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https://github.com/danethurber/webpack-manifest-plugin

webpack plugin for generating asset manifests
https://github.com/danethurber/webpack-manifest-plugin

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webpack plugin for generating asset manifests

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	webpack-manfiest-plugin






[![tests][tests]][tests-url]

[![cover][cover]][cover-url]

[![size][size]][size-url]

[![libera manifesto](https://img.shields.io/badge/libera-manifesto-lightgrey.svg)](https://liberamanifesto.com)



# webpack-manifest-plugin



A Webpack plugin for generating an asset manifest.



:heart: Please consider [Sponsoring my work](https://github.com/sponsors/shellscape)



## Requirements



`webpack-manifest-plugin` is an [evergreen 🌲](./.github/FAQ.md#what-does-evergreen-mean) module.



This module requires an [Active LTS](https://github.com/nodejs/Release) Node version (v12.0.0+) and Webpack v5.0.0.



## Contributing



This repository leverages [pnpm](https://pnpm.js.org/) for dependency management.



To begin, please install `pnpm`:



```console

$ npm install pnpm -g

```



## Install



Using npm:



```console

npm install webpack-nano webpack-manifest-plugin --save-dev

```



_Note: We recommend using [webpack-nano](https://github.com/shellscape/webpack-nano), a very tiny, very clean webpack CLI._



## Usage



Create a `webpack.config.js` file:



```js

const { WebpackManifestPlugin } = require('webpack-manifest-plugin');

const options = { ... };



module.exports = {

	// an example entry definition

	entry: [ 'app.js'	],

  ...

  plugins: [

    new WebpackManifestPlugin(options)

  ]

};

```



And run `webpack`:



```console

$ npx wp

```



With the default options, the example above will create a `manifest.json` file in the output directory for the build. The manifest file will contain a map of source filenames to the corresponding build output file. e.g.



```json

{

  "dist/batman.js": "dist/batman.1234567890.js",

  "dist/joker.js": "dist/joker.0987654321.js"

}

```



### Options



### `assetHookStage`



Type: `Number`


Default: `Infinity`



If you need to consume the output of this plugin in another plugin, it can be useful to adjust the stage at which the manifest is generated. Pass a new stage to `assetHookStage` to change when the manifest is generated. See the [docs on `processAssets`](https://webpack.js.org/api/compilation-hooks/#list-of-asset-processing-stages) for more detail.



Note: any files added to the compilation after the stage specified will not be included in the manifest.



### `basePath`



Type: `String`


Default: `''`



Specifies a path prefix for all keys in the manifest. Useful for including your output path in the manifest.



### `fileName`



Type: `String`


Default: `manifest.json`



Specifies the file name to use for the resulting manifest. By default the plugin will emit `manifest.json` to your output directory. Passing an absolute path to the `fileName` option will override both the file name and path.



### `filter`



Type: `Function`


Default: `undefined`



Allows filtering the files which make up the manifest. The passed function should match the signature of `(file: FileDescriptor) => Boolean`. Return `true` to keep the file, `false` to remove the file.



### `generate`



Type: `Function`


Default: `undefined`



A custom `Function` to create the manifest. The passed function should match the signature of `(seed: Object, files: FileDescriptor[], entries: string[]) => Object` and can return anything as long as it's serialisable by `JSON.stringify`.



### `map`



Type: `Function`


Default: `undefined`



Allows modifying the files which make up the manifest. The passed function should match the signature of `(file: FileDescriptor) => FileDescriptor` where an object matching `FileDescriptor` is returned.



### `publicPath`



Type: `String`


Default: `.output.publicPath`



A path prefix that will be added to values of the manifest.



