935 lines
21 KiB
Markdown
935 lines
21 KiB
Markdown
<div align="center">
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<a href="https://github.com/webpack/webpack">
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<img width="200" height="200" src="https://webpack.js.org/assets/icon-square-big.svg">
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</a>
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</div>
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[![npm][npm]][npm-url]
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[![node][node]][node-url]
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[![tests][tests]][tests-url]
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[![cover][cover]][cover-url]
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[![discussion][discussion]][discussion-url]
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[![size][size]][size-url]
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# terser-webpack-plugin
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This plugin uses [terser](https://github.com/terser/terser) to minify/minimize your JavaScript.
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## Getting Started
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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.
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To begin, you'll need to install `terser-webpack-plugin`:
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```console
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npm install terser-webpack-plugin --save-dev
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```
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or
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```console
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yarn add -D terser-webpack-plugin
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```
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or
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```console
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pnpm add -D terser-webpack-plugin
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```
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Then add the plugin to your `webpack` config. For example:
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**webpack.config.js**
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```js
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const TerserPlugin = require("terser-webpack-plugin");
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [new TerserPlugin()],
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},
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};
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```
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And run `webpack` via your preferred method.
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## Note about source maps
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**Works only with `source-map`, `inline-source-map`, `hidden-source-map` and `nosources-source-map` values for the [`devtool`](https://webpack.js.org/configuration/devtool/) option.**
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Why?
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- `eval` wraps modules in `eval("string")` and the minimizer does not handle strings.
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- `cheap` has not column information and minimizer generate only a single line, which leave only a single mapping.
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Using supported `devtool` values enable source map generation.
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## Options
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- **[`test`](#test)**
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- **[`include`](#include)**
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- **[`exclude`](#exclude)**
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- **[`parallel`](#parallel)**
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- **[`minify`](#minify)**
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- **[`terserOptions`](#terseroptions)**
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- **[`extractComments`](#extractcomments)**
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### `test`
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Type:
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```ts
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type test = string | RegExp | Array<string | RegExp>;
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```
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Default: `/\.m?js(\?.*)?$/i`
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Test to match files against.
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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test: /\.js(\?.*)?$/i,
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}),
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],
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},
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};
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```
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### `include`
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Type:
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```ts
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type include = string | RegExp | Array<string | RegExp>;
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```
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Default: `undefined`
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Files to include.
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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include: /\/includes/,
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}),
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],
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},
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};
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```
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### `exclude`
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Type:
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```ts
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type exclude = string | RegExp | Array<string | RegExp>;
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```
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Default: `undefined`
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Files to exclude.
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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exclude: /\/excludes/,
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}),
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],
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},
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};
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```
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### `parallel`
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Type:
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```ts
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type parallel = boolean | number;
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```
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Default: `true`
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Use multi-process parallel running to improve the build speed.
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Default number of concurrent runs: `os.cpus().length - 1`.
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> **Note**
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>
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> Parallelization can speedup your build significantly and is therefore **highly recommended**.
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> **Warning**
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>
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> 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](https://github.com/webpack-contrib/terser-webpack-plugin/issues/143), [#202](https://github.com/webpack-contrib/terser-webpack-plugin/issues/202)).
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#### `boolean`
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Enable/disable multi-process parallel running.
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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parallel: true,
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}),
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],
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},
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};
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```
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#### `number`
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Enable multi-process parallel running and set number of concurrent runs.
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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parallel: 4,
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}),
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],
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},
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};
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```
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### `minify`
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Type:
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```ts
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type minify = (
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input: {
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[file: string]: string;
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},
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sourceMap: import("@jridgewell/trace-mapping").SourceMapInput | undefined,
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minifyOptions: {
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module?: boolean | undefined;
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ecma?: import("terser").ECMA | undefined;
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},
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extractComments:
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| boolean
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| "all"
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| "some"
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| RegExp
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| ((
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astNode: any,
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comment: {
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value: string;
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type: "comment1" | "comment2" | "comment3" | "comment4";
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pos: number;
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line: number;
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col: number;
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}
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) => boolean)
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| {
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condition?:
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| boolean
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| "all"
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| "some"
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| RegExp
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| ((
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astNode: any,
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comment: {
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value: string;
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type: "comment1" | "comment2" | "comment3" | "comment4";
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pos: number;
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line: number;
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col: number;
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}
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) => boolean)
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| undefined;
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filename?: string | ((fileData: any) => string) | undefined;
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banner?:
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| string
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| boolean
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| ((commentsFile: string) => string)
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| undefined;
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}
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| undefined
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) => Promise<{
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code: string;
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map?: import("@jridgewell/trace-mapping").SourceMapInput | undefined;
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errors?: (string | Error)[] | undefined;
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warnings?: (string | Error)[] | undefined;
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extractedComments?: string[] | undefined;
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}>;
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```
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Default: `TerserPlugin.terserMinify`
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Allows you to override default minify function.
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By default plugin uses [terser](https://github.com/terser/terser) package.
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Useful for using and testing unpublished versions or forks.
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> **Warning**
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>
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> **Always use `require` inside `minify` function when `parallel` option enabled**.
