[![npm][npm]][npm-url] [![node][node]][node-url] [![tests][tests]][tests-url] [![coverage][cover]][cover-url] [![discussion][discussion]][discussion-url] [![size][size]][size-url] # source-map-loader Extracts source maps from existing source files (from their sourceMappingURL). ## Getting Started To begin, you'll need to install `source-map-loader`: ```console npm i -D source-map-loader ``` or ```console yarn add -D source-map-loader ``` or ```console pnpm add -D source-map-loader ``` Then add the plugin to your `webpack` config. For example: **file.js** ```js import css from "file.css"; ``` **webpack.config.js** ```js module.exports = { module: { rules: [ { test: /\.js$/, enforce: "pre", use: ["source-map-loader"], }, ], }, }; ``` The `source-map-loader` extracts existing source maps from all JavaScript entries. This includes both inline source maps as well as those linked via URL. All source map data is passed to webpack for processing as per a chosen [source map style](https://webpack.js.org/configuration/devtool/) specified by the `devtool` option in [webpack.config.js](https://webpack.js.org/configuration/). This loader is especially useful when using 3rd-party libraries having their own source maps. If not extracted and processed into the source map of the webpack bundle, browsers may misinterpret source map data. `source-map-loader` allows webpack to maintain source map data continuity across libraries so ease of debugging is preserved. The `source-map-loader` will extract from any JavaScript file, including those in the `node_modules` directory. Be mindful in setting [include](https://webpack.js.org/configuration/module/#rule-include) and [exclude](https://webpack.js.org/configuration/module/#rule-exclude) rule conditions to maximize bundling performance. And run `webpack` via your preferred method. ## Options | Name | Type | Default | Description | | :-----------------------------------------------------: | :----------: | :---------: | :--------------------------------------------- | | **[`filterSourceMappingUrl`](#filtersourcemappingurl)** | `{Function}` | `undefined` | Allows to control `SourceMappingURL` behaviour | ### filterSourceMappingUrl Type: `Function` Default: `undefined` Allows you to specify the behavior of the loader for `SourceMappingURL` comment. The function must return one of the values: - `true` or `'consume'` - consume the source map and remove `SourceMappingURL` comment (default behavior) - `false` or `'remove'` - do not consume the source map and remove `SourceMappingURL` comment - `skip` - do not consume the source map and do not remove `SourceMappingURL` comment Example configuration: **webpack.config.js** ```js module.exports = { module: { rules: [ { test: /\.js$/, enforce: "pre", use: [ { loader: "source-map-loader", options: { filterSourceMappingUrl: (url, resourcePath) => { if (/broker-source-map-url\.js$/i.test(url)) { return false; } if (/keep-source-mapping-url\.js$/i.test(resourcePath)) { return "skip"; } return true; }, }, }, ], }, ], }, }; ``` ## Examples ### Ignoring Warnings To ignore warnings, you can use the following configuration: **webpack.config.js** ```js module.exports = { module: { rules: [ { test: /\.js$/, enforce: "pre", use: ["source-map-loader"], }, ], }, ignoreWarnings: [/Failed to parse source map/], }; ``` More information about the `ignoreWarnings` option can be found [here](https://webpack.js.org/configuration/other-options/#ignorewarnings) ## 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/source-map-loader.svg [npm-url]: https://npmjs.com/package/source-map-loader [node]: https://img.shields.io/node/v/source-map-loader.svg [node-url]: https://nodejs.org [tests]: https://github.com/webpack-contrib/source-map-loader/workflows/source-map-loader/badge.svg [tests-url]: https://github.com/webpack-contrib/source-map-loader/actions [cover]: https://codecov.io/gh/webpack-contrib/source-map-loader/branch/master/graph/badge.svg [cover-url]: https://codecov.io/gh/webpack-contrib/source-map-loader [discussion]: https://img.shields.io/github/discussions/webpack/webpack [discussion-url]: https://github.com/webpack/webpack/discussions [size]: https://packagephobia.now.sh/badge?p=source-map-loader [size-url]: https://packagephobia.now.sh/result?p=source-map-loader

	Stars	Issues	Version	Updated	Created
@types/aws-lambda	47,164	677	8.10.137	24 days ago	8 years ago
awesome-typescript-loader	2,352	233	5.2.1	6 years ago	9 years ago
source-map-loader	355	5	5.0.0	3 months ago	10 years ago
ts-loader	3,425	79	9.5.1	5 months ago	9 years ago

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