpack plugin and CLI utility that represents bundle content as convenient interactive zoomable treemap
JavaScript
12,576
star
2

mini-css-extract-plugin

Lightweight CSS extraction plugin
JavaScript
4,654
star
3

awesome-webpack

A curated list of awesome Webpack resources, libraries and tools
HTML
4,588
star
4

css-loader

CSS Loader
JavaScript
4,300
star
5

extract-text-webpack-plugin

[DEPRECATED] Please use https://github.com/webpack-contrib/mini-css-extract-plugin Extracts text from a bundle into a separate file
JavaScript
4,014
star
6

sass-loader

Compiles Sass to CSS
JavaScript
3,899
star
7

postcss-loader

PostCSS loader for webpack
JavaScript
2,855
star
8

copy-webpack-plugin

Copy files and directories with webpack
JavaScript
2,836
star
9

webpack-hot-middleware

Webpack hot reloading you can attach to your own server
JavaScript
2,336
star
10

file-loader

File Loader
JavaScript
1,861
star
11

style-loader

Style Loader
JavaScript
1,651
star
12

worker-loader

A webpack loader that registers a script as a Web Worker
JavaScript
1,455
star
13

install-webpack-plugin

Speed up development by automatically installing & saving dependencies with Webpack.
JavaScript
1,430
star
14

compression-webpack-plugin

Prepare compressed versions of assets to serve them with Content-Encoding
JavaScript
1,409
star
15

url-loader

A loader for webpack which transforms files into base64 URIs
JavaScript
1,403
star
16

uglifyjs-webpack-plugin

[deprecated] UglifyJS Plugin
JavaScript
1,382
star
17

html-loader

HTML Loader
JavaScript
1,164
star
18

thread-loader

Runs the following loaders in a worker pool
JavaScript
1,121
star
19

webpack-serve

Repository has moved:
JavaScript
1,092
star
20

eslint-loader

[DEPRECATED] A ESlint loader for webpack
JavaScript
1,057
star
21

less-loader

Compiles Less to CSS
JavaScript
956
star
22

raw-loader

A loader for webpack that allows importing files as a String
JavaScript
844
star
23

purifycss-webpack

UNMAINTAINED, use https://github.com/FullHuman/purgecss-webpack-plugin
JavaScript
772
star
24

bundle-loader

Bundle Loader
JavaScript
658
star
25

cache-loader

[DEPRECATED] Caches the result of following loaders on disk
JavaScript
638
star
26

expose-loader

Expose Loader
JavaScript
546
star
27

imports-loader

Imports Loader
JavaScript
519
star
28

stylus-loader

🎨 A stylus loader for webpack.
JavaScript
499
star
29

babel-minify-webpack-plugin

[DEPRECATED] Babel Minify Webpack Plugin
JavaScript
493
star
30

svg-inline-loader

Inline SVG loader with cleaning-up functionality
JavaScript
490
star
31

json-loader

json loader module for webpack - UNMAINTAINED
JavaScript
436
star
32

closure-webpack-plugin

Webpack Google Closure Compiler and Closure Library plugin -
JavaScript
434
star
33

stylelint-webpack-plugin

A Stylelint plugin for webpack
JavaScript
426
star
34

source-map-loader

extract sourceMappingURL comments from modules and offer it to webpack
JavaScript
362
star
35

script-loader

[deprecated] Script Loader
JavaScript
325
star
36

i18n-webpack-plugin

[DEPRECATED] Embed localization into your bundle
JavaScript
317
star
37

css-minimizer-webpack-plugin

cssnano plugin for Webpack
JavaScript
315
star
38

istanbul-instrumenter-loader

Istanbul Instrumenter Loader
JavaScript
273
star
39

grunt-webpack

integrate webpack into grunt build process
JavaScript
267
star
40

react-proxy-loader

Wraps a react component in a proxy component to enable Code Splitting.
JavaScript
259
star
41

eslint-webpack-plugin

A ESLint plugin for webpack
JavaScript
257
star
42

image-minimizer-webpack-plugin

Webpack loader and plugin to compress images using imagemin
JavaScript
235
star
43