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**webpack.config.js**
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```js
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// Can be async
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const minify = (input, sourceMap, minimizerOptions, extractsComments) => {
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// The `minimizerOptions` option contains option from the `terserOptions` option
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// You can use `minimizerOptions.myCustomOption`
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// Custom logic for extract comments
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const { map, code } = require("uglify-module") // Or require('./path/to/uglify-module')
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.minify(input, {
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/* Your options for minification */
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});
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return { map, code, warnings: [], errors: [], extractedComments: [] };
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};
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// Used to regenerate `fullhash`/`chunkhash` between different implementation
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// 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
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// to avoid this you can provide version of your custom minimizer
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// You don't need if you use only `contenthash`
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minify.getMinimizerVersion = () => {
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let packageJson;
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try {
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// eslint-disable-next-line global-require, import/no-extraneous-dependencies
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packageJson = require("uglify-module/package.json");
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} catch (error) {
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// Ignore
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}
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return packageJson && packageJson.version;
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};
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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terserOptions: {
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myCustomOption: true,
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},
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minify,
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}),
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],
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},
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};
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```
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### `terserOptions`
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Type:
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```ts
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type terserOptions = {
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compress?: boolean | CompressOptions;
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ecma?: ECMA;
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enclose?: boolean | string;
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ie8?: boolean;
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keep_classnames?: boolean | RegExp;
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keep_fnames?: boolean | RegExp;
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mangle?: boolean | MangleOptions;
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module?: boolean;
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nameCache?: object;
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format?: FormatOptions;
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/** @deprecated */
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output?: FormatOptions;
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parse?: ParseOptions;
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safari10?: boolean;
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sourceMap?: boolean | SourceMapOptions;
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toplevel?: boolean;
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};
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```
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Default: [default](https://github.com/terser/terser#minify-options)
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Terser [options](https://github.com/terser/terser#minify-options).
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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terserOptions: {
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ecma: undefined,
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parse: {},
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compress: {},
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mangle: true, // Note `mangle.properties` is `false` by default.
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module: false,
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// Deprecated
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output: null,
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format: null,
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toplevel: false,
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nameCache: null,
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ie8: false,
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keep_classnames: undefined,
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keep_fnames: false,
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safari10: false,
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},
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}),
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],
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},
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};
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```
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### `extractComments`
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Type:
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```ts
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type extractComments =
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| boolean
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| string
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| RegExp
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| ((
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astNode: any,
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comment: {
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value: string;
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type: "comment1" | "comment2" | "comment3" | "comment4";
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pos: number;
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line: number;
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col: number;
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}
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) => boolean)
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| {
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condition?:
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| boolean
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| "all"
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| "some"
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| RegExp
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| ((
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astNode: any,
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comment: {
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value: string;
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type: "comment1" | "comment2" | "comment3" | "comment4";
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pos: number;
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line: number;
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col: number;
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}
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) => boolean)
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| undefined;
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filename?: string | ((fileData: any) => string) | undefined;
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banner?:
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| string
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| boolean
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| ((commentsFile: string) => string)
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| undefined;
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};
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```
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Default: `true`
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Whether comments shall be extracted to a separate file, (see [details](https://github.com/webpack/webpack/commit/71933e979e51c533b432658d5e37917f9e71595a)).
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By default extract only comments using `/^\**!|@preserve|@license|@cc_on/i` regexp condition and remove remaining comments.
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If the original file is named `foo.js`, then the comments will be stored to `foo.js.LICENSE.txt`.
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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.
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#### `boolean`
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Enable/disable extracting comments.
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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extractComments: true,
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}),
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],
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},
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};
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```
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#### `string`
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Extract `all` or `some` (use `/^\**!|@preserve|@license|@cc_on/i` RegExp) comments.
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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extractComments: "all",
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}),
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],
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},
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};
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```
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#### `RegExp`
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All comments that match the given expression will be extracted to the separate file.
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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extractComments: /@extract/i,
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}),
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],
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},
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};
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```
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#### `function`
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All comments that match the given expression will be extracted to the separate file.
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**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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extractComments: (astNode, comment) => {
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if (/@extract/i.test(comment.value)) {
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return true;
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}
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return false;
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},
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}),
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],
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},
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};
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```
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#### `object`
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Allow to customize condition for extract comments, specify extracted file name and banner.
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|
**webpack.config.js**
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```js
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module.exports = {
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
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extractComments: {
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condition: /^\**!|@preserve|@license|@cc_on/i,
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filename: (fileData) => {
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// The "fileData" argument contains object with "filename", "basename", "query" and "hash"
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return `${fileData.filename}.LICENSE.txt${fileData.query}`;
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},
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banner: (licenseFile) => {
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return `License information can be found in ${licenseFile}`;
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},
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},
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}),
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],
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},
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};
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```
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##### `condition`
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|
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Type:
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|
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```ts
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type condition =
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| boolean
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| "all"
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| "some"
|
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| RegExp
|
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| ((
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astNode: any,
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comment: {
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value: string;
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type: "comment1" | "comment2" | "comment3" | "comment4";
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pos: number;
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line: number;
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col: number;
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}
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) => boolean)
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| undefined;
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```
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|
|
Condition what comments you need extract.
