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\n \n \n \n
\n\n[![npm][npm]][npm-url]\n[![node][node]][node-url]\n[![deps][deps]][deps-url]\n[![tests][tests]][tests-url]\n[![cover][cover]][cover-url]\n[![chat][chat]][chat-url]\n[![size][size]][size-url]\n\n# terser-webpack-plugin\n\nThis plugin uses [terser](https://github.com/terser-js/terser) to minify your JavaScript.\n\n> ℹ️ For `webpack@3` use [terser-webpack-plugin-legacy](https://www.npmjs.com/package/terser-webpack-plugin-legacy) package\n\n## Getting Started\n\nTo begin, you'll need to install `terser-webpack-plugin`:\n\n```console\n$ npm install terser-webpack-plugin --save-dev\n```\n\nThen add the plugin to your `webpack` config. For example:\n\n**webpack.config.js**\n\n```js\nconst TerserPlugin = require('terser-webpack-plugin');\n\nmodule.exports = {\n optimization: {\n minimizer: [new TerserPlugin()],\n },\n};\n```\n\nAnd run `webpack` via your preferred method.\n\n## Options\n\n### `test`\n\nType: `String|RegExp|Array`\nDefault: `/\\.m?js(\\?.*)?$/i`\n\nTest to match files against.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n test: /\\.js(\\?.*)?$/i,\n }),\n ],\n },\n};\n```\n\n### `include`\n\nType: `String|RegExp|Array`\nDefault: `undefined`\n\nFiles to include.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n include: /\\/includes/,\n }),\n ],\n },\n};\n```\n\n### `exclude`\n\nType: `String|RegExp|Array`\nDefault: `undefined`\n\nFiles to exclude.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n exclude: /\\/excludes/,\n }),\n ],\n },\n};\n```\n\n### `chunkFilter`\n\nType: `Function<(chunk) -> boolean>`\nDefault: `() => true`\n\nAllowing to filter which chunks should be uglified (by default all chunks are uglified).\nReturn `true` to uglify the chunk, `false` otherwise.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n chunkFilter: (chunk) => {\n // Exclude uglification for the `vendor` chunk\n if (chunk.name === 'vendor') {\n return false;\n }\n\n return true;\n },\n }),\n ],\n },\n};\n```\n\n### `cache`\n\nType: `Boolean|String`\nDefault: `false`\n\nEnable file caching.\nDefault path to cache directory: `node_modules/.cache/terser-webpack-plugin`.\n\n> ℹ️ If you use your own `minify` function please read the `minify` section for cache invalidation correctly.\n\n#### `Boolean`\n\nEnable/disable file caching.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n cache: true,\n }),\n ],\n },\n};\n```\n\n#### `String`\n\nEnable file caching and set path to cache directory.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n cache: 'path/to/cache',\n }),\n ],\n },\n};\n```\n\n### `cacheKeys`\n\nType: `Function<(defaultCacheKeys, file) -> Object>`\nDefault: `defaultCacheKeys => defaultCacheKeys`\n\nAllows you to override default cache keys.\n\nDefault cache keys:\n\n```js\n({\n terser: require('terser/package.json').version, // terser version\n 'terser-webpack-plugin': require('../package.json').version, // plugin version\n 'terser-webpack-plugin-options': this.options, // plugin options\n path: compiler.outputPath ? `${compiler.outputPath}/${file}` : file, // asset path\n hash: crypto\n .createHash('md4')\n .update(input)\n .digest('hex'), // source file hash\n});\n```\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n cache: true,\n cacheKeys: (defaultCacheKeys, file) => {\n defaultCacheKeys.myCacheKey = 'myCacheKeyValue';\n\n return defaultCacheKeys;\n },\n }),\n ],\n },\n};\n```\n\n### `parallel`\n\nType: `Boolean|Number`\nDefault: `false`\n\nUse multi-process parallel running to improve the build speed.\nDefault number of concurrent runs: `os.cpus().length - 1`.\n\n> ℹ️ Parallelization can speedup your build significantly and is therefore **highly recommended**.\n\n#### `Boolean`\n\nEnable/disable multi-process parallel running.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n parallel: true,\n }),\n ],\n },\n};\n```\n\n#### `Number`\n\nEnable multi-process parallel running and set number of concurrent runs.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n parallel: 4,\n }),\n ],\n },\n};\n```\n\n### `sourceMap`\n\nType: `Boolean`\nDefault: `false`\n\nUse source maps to map error message locations to modules (this slows down the compilation).\nIf you use your own `minify` function please read the `minify` section for handling source maps correctly.\n\n> ⚠️ **`cheap-source-map` options don't work with this plugin**.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n sourceMap: true,\n }),\n ],\n },\n};\n```\n\n### `minify`\n\nType: `Function`\nDefault: `undefined`\n\nAllows you to override default minify function.\nBy default plugin uses [terser](https://github.com/terser-js/terser) package.\nUseful for using and testing unpublished versions or forks.\n\n> ⚠️ **Always use `require` inside `minify` function when `parallel` option enabled**.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n minify: (file, sourceMap) => {\n const extractedComments = [];\n\n // Custom logic for extract comments\n\n const { error, map, code, warnings } = require('uglify-module') // Or require('./path/to/uglify-module')\n .minify(file, {\n /* Your options for minification */\n });\n\n return { error, map, code, warnings, extractedComments };\n },\n }),\n ],\n },\n};\n```\n\n### `terserOptions`\n\nType: `Object`\nDefault: [default](https://github.com/terser-js/terser#minify-options)\n\nTerser minify [options](https://github.com/terser-js/terser#minify-options).\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n terserOptions: {\n ecma: undefined,\n warnings: false,\n parse: {},\n compress: {},\n mangle: true, // Note `mangle.properties` is `false` by default.\n module: false,\n output: null,\n toplevel: false,\n nameCache: null,\n ie8: false,\n keep_classnames: undefined,\n keep_fnames: false,\n safari10: false,\n },\n }),\n ],\n },\n};\n```\n\n### `extractComments`\n\nType: `Boolean|String|RegExp|Function<(node, comment) -> Boolean|Object>|Object`\nDefault: `false`\n\nWhether comments shall be extracted to a separate file, (see [details](https://github.com/webpack/webpack/commit/71933e979e51c533b432658d5e37917f9e71595a)).\nBy default extract only comments using `/^\\**!|@preserve|@license|@cc_on/i` regexp condition and remove remaining comments.\nIf the original file is named `foo.js`, then the comments will be stored to `foo.js.LICENSE`.\nThe `terserOptions.output.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.\n\n#### `Boolean`\n\nEnable/disable extracting comments.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n extractComments: true,\n }),\n ],\n },\n};\n```\n\n#### `String`\n\nExtract `all` or `some` (use `/^\\**!|@preserve|@license|@cc_on/i` RegExp) comments.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n extractComments: 'all',\n }),\n ],\n },\n};\n```\n\n#### `RegExp`\n\nAll comments that match the given expression will be extracted to the separate file.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n extractComments: /@extract/i,\n }),\n ],\n },\n};\n```\n\n#### `Function<(node, comment) -> Boolean>`\n\nAll comments that match the given expression will be extracted to the separate file.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n extractComments: (astNode, comment) => {\n if (/@extract/i.test(comment.value)) {\n return true;\n }\n\n return false;\n },\n }),\n ],\n },\n};\n```\n\n#### `Object`\n\nAllow to customize condition for extract comments, specify extracted file name and banner.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n extractComments: {\n condition: /^\\**!|@preserve|@license|@cc_on/i,\n filename: (file) => {\n return `${file}.LICENSE`;\n },\n banner: (licenseFile) => {\n return `License information can be found in ${licenseFile}`;\n },\n },\n }),\n ],\n },\n};\n```\n\n##### `condition`\n\nType: `Boolean|String|RegExp|Function<(node, comment) -> Boolean|Object>`\n\nCondition what comments you need extract.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n extractComments: {\n condition: 'some',\n filename: (file) => {\n return `${file}.LICENSE`;\n },\n banner: (licenseFile) => {\n return `License information can be found in ${licenseFile}`;\n },\n },\n }),\n ],\n },\n};\n```\n\n##### `filename`\n\nType: `String|Function<(string) -> String>`\nDefault: `${file}.LICENSE`\n\nThe file where the extracted comments will be stored.\nDefault is to append the suffix `.LICENSE` to the original filename.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n extractComments: {\n condition: /^\\**!