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ExtractTextWebpackPlugin

Extract text from a bundle, or bundles, into a separate file.

Install


npm install --save-dev extract-text-webpack-plugin
# for webpack 2
npm install --save-dev extract-text-webpack-plugin@2.1.2
# for webpack 1
npm install --save-dev extract-text-webpack-plugin@1.0.1

Usage

:warning: For webpack v1, see the README in the webpack-1 branch.

const ExtractTextPlugin = require("extract-text-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          fallback: "style-loader",
          use: "css-loader"
        })
      }
    ]
  },
  plugins: [
    new ExtractTextPlugin("styles.css"),
  ]
}

It moves all the required *.css modules in entry chunks into a separate CSS file. So your styles are no longer inlined into the JS bundle, but in a separate CSS file (styles.css). If your total stylesheet volume is big, it will be faster because the CSS bundle is loaded in parallel to the JS bundle.

Advantages
Caveats
Advantages
Fewer style tags (older IE has a limit)
Caveats
Additional HTTP request
Advantages
CSS SourceMap (with devtool: "source-map" and extract-text-webpack-plugin?sourceMap)
Caveats
Longer compilation time
Advantages
CSS requested in parallel
Caveats
No runtime public path modification
Advantages
CSS cached separate
Caveats
No Hot Module Replacement
Advantages
Faster runtime (less code and DOM operations)
Caveats
...

Options

new ExtractTextPlugin(options: filename | object)
Name
Type
Description
Name
id
Type
{String}
Description
Unique ident for this plugin instance. (For advanced usage only, by default automatically generated)
Name
filename
Type
{String|Function}
Description
Name of the result file. May contain [name], [id] and [contenthash]
Name
allChunks
Type
{Boolean}
Description
Extract from all additional chunks too (by default it extracts only from the initial chunk(s))
When using CommonsChunkPlugin and there are extracted chunks (from ExtractTextPlugin.extract) in the commons chunk, allChunks must be set to true
Name
disable
Type
{Boolean}
Description
Disables the plugin
Name
ignoreOrder
Type
{Boolean}
Description
Disables order check (useful for CSS Modules!), false by default
  • [name] name of the chunk
  • [id] number of the chunk
  • [contenthash] hash of the content of the extracted file
  • [<hashType>:contenthash:<digestType>:<length>] optionally you can configure
    • other hashTypes, e.g. sha1, md5, sha256, sha512
    • other digestTypes, e.g. hex, base26, base32, base36, base49, base52, base58, base62, base64
    • and length, the length of the hash in chars

:warning: ExtractTextPlugin generates a file per entry, so you must use [name], [id] or [contenthash] when using multiple entries.

#extract

ExtractTextPlugin.extract(options: loader | object)

Creates an extracting loader from an existing loader. Supports loaders of type { loader: [name]-loader -> {String}, options: {} -> {Object} }.

Name
Type
Description
Name
options.use
Type
{String}/{Array}/{Object}
Description
Loader(s) that should be used for converting the resource to a CSS exporting module (required)
Name
options.fallback
Type
{String}/{Array}/{Object}
Description
loader(e.g 'style-loader') that should be used when the CSS is not extracted (i.e. in an additional chunk when allChunks: false)
Name
options.publicPath
Type
{String}
Description
Override the publicPath setting for this loader

Multiple Instances

There is also an extract function on the instance. You should use this if you have more than one instance of ExtractTextPlugin.

const ExtractTextPlugin = require('extract-text-webpack-plugin');

// Create multiple instances
const extractCSS = new ExtractTextPlugin('stylesheets/[name]-one.css');
const extractLESS = new ExtractTextPlugin('stylesheets/[name]-two.css');

module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: extractCSS.extract([ 'css-loader', 'postcss-loader' ])
      },
      {
        test: /\.less$/i,
        use: extractLESS.extract([ 'css-loader', 'less-loader' ])
      },
    ]
  },
  plugins: [
    extractCSS,
    extractLESS
  ]
};

Extracting Sass or LESS

The configuration is the same, switch out sass-loader for less-loader when necessary.

const ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.scss$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          //resolve-url-loader may be chained before sass-loader if necessary
          use: ['css-loader', 'sass-loader']
        })
      }
    ]
  },
  plugins: [
    new ExtractTextPlugin('style.css')
    //if you want to pass in options, you can do so:
    //new ExtractTextPlugin({
    //  filename: 'style.css'
    //})
  ]
}

Modify filename

filename parameter could be Function. It passes getPath to process the format like css/[name].css and returns the real file name, css/js/a.css. You can replace css/js with css then you will get the new path css/a.css.

entry: {
  'js/a': "./a"
},
plugins: [
  new ExtractTextPlugin({
    filename:  (getPath) => {
      return getPath('css/[name].css').replace('css/js', 'css');
    },
    allChunks: true
  })
]

Maintainers


Juho Vepsäläinen


Joshua Wiens


Kees Kluskens


Sean Larkin