mini-css-extract-plugin

This plugin extracts CSS into separate files. It creates a CSS file per JS file which contains CSS. It supports On-Demand-Loading of CSS and SourceMaps.

It builds on top of a new webpack v5 feature and requires webpack 5 to work.

Compared to the extract-text-webpack-plugin:

• Async loading
• No duplicate compilation (performance)
• Easier to use
• Specific to CSS

Getting Started

To begin, you'll need to install mini-css-extract-plugin:

1npm install --save-dev mini-css-extract-plugin

or

1yarn add -D mini-css-extract-plugin

or

1pnpm add -D mini-css-extract-plugin

It's recommended to combine mini-css-extract-plugin with the css-loader

Then add the loader and the plugin to your webpack config. For example:

style.css

1body {
2  background: green;
3}

component.js

1import "./style.css";

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [new MiniCssExtractPlugin()],
5  module: {
6    rules: [
7      {
8        test: /\.css$/i,
9        use: [MiniCssExtractPlugin.loader, "css-loader"],
10      },
11    ],
12  },
13};

[!WARNING]

Note that if you import CSS from your webpack entrypoint or import styles in the initial chunk, mini-css-extract-plugin will not load this CSS into the page. Please use html-webpack-plugin for automatic generation link tags or create index.html file with link tag.

[!WARNING]

Source maps works only for source-map/nosources-source-map/hidden-nosources-source-map/hidden-source-map values because CSS only supports source maps with the sourceMappingURL comment (i.e. //# sourceMappingURL=style.css.map). If you need set devtool to another value you can enable source maps generation for extracted CSS using sourceMap: true for css-loader.

Options

Plugin Options

• filename
• chunkFilename
• ignoreOrder
• insert
• attributes
• linkType
• runtime
• experimentalUseImportModule

filename

Type:

1type filename =
2  | string
3  | ((pathData: PathData, assetInfo?: AssetInfo) => string);

Default: [name].css

This option determines the name of each output CSS file.

Works like output.filename

chunkFilename

Type:

1type chunkFilename =
2  | string
3  | ((pathData: PathData, assetInfo?: AssetInfo) => string);

Default: based on filename

Specifying chunkFilename as a function is only available in webpack@5

This option determines the name of non-entry chunk files.

Works like output.chunkFilename

ignoreOrder

Type:

1type ignoreOrder = boolean;

Default: false

Remove Order Warnings. See examples below for details.

insert

Type:

1type insert = string | ((linkTag: HTMLLinkElement) => void);

Default: document.head.appendChild(linkTag);

Inserts the link tag at the given position for non-initial (async) CSS chunks

[!WARNING]

Only for non-initial (async) chunks.

By default, the mini-css-extract-plugin appends styles (<link> elements) to document.head of the current window.

However in some circumstances it might be necessary to have finer control over the append target or even delay link elements insertion. For example this is the case when you asynchronously load styles for an application that runs inside of an iframe. In such cases insert can be configured to be a function or a custom selector.

If you target an iframe make sure that the parent document has sufficient access rights to reach into the frame document and append elements to it.

string

Allows to setup custom query selector. A new <link> element will be inserted after the found item.

webpack.config.js

1new MiniCssExtractPlugin({
2  insert: "#some-element",
3});

A new <link> element will be inserted after the element with id some-element.

function

Allows to override default behavior and insert styles at any position.

⚠ Do not forget that this code will run in the browser alongside your application. Since not all browsers support latest ECMA features like let, const, arrow function expression and etc we recommend you to use only ECMA 5 features and syntax.

⚠ The insert function is serialized to string and passed to the plugin. This means that it won't have access to the scope of the webpack configuration module.

webpack.config.js

1new MiniCssExtractPlugin({
2  insert: function (linkTag) {
3    var reference = document.querySelector("#some-element");
4    if (reference) {
5      reference.parentNode.insertBefore(linkTag, reference);
6    }
7  },
8});

A new <link> element will be inserted before the element with id some-element.

attributes

Type:

1type attributes = Record<string, string>};

Default: {}

[!WARNING]

Only for non-initial (async) chunks.