exports-loader

Exports Loader
JavaScript
216
star
44

webpack-command

[DEPRECATED] Lightweight, modular, and opinionated webpack CLI that provides a superior experience
JavaScript
212
star
45

webpack-stylish

A stylish, optionated reporter for webpack
JavaScript
200
star
46

val-loader

val loader module for webpack
JavaScript
183
star
47

mocha-loader

Mocha Loader
JavaScript
146
star
48

null-loader

[DEPRECATED] A loader that returns an empty module (can still be used for webpack 4).
JavaScript
145
star
49

coffee-loader

CoffeeScript Loader
JavaScript
144
star
50

webpack-hot-client

webpack HMR Client
JavaScript
121
star
51

node-loader

node loader for native modules
JavaScript
117
star
52

transform-loader

transform loader for webpack
JavaScript
110
star
53

webpack-defaults

Defaults to be shared across webpack projects
JavaScript
108
star
54

json5-loader

[Deprecated] JSON5 loader for Webpack (can still be used for webpack 4)
JavaScript
72
star
55

jshint-loader

[DEPRECATED] jshint loader for webpack, please migrate on `eslint`
JavaScript
67
star
56

webpack-canary

Canary tooling for checking webpack dependencies against specific webpack versions
JavaScript
47
star
57

multi-loader

[DEPRECATED] A loader that splits a module into multiple modules loaded with different loaders.
JavaScript
44
star
58

webpack-log

[DEPRECATED] Please use logger API https://github.com/webpack/webpack/pull/9436
JavaScript
38
star
59

zopfli-webpack-plugin

[DEPRECATED] Prepare compressed versions of assets with node-zopfli
JavaScript
26
star
60

component-webpack-plugin

Use components with webpack - UNMAINTAINED
JavaScript
20
star
61

remark-loader

Load markdown through remark with image resolving and some react-specific features.
JavaScript
16
star
62

json-minimizer-webpack-plugin

JSON minimizer webpack plugin
JavaScript
15
star
63

gzip-loader

[DEPRECATED] gzip loader module for webpack
JavaScript
15
star
64

yaml-frontmatter-loader

[DEPRECATED] Yaml frontmatter loader
JavaScript
14
star
65

config-loader

[DEPRECATED] A loader for webpack configuration files
JavaScript
14
star
66

html-minimizer-webpack-plugin

HTML minimizer webpack plugin
JavaScript
14
star
67

organization

Applications, Standards & Documentation for webpack-contrib.
13
star
68

i18n-loader

i18n loader module for webpack - UNMAINTAINED
JavaScript
11
star
69

eslint-config-webpack

Webpack standard eslint configuration
JavaScript
10
star
70

coffee-redux-loader

coffee redux loader module for webpack - UNMAINTAINED
JavaScript
7
star
71

test-utils

webpack Loader/Plugin Test Helpers
JavaScript
6
star
72

coverjs-loader

coverjs loader module for webpack - UNMAINTAINED
JavaScript
4
star
73

circleci-node8

[DEPRECATED] Please migrate on azure pipelines. CircleCI 2.0 NodeJS 8 build container -
Dockerfile
3
star
74

restyle-loader

[DEPRECATED] Use https://github.com/danielverejan/restyle-loader
JavaScript
3
star
75

tag-versions

A commandline wrapper around omichelsen/compare-versions to compare dist-tags
JavaScript
2
star
76

circleci-node-base

CircleCI 2.0 base build container -
Dockerfile
1
star
77

babel-preset-webpack

[DEPRECATED] Webpack Organization es2015 Babel Preset - See:
JavaScript
1
star
78

circleci-node9

[DEPRECATED] Please migrate on azure pipelines. CircleCI 2.0 NodeJS 9 build container -
Dockerfile
1
star
79

circleci-node-jdk8

Deprecated, use ->
1
star
80

cli-utils

[DEPRECATED] A suite of utilities for webpack projects which expose a CLI
JavaScript
1
star