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extract-text-webpack-plugin - npm

Extract Text Plugin

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

Install

npm install --save-dev extract-text-webpack-plugin

npm install --save-dev extract-text-webpack-plugin@2.1.2

npm install --save-dev extract-text-webpack-plugin@1.0.1

Usage

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

new ExtractTextPlugin(options: filename | object)

Name Type Description id {String} Unique ident for this plugin instance. (For advanced usage only, by default automatically generated) filename {String\|Function} Name of the result file. May contain [name], [id] and [contenthash] allChunks {Boolean} 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 disable {Boolean} Disables the plugin ignoreOrder {Boolean} Disables order check (useful for CSS Modules!), false by default

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

 

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',

          

          use: ['css-loader', 'sass-loader']

        })

      }

    ]

  },

  plugins: [

    new ExtractTextPlugin('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

  })

]

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