If defined, the mini-css-extract-plugin will attach given attributes with their values on <link> element.

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      attributes: {
7        id: "target",
8        "data-target": "example",
9      },
10    }),
11  ],
12  module: {
13    rules: [
14      {
15        test: /\.css$/i,
16        use: [MiniCssExtractPlugin.loader, "css-loader"],
17      },
18    ],
19  },
20};

[!NOTE]

It's only applied to dynamically loaded css chunks, if you want to modify link attributes inside html file, please using html-webpack-plugin

linkType

Type:

1type linkType = string | boolean;

Default: text/css

This option allows loading asynchronous chunks with a custom link type, such as <link type="text/css" ...>.

string

Possible values: text/css

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      linkType: "text/css",
7    }),
8  ],
9  module: {
10    rules: [
11      {
12        test: /\.css$/i,
13        use: [MiniCssExtractPlugin.loader, "css-loader"],
14      },
15    ],
16  },
17};

boolean

false disables the link type attribute

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      linkType: false,
7    }),
8  ],
9  module: {
10    rules: [
11      {
12        test: /\.css$/i,
13        use: [MiniCssExtractPlugin.loader, "css-loader"],
14      },
15    ],
16  },
17};

runtime

Type:

1type runtime = boolean;

Default: true

Allows to enable/disable the runtime generation. CSS will be still extracted and can be used for a custom loading methods. For example, you can use assets-webpack-plugin to retrieve them then use your own runtime code to download assets when needed.

false to skip.

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      runtime: false,
7    }),
8  ],
9  module: {
10    rules: [
11      {
12        test: /\.css$/i,
13        use: [MiniCssExtractPlugin.loader, "css-loader"],
14      },
15    ],
16  },
17};

experimentalUseImportModule

Type:

1type experimentalUseImportModule = boolean;

Default: undefined

Enabled by default if not explicitly enabled (i.e. true and false allow you to explicitly control this option) and new API is available (at least webpack 5.52.0 is required). Boolean values are available since version 5.33.2, but you need to enable experiments.executeModule (not required from webpack 5.52.0).

Use a new webpack API to execute modules instead of child compilers. This improves performance and memory usage a lot.

When combined with experiments.layers, this adds a layer option to the loader options to specify the layer of the css execution.

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      // You don't need this for `>= 5.52.0` due to the fact that this is enabled by default
7      // Required only for `>= 5.33.2 & <= 5.52.0`
8      // Not available/unsafe for `<= 5.33.2`
9      experimentalUseImportModule: true,
10    }),
11  ],
12  module: {
13    rules: [
14      {
15        test: /\.css$/i,
16        use: [MiniCssExtractPlugin.loader, "css-loader"],
17      },
18    ],
19  },
20};

Loader Options

• publicPath
• emit
• esModule
• defaultExport

publicPath

Type:

1type publicPath =
2  | string
3  | ((resourcePath: string, rootContext: string) => string);

Default: the publicPath in webpackOptions.output

Specifies a custom public path for the external resources like images, files, etc inside CSS. Works like output.publicPath

string

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      // Options similar to the same options in webpackOptions.output
7      // both options are optional
8      filename: "[name].css",
9      chunkFilename: "[id].css",
10    }),
11  ],
12  module: {
13    rules: [
14      {
15        test: /\.css$/,
16        use: [
17          {
18            loader: MiniCssExtractPlugin.loader,
19            options: {
20              publicPath: "/public/path/to/",
21            },
22          },
23          "css-loader",
24        ],
25      },
26    ],
27  },
28};

function

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      // Options similar to the same options in webpackOptions.output
7      // both options are optional
8      filename: "[name].css",
9      chunkFilename: "[id].css",
10    }),
11  ],
12  module: {
13    rules: [
14      {
15        test: /\.css$/,
16        use: [
17          {
18            loader: MiniCssExtractPlugin.loader,
19            options: {
20              publicPath: (resourcePath, context) => {
21                return path.relative(path.dirname(resourcePath), context) + "/";
22              },
23            },
24          },
25          "css-loader",
26        ],
27      },
28    ],
29  },
30};

emit

Type:

