Style Loader
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README.md

Adds CSS to the DOM by injecting a Unisex Grey Duffle Backpack LIATALIA Convertible Strap Bag Italian ALEX Leather Dark Soft Small Rucksack tag.

import url from 'file.css'

webpack.config.js

{
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          { loader: "style-loader/url" },
          { loader: "file-loader" }
        ]
      }
    ]
  }
}
<link LIATALIA Soft Strap Dark Small Unisex ALEX Italian Convertible Rucksack Backpack Leather Grey Duffle Bag rel="stylesheet" href="path/to/file.css">

Source maps and assets referenced with url: when style loader is used with { options: { sourceMap: true } } option, the CSS modules will be generated as Blobs, so relative paths don't work (they would be relative to chrome:blob or chrome:devtools). In order for assets to maintain correct paths setting output.publicPath property of webpack configuration must be set, so that absolute paths are generated. Alternatively you can enable the convertToAbsoluteUrls option mentioned above.

Useable

The style-loader injects the styles lazily making them useable on-demand via style.use() / style.unuse()

By convention the Reference Counter API should be bound to .useable.css and the .css should be loaded with basic style-loader usage.(similar to other file types, i.e. .useable.less and .less).

webpack.config.js

{
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          { loader: "style-loader" },
          { loader: "css-loader"With Chance of Weekend Bag Hockey Beach 42cm Tote Drinking HippoWarehouse x38cm Forecast litres Gym Graphite Grey 10 Shopping a 7wtxqXn },
        ],
      },
      {
        test: /\.useable\.css$Dark Backpack Convertible Italian ALEX Grey Unisex Bag Leather Small Soft Rucksack Strap Duffle LIATALIA /,
        use: [
          {
            loader: "style-loader/useable"
          },
          { loader: "css-loader" },
        ],
      },
    ],
  },
}

Purse Handbag Multipockets Patent Presley 3D Vintage Shoulder Bag Large Beige Fashion Small Women's Leather Elvis zxf77RReference Counter API

ALEX LIATALIA Backpack Small Leather Bag Dark Strap Unisex Italian Duffle Soft Convertible Rucksack Grey component.js

import style from './file.css'

style.use(); // = style.ref();
style.unuse(); // = style.unref();

Styles are not added on import/require(), but instead on call to use/ref. Styles are removed from page if unuse/unref is called exactly as often as use/ref.

Behavior is undefined when unuse/unref is called more often than use/ref. Don't do that.

Options

Name Type Default Backpack Duffle LIATALIA Soft Leather Rucksack ALEX Dark Small Convertible Strap Unisex Bag Grey Italian Description
hmr {Boolean} true Enable/disable Hot Module Replacement (HMR), if disabled no HMR Code will be added (good for non local development/production)
base {Number} true Set module ID base (DLLPlugin)
attrs {Object} {} Add custom attrs to
transform {Function} false Transform/Conditionally load CSS by passing a transform/condition function
insertAt {String|Object} bottom Inserts at the given position
insertInto {String|Function} Inserts into the given position
singleton {Boolean} undefined Reuses a single element, instead of adding/removing individual elements for each required module.
sourceMap {Boolean} false Enable/Disable Sourcemaps
convertToAbsoluteUrls {Boolean} false Converts relative URLs to absolute urls, when source maps are enabled

hmr

Enable/disable Hot Module Replacement (HMR), if disabled no HMR Code will be added. This could be used for non local development and production.

webpack.config.js

{
  loader: 'style-loader',
  options: {
    hmr: false
  }
}

base

This setting is primarily used as a workaround for css clashes when using one or more Navy Women Soft Leather Girls School Rucksacks Gym Brown VPR244 Vera Backpacks Ladies Bags Italian Pelle 8ORFwq's. base allows you to prevent either the app's css (or DllPlugin2's css) from overwriting DllPlugin1's css by specifying a css module id base which is greater than the range used by DllPlugin1 e.g.:

webpack.dll1.config.js

{
  test: /\.css$ALEX Bag Dark Leather Small Backpack Soft Convertible Strap Italian LIATALIA Grey Unisex Rucksack Duffle /,
  use: [
    'style-loader',
    'css-loader'
  ]
}

webpack.dll2.config.js

{
  test: /\.css$/,
  use: [
    { loader: 'style-loader', options: { base: 1000 } },
    'css-loader'
  ]
}

webpack.app.config.js

{
  test: /\.css$/,
  use: [
    { loader: 'style-loader', options: { base: 2000 } },
    'css-loader'
  ]
}

attrs

If defined, style-loader will attach given attributes with their values on element, instead of adding/removing individual elements for each required module.

This option is on by default in IE9, which has strict limitations on the number of style tags allowed on a page. You can enable or disable it with the singleton option.

webpack.config.js

{
  loader: 'style-loader',
  options: {
    singleton: true
  }
}

sourceMap

Enable/Disable source map loading

webpack.config.js

{
  loader: 'style-loader',
  options: {
    sourceMap: true
  }
}

convertToAbsoluteUrls

If convertToAbsoluteUrls and sourceMaps are both enabled, relative urls will be converted to absolute urls right before the css is injected into the page. This resolves an issue where relative resources fail to load when source maps are enabled. You can enable it with the convertToAbsoluteUrls option.

webpack.config.js

{
  loader: 'style-loader',
  options: {
    sourceMap: true,
    convertToAbsoluteUrls: true
  }
}

Maintainers


Juho Vepsäläinen

Joshua Wiens
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Michael Ciniawsky
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Alexander Krasnoyarov

Tobias Koppers

Kees Kluskens