|@preserve|@license|@cc_on/i,\n filename: 'extracted-comments.js',\n banner: (licenseFile) => {\n return `License information can be found in ${licenseFile}`;\n },\n },\n }),\n ],\n },\n};\n```\n\n##### `banner`\n\nType: `Boolean|String|Function<(string) -> String>`\nDefault: `/*! For license information please see ${commentsFile} */`\n\nThe banner text that points to the extracted file and will be added on top of the original file.\nCan be `false` (no banner), a `String`, or a `Function<(string) -> String>` that will be called with the filename where extracted comments have been stored.\nWill be wrapped into comment.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n extractComments: {\n condition: true,\n filename: (file) => {\n return `${file}.LICENSE`;\n },\n banner: (commentsFile) => {\n return `My custom banner about license information ${commentsFile}`;\n },\n },\n }),\n ],\n },\n};\n```\n\n### `warningsFilter`\n\nType: `Function<(warning, source) -> Boolean>`\nDefault: `() => true`\n\nAllow to filter [terser](https://github.com/terser-js/terser) warnings.\nReturn `true` to keep the warning, `false` otherwise.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n warningsFilter: (warning, source) => {\n if (/Dropping unreachable code/i.test(warning)) {\n return true;\n }\n\n if (/filename\\.js/i.test(source)) {\n return true;\n }\n\n return false;\n },\n }),\n ],\n },\n};\n```\n\n## Examples\n\n### Cache And Parallel\n\nEnable cache and multi-process parallel running.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n cache: true,\n parallel: true,\n }),\n ],\n },\n};\n```\n\n### Preserve Comments\n\nExtract all legal comments (i.e. `/^\\**!|@preserve|@license|@cc_on/i`) and preserve `/@license/i` comments.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n terserOptions: {\n output: {\n comments: /@license/i,\n },\n },\n extractComments: true,\n }),\n ],\n },\n};\n```\n\n### Remove Comments\n\nIf you avoid building with comments, set **terserOptions.output.comments** to **false** as in this config:\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n terserOptions: {\n output: {\n comments: false,\n },\n },\n }),\n ],\n },\n};\n```\n\n### Custom Minify Function\n\nOverride default minify function - use `uglify-js` for minification.\n\n**webpack.config.js**\n\n```js\nmodule.exports = {\n optimization: {\n minimizer: [\n new TerserPlugin({\n // Uncomment lines below for cache invalidation correctly\n // cache: true,\n // cacheKeys: (defaultCacheKeys) => {\n // delete defaultCacheKeys.terser;\n //\n // return Object.assign(\n // {},\n // defaultCacheKeys,\n // { 'uglify-js': require('uglify-js/package.json').version },\n // );\n // },\n minify: (file, sourceMap) => {\n // https://github.com/mishoo/UglifyJS2#minify-options\n const uglifyJsOptions = {\n /* your `uglify-js` package options */\n };\n\n if (sourceMap) {\n uglifyJsOptions.sourceMap = {\n content: sourceMap,\n };\n }\n\n return require('uglify-js').minify(file, uglifyJsOptions);\n },\n }),\n ],\n },\n};\n```\n\n## Contributing\n\nPlease take a moment to read our contributing guidelines if you haven't yet done so.\n\n[CONTRIBUTING](./.github/CONTRIBUTING.md)\n\n## License\n\n[MIT](./LICENSE)\n\n[npm]: https://img.shields.io/npm/v/terser-webpack-plugin.svg\n[npm-url]: https://npmjs.com/package/terser-webpack-plugin\n[node]: https://img.shields.io/node/v/terser-webpack-plugin.svg\n[node-url]: https://nodejs.org\n[deps]: https://david-dm.org/webpack-contrib/terser-webpack-plugin.svg\n[deps-url]: https://david-dm.org/webpack-contrib/terser-webpack-plugin\n[tests]: https://dev.azure.com/webpack-contrib/terser-webpack-plugin/_apis/build/status/webpack-contrib.terser-webpack-plugin?branchName=master\n[tests-url]: https://dev.azure.com/webpack-contrib/terser-webpack-plugin/_build/latest?definitionId=7&branchName=master\n[cover]: https://codecov.io/gh/webpack-contrib/terser-webpack-plugin/branch/master/graph/badge.svg\n[cover-url]: https://codecov.io/gh/webpack-contrib/terser-webpack-plugin\n[chat]: https://img.shields.io/badge/gitter-webpack%2Fwebpack-brightgreen.svg\n[chat-url]: https://gitter.im/webpack/webpack\n[size]: https://packagephobia.now.sh/badge?p=terser-webpack-plugin\n[size-url]: https://packagephobia.now.sh/result?p=terser-webpack-plugin\n","readmeFilename":"README.md"}