1type emit = boolean;

Default: true

If true, emits a file (writes a file to the filesystem). If false, the plugin will extract the CSS but will not emit the file. It is often useful to disable this option for server-side packages.

esModule

Type:

1type esModule = boolean;

Default: true

By default, mini-css-extract-plugin generates JS modules that use the ES modules syntax. There are some cases in which using ES modules is beneficial, like in the case of module concatenation and tree shaking.

You can enable a CommonJS syntax using:

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [new MiniCssExtractPlugin()],
5  module: {
6    rules: [
7      {
8        test: /\.css$/i,
9        use: [
10          {
11            loader: MiniCssExtractPlugin.loader,
12            options: {
13              esModule: false,
14            },
15          },
16          "css-loader",
17        ],
18      },
19    ],
20  },
21};

defaultExport

Type:

1type defaultExport = boolean;

Default: false

[!NOTE]

This option will work only when you set namedExport to true in css-loader

By default, mini-css-extract-plugin generates JS modules based on the esModule and namedExport options in css-loader. Using the esModule and namedExport options will allow you to better optimize your code. If you set esModule: true and namedExport: true for css-loader mini-css-extract-plugin will generate only a named export. Our official recommendation is to use only named export for better future compatibility. But for some applications, it is not easy to quickly rewrite the code from the default export to a named export.

In case you need both default and named exports, you can enable this option:

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [new MiniCssExtractPlugin()],
5  module: {
6    rules: [
7      {
8        test: /\.css$/i,
9        use: [
10          {
11            loader: MiniCssExtractPlugin.loader,
12            options: {
13              defaultExport: true,
14            },
15          },
16          {
17            loader: "css-loader",
18            options: {
19              esModule: true,
20              modules: {
21                namedExport: true,
22              },
23            },
24          },
25        ],
26      },
27    ],
28  },
29};

Examples

Recommended

For production builds it's recommended to extract the CSS from your bundle being able to use parallel loading of CSS/JS resources later on. This can be achieved by using the mini-css-extract-plugin, because it creates separate css files. For development mode (including webpack-dev-server) you can use style-loader, because it injects CSS into the DOM using multiple and works faster.

Do not use style-loader and mini-css-extract-plugin together.

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2const devMode = process.env.NODE_ENV !== "production";
3
4module.exports = {
5  module: {
6    rules: [
7      {
8        // If you enable `experiments.css` or `experiments.futureDefaults`, please uncomment line below
9        // type: "javascript/auto",
10        test: /\.(sa|sc|c)ss$/,
11        use: [
12          devMode ? "style-loader" : MiniCssExtractPlugin.loader,
13          "css-loader",
14          "postcss-loader",
15          "sass-loader",
16        ],
17      },
18    ],
19  },
20  plugins: [].concat(devMode ? [] : [new MiniCssExtractPlugin()]),
21};

Minimal example

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      // Options similar to the same options in webpackOptions.output
7      // all options are optional
8      filename: "[name].css",
9      chunkFilename: "[id].css",
10      ignoreOrder: false, // Enable to remove warnings about conflicting order
11    }),
12  ],
13  module: {
14    rules: [
15      {
16        test: /\.css$/,
17        use: [
18          {
19            loader: MiniCssExtractPlugin.loader,
20            options: {
21              // you can specify a publicPath here
22              // by default it uses publicPath in webpackOptions.output
23              publicPath: "../",
24            },
25          },
26          "css-loader",
27        ],
28      },
29    ],
30  },
31};

Named export for CSS Modules

⚠ Names of locals are converted to camelCase.

⚠ It is not allowed to use JavaScript reserved words in css class names.

⚠ Options esModule and modules.namedExport in css-loader should be enabled.

styles.css

1.foo-baz {
2  color: red;
3}
4.bar {
5  color: blue;
6}

index.js

1import { fooBaz, bar } from "./styles.css";
2
3console.log(fooBaz, bar);

You can enable a ES module named export using:

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [new MiniCssExtractPlugin()],
5  module: {
6    rules: [
7      {
8        test: /\.css$/,
9        use: [
10          {
11            loader: MiniCssExtractPlugin.loader,
12          },
13          {
14            loader: "css-loader",
15            options: {
16              esModule: true,
17              modules: {
18                namedExport: true,
19                localIdentName: "foo__[name]__[local]",
20              },
21            },
22          },
23        ],
24      },
25    ],
26  },
27};

The publicPath option as function

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      // Options similar to the same options in webpackOptions.output
7      // both options are optional
8      filename: "[name].css",
9      chunkFilename: "[id].css",
10    }),
11  ],
12  module: {
13    rules: [
14      {
15        test: /\.css$/,
16        use: [
17          {
18            loader: MiniCssExtractPlugin.loader,
19            options: {
20              publicPath: (resourcePath, context) => {
21                // publicPath is the relative path of the resource to the context
22                // e.g. for ./css/admin/main.css the publicPath will be ../../
23                // while for ./css/main.css the publicPath will be ../
24                return path.relative(path.dirname(resourcePath), context) + "/";
25              },
26            },
27          },
28          "css-loader",
29        ],
30      },
31    ],
32  },
33};

Advanced configuration example

This plugin should not be used with style-loader in the loaders chain.

Here is an example to have both HMR in development and your styles extracted in a file for production builds.

(Loaders options left out for clarity, adapt accordingly to your needs.)

You should not use HotModuleReplacementPlugin plugin if you are using a webpack-dev-server. webpack-dev-server enables / disables HMR using hot option.

webpack.config.js

1const webpack = require("webpack");
2const MiniCssExtractPlugin = require("mini-css-extract-plugin");
3const devMode = process.env.NODE_ENV !== "production";
4
5const plugins = [
6  new MiniCssExtractPlugin({
7    // Options similar to the same options in webpackOptions.output
8    // both options are optional
9    filename: devMode ? "[name].css" : "[name].[contenthash].css",
10    chunkFilename: devMode ? "[id].css" : "[id].[contenthash].css",
11  }),
12];
13if (devMode) {
14  // only enable hot in development
15  plugins.push(new webpack.HotModuleReplacementPlugin());
16}
17
18module.exports = {
19  plugins,
20  module: {
21    rules: [
22      {
23        test: /\.(sa|sc|c)ss$/,
24        use: [
25          MiniCssExtractPlugin.loader,
26          "css-loader",
27          "postcss-loader",
28          "sass-loader",
29        ],
30      },
31    ],
32  },
33};

Hot Module Reloading (HMR)

[!NOTE]

HMR is automatically supported in webpack 5. No need to configure it. Skip the following:

The mini-css-extract-plugin supports hot reloading of actual css files in development. Some options are provided to enable HMR of both standard stylesheets and locally scoped CSS or CSS modules. Below is an example configuration of mini-css for HMR use with CSS modules.

You should not use HotModuleReplacementPlugin plugin if you are using a webpack-dev-server. webpack-dev-server enables / disables HMR using hot option.

webpack.config.js

1const webpack = require("webpack");
2const MiniCssExtractPlugin = require("mini-css-extract-plugin");
3
4const plugins = [
5  new MiniCssExtractPlugin({
6    // Options similar to the same options in webpackOptions.output
7    // both options are optional
8    filename: devMode ? "[name].css" : "[name].[contenthash].css",
9    chunkFilename: devMode ? "[id].css" : "[id].[contenthash].css",
10  }),
11];
12if (devMode) {
13  // only enable hot in development
14  plugins.push(new webpack.HotModuleReplacementPlugin());
15}
16
17module.exports = {
18  plugins,
19  module: {
20    rules: [
21      {
22        test: /\.css$/,
23        use: [
24          {
25            loader: MiniCssