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Terser Plugin

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webpack/terser-webpack-plugin

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terser-webpack-plugin

This plugin usesterser to minify/minimize your JavaScript.

Getting Started

Webpack v5 comes with the latestterser-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 installterser-webpack-plugin.Using Webpack v4, you have to installterser-webpack-plugin v4.

To begin, you'll need to installterser-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 yourwebpack configuration. For example:

webpack.config.js

constTerserPlugin=require("terser-webpack-plugin");module.exports={optimization:{minimize:true,minimizer:[newTerserPlugin()],},};

Finally, runwebpack using the method you normally use (e.g., via CLI or an npm script).

Note about source maps

Works only withsource-map,inline-source-map,hidden-source-map andnosources-source-map values for thedevtool option.

Why?

  • eval wraps modules ineval("string") and the minimizer does not handle strings.
  • cheap has no column information and the minimizer generates only a single line, which leaves only a single mapping.

Using supporteddevtool values enable source map generation.

Options

test

Type:

typetest=string|RegExp|(string|RegExp)[];

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

Test to match files against.

webpack.config.js

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

include

Type:

typeinclude=string|RegExp|(string|RegExp)[];

Default:undefined

Files to include.

webpack.config.js

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

exclude

Type:

typeexclude=string|RegExp|(string|RegExp)[];

Default:undefined

Files to exclude.

webpack.config.js

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

parallel

Type:

typeparallel=boolean|number;

Default:true

Use multi-process parallel running to improve the build speed.

Default number of concurrent runs:os.cpus().length - 1 oros.availableParallelism() - 1 (if this function is supported).

Note

Parallelization can speedup your build significantly and is thereforehighly recommended.

Warning

If you useCircle CI or any other environment that doesn't provide the real available count of CPUs then you need to explicitly set up the number of CPUs to avoidError: Call retries were exceeded (see#143,#202).

boolean

Enable/disable multi-process parallel running.

webpack.config.js

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

number

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

webpack.config.js

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

minify

Type:

typeminify=(input:Record<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 the default minify function.By default plugin usesterser package.Useful for using and testing unpublished versions or forks.

Warning

Always userequire insideminify function whenparallel option enabled.

webpack.config.js

// Can be asyncconstminify=(input,sourceMap,minimizerOptions,extractsComments)=>{// The `minimizerOptions` option contains option from the `terserOptions` option// You can use `minimizerOptions.myCustomOption`// Custom logic for extract commentsconst{ 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=()=>{letpackageJson;try{packageJson=require("uglify-module/package.json");}catch(error){// Ignore}returnpackageJson&&packageJson.version;};module.exports={optimization:{minimize:true,minimizer:[newTerserPlugin({terserOptions:{myCustomOption:true,},        minify,}),],},};

terserOptions

Type:

interfaceterserOptions{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

Terseroptions.

webpack.config.js

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

extractComments

Type:

typeextractComments=|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, (seedetails).

By default, extract only comments using/^\**!|@preserve|@license|@cc_on/i RegExp condition and remove remaining comments.

If the original file is namedfoo.js, then the comments will be stored tofoo.js.LICENSE.txt.

TheterserOptions.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 preserve comments that have already been extracted.

boolean

Enable/disable extracting comments.

webpack.config.js

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

string

Extractall orsome (use the/^\**!|@preserve|@license|@cc_on/i RegExp) comments.

webpack.config.js

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

RegExp

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

webpack.config.js

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

function

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

webpack.config.js

module.exports={optimization:{minimize:true,minimizer:[newTerserPlugin({extractComments:(astNode,comment)=>{if(/@extract/i.test(comment.value)){returntrue;}returnfalse;},}),],},};

object

Allows you to customize condition for extracting comments, and specify the extracted file name and banner.

webpack.config.js

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

Type:

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

The condition that determines which comments should be extracted.

webpack.config.js

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

Type:

typefilename=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:[newTerserPlugin({extractComments:{condition:/^\**!|@preserve|@license|@cc_on/i,filename:"extracted-comments.js",banner:(licenseFile)=>`License information can be found in${licenseFile}`,},}),],},};
banner

Type:

typebanner=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 at the top of the original file.

It can befalse (no banner), aString, or afunction<(string) -> String> that will be called with the filename where the extracted comments have been stored.

The banner will be wrapped in a comment.

webpack.config.js

module.exports={optimization:{minimize:true,minimizer:[newTerserPlugin({extractComments:{condition:true,filename:(fileData)=>// The "fileData" argument contains object with "filename", "basename", "query" and "hash"`${fileData.filename}.LICENSE.txt${fileData.query}`,banner:(commentsFile)=>`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:[newTerserPlugin({terserOptions:{format:{comments:/@license/i,},},extractComments:true,}),],},};

Remove Comments

If you want to build without comments, use this config:

webpack.config.js

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

swc is a super-fast compiler written inRust, producing widely supported JavaScript from modern standards and TypeScript.

Warning

TheextractComments option is not supported, and all comments will be removed by default. This will be fixed in future

webpack.config.js

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

esbuild is an extremely fast JavaScript bundler and minifier.

Warning

TheextractComments 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:[newTerserPlugin({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 the default minify function - useuglify-js for minification.

webpack.config.js

module.exports={optimization:{minimize:true,minimizer:[newTerserPlugin({minify:(file,sourceMap)=>{// https://github.com/mishoo/UglifyJS2#minify-optionsconstuglifyJsOptions={/* your `uglify-js` package options */};if(sourceMap){uglifyJsOptions.sourceMap={content:sourceMap,};}returnrequire("uglify-js").minify(file,uglifyJsOptions);},}),],},};

Typescript

With default Terser minify function:

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

With built-in minify functions:

import{typeJsMinifyOptionsasSwcOptions}from"@swc/core";import{typeTransformOptionsasEsbuildOptions}from"esbuild";import{typeMinifyOptionsasTerserOptions}from"terser";import{typeMinifyOptionsasUglifyJSOptions}from"uglify-js";module.exports={optimization:{minimize:true,minimizer:[newTerserPlugin<SwcOptions>({minify:TerserPlugin.swcMinify,terserOptions:{// `swc` options},}),newTerserPlugin<UglifyJSOptions>({minify:TerserPlugin.uglifyJsMinify,terserOptions:{// `uglif-js` options},}),newTerserPlugin<EsbuildOptions>({minify:TerserPlugin.esbuildMinify,terserOptions:{// `esbuild` options},}),// Alternative usage:newTerserPlugin<TerserOptions>({minify:TerserPlugin.terserMinify,terserOptions:{// `terser` options},}),],},};

Contributing

We welcome all contributions!If you're new here, please take a moment to review our contributing guidelines before submitting issues or pull requests.

CONTRIBUTING

License

MIT

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