### `removeKeyHash`



Type: `RegExp | false`


Default: `/([a-f0-9]{32}\.?)/gi`



If set to a valid `RegExp`, removes hashes from manifest keys. e.g.



```json

{

  "index.c5a9bff71fdfed9b6046.html": "index.c5a9bff71fdfed9b6046.html"

}

```



```json

{

  "index.html": "index.c5a9bff71fdfed9b6046.html"

}

```



The default value for this option is a regular expression targeting Webpack's [default md5 hash](https://webpack.js.org/configuration/output/#outputhashfunction). To target other hashing functions / algorithms, set this option to an appropriate `RegExp`. To disable replacing the hashes in key names, set this option to `false`.



### `seed`



Type: `Object`


Default: `{}`



A cache of key/value pairs used to seed the manifest. This may include a set of [custom key/value](https://developer.mozilla.org/en-US/Add-ons/WebExtensions/manifest.json) pairs to include in your manifest, or may be used to combine manifests across compilations in [multi-compiler mode](https://github.com/webpack/webpack/tree/master/examples/multi-compiler). To combine manifests, pass a shared seed object to each compiler's `WebpackManifestPlugin` instance.



### `serialize`



Type: `Function(Object) => string`


Default: `undefined`



A `Function` which can be leveraged to serialize the manifest in a different format than json. e.g. `yaml`.



### `sort`



Type: `Function`


Default: `undefined`



Allows sorting the files which make up the manifest. The passed function should match the signature of `(fileA: FileDescriptor, fileB: FileDescriptor) => Number`. Return `0` to indicate no change, `-1` to indicate the file should be moved to a lower index, and `1` to indicate the file shoud be moved to a higher index.



### `useEntryKeys`



Type: `Boolean`


Default: `false`



If `true`, the keys specified in the `entry` property will be used as keys in the manifest. No file extension will be added (unless specified as part of an `entry` property key).



### `useLegacyEmit`



Type: `Boolean`


Default: `false`



If `true`, the manifest will be written on the deprecated webpack `emit` hook to be compatible with not yet updated webpack plugins.



A lot of webpack plugins are not yet updated to match the new webpack 5 API. This is a problem when other plugins use the deprecated `emit` hook. The manifest will be written before these other plugins and thus files are missing on the manifest.



### `writeToFileEmit`



Type: `Boolean`


Default: `false`



If `true`, will emit the manifest to the build directory _and_ in memory for compatibility with `webpack-dev-server`.



## Manifest File Descriptor



This plugin utilizes the following object structure to work with files. Many options for this plugin utilize the structure below.



```ts

{

  chunk?: Chunk;

  isAsset: boolean;

  isChunk: boolean;

  isInitial: boolean;

  isModuleAsset: boolean;

  name: string | null;

  path: string;

}

```



### `chunk`



Type: [`Chunk`](https://github.com/webpack/webpack/blob/master/lib/Chunk.js)



Only available if `isChunk` is `true`



### `isInitial`



Type: `Boolean`



Is required to run you app. Cannot be `true` if `isChunk` is `false`.



### `isModuleAsset`



Type: `Boolean`



Is required by a module. Cannot be `true` if `isAsset` is `false`.



## Compiler Hooks



This plugin supports the following hooks via the `getCompilerHooks` export; `afterEmit`, `beforeEmit`. These hooks can be useful, e.g. changing manifest contents before emitting to disk.



### `getCompilerHooks`



Returns: `{ afterEmit: SyncWaterfallHook, beforeEmit: SyncWaterfallHook }`



#### Usage



```js

const { getCompilerHooks } = require('webpack-manifest-plugin');



class BatmanPlugin {

  apply(compiler) {

    const { beforeEmit } = getCompilerHooks(compiler);



    beforeEmit.tap('BatmanPlugin', (manifest) => {

      return { ...manifest, name: 'hello' };

    });

  }

}

```



## Notes



- If using this plugin with `webpack-clean` and `webpack-dev-server`, please review [this issue](https://github.com/shellscape/webpack-manifest-plugin/issues/267).



## Attiribution



Special thanks to [Dane Thurber](https://github.com/danethurber), the original author of this plugin, without whom this plugin would not exist.



## Meta



[CONTRIBUTING](./.github/CONTRIBUTING.md)



[LICENSE (MIT)](./LICENSE)