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|
|
**webpack.config.js**
|
|
|
|
```js
|
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module.exports = {
|
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optimization: {
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minimize: true,
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minimizer: [
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new TerserPlugin({
|
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extractComments: {
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condition: "some",
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filename: (fileData) => {
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// The "fileData" argument contains object with "filename", "basename", "query" and "hash"
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return `${fileData.filename}.LICENSE.txt${fileData.query}`;
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},
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banner: (licenseFile) => {
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return `License information can be found in ${licenseFile}`;
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},
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},
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}),
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],
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},
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};
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```
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|
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##### `filename`
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|
|
Type:
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|
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```ts
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type filename = string | ((fileData: any) => string) | undefined;
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```
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|
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Default: `[file].LICENSE.txt[query]`
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|
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Available placeholders: `[file]`, `[query]` and `[filebase]` (`[base]` for webpack 5).
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The file where the extracted comments will be stored.
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Default is to append the suffix `.LICENSE.txt` to the original filename.
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|
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> **Warning**
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>
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> We highly recommend using the `txt` extension. Using `js`/`cjs`/`mjs` extensions may conflict with existing assets which leads to broken code.
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|
|
|
**webpack.config.js**
|
|
|
|
```js
|
|
module.exports = {
|
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optimization: {
|
|
minimize: true,
|
|
minimizer: [
|
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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:
|
|
|
|
```ts
|
|
type banner = string | boolean | ((commentsFile: string) => string) | undefined;
|
|
```
|
|
|
|
Default: `/*! For license information please see ${commentsFile} */`
|
|
|
|
The banner text that points to the extracted file and will be added on top of the original file.
|
|
Can be `false` (no banner), a `String`, or a `Function<(string) -> String>` that will be called with the filename where extracted comments have been stored.
|
|
Will be wrapped into comment.
|
|
|
|
**webpack.config.js**
|
|
|
|
```js
|
|
module.exports = {
|
|
optimization: {
|
|
minimize: true,
|
|
minimizer: [
|
|
new TerserPlugin({
|
|
extractComments: {
|
|
condition: true,
|
|
filename: (fileData) => {
|
|
// The "fileData" argument contains object with "filename", "basename", "query" and "hash"
|
|
return `${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**
|
|
|
|
```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**
|
|
|
|
```js
|
|
module.exports = {
|
|
optimization: {
|
|
minimize: true,
|
|
minimizer: [
|
|
new TerserPlugin({
|
|
terserOptions: {
|
|
format: {
|
|
comments: false,
|
|
},
|
|
},
|
|
extractComments: false,
|
|
}),
|
|
],
|
|
},
|
|
};
|
|
```
|
|
|
|
### [`uglify-js`](https://github.com/mishoo/UglifyJS)
|
|
|
|
[`UglifyJS`](https://github.com/mishoo/UglifyJS) is a JavaScript parser, minifier, compressor and beautifier toolkit.
|
|
|
|
**webpack.config.js**
|
|
|
|
```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`](https://github.com/swc-project/swc)
|
|
|
|
[`swc`](https://github.com/swc-project/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**
|
|
|
|
```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`](https://github.com/evanw/esbuild)
|
|
|
|
[`esbuild`](https://github.com/evanw/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**
|
|
|
|
```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**
|
|
|
|
```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:
|
|
|
|
```ts
|
|
module.exports = {
|
|
optimization: {
|
|
minimize: true,
|
|
minimizer: [
|
|
new TerserPlugin({
|
|
terserOptions: {
|
|
compress: true,
|
|
},
|
|
}),
|
|
],
|
|
},
|
|
};
|
|
```
|
|
|
|
With built-in minify functions:
|
|
|
|
```ts
|
|
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](./.github/CONTRIBUTING.md)
|
|
|
|
## License
|
|
|
|
[MIT](./LICENSE)
|
|
|
|
[npm]: https://img.shields.io/npm/v/terser-webpack-plugin.svg
|
|
[npm-url]: https://npmjs.com/package/terser-webpack-plugin
|
|
[node]: https://img.shields.io/node/v/terser-webpack-plugin.svg
|
|
[node-url]: https://nodejs.org
|
|
[tests]: https://github.com/webpack-contrib/terser-webpack-plugin/workflows/terser-webpack-plugin/badge.svg
|
|
[tests-url]: https://github.com/webpack-contrib/terser-webpack-plugin/actions
|
|
[cover]: https://codecov.io/gh/webpack-contrib/terser-webpack-plugin/branch/master/graph/badge.svg
|
|
[cover-url]: https://codecov.io/gh/webpack-contrib/terser-webpack-plugin
|
|
[discussion]: https://img.shields.io/github/discussions/webpack/webpack
|
|
[discussion-url]: https://github.com/webpack/webpack/discussions
|
|
[size]: https://packagephobia.now.sh/badge?p=terser-webpack-plugin
|
|
[size-url]: https://packagephobia.now.sh/result?p=terser-webpack-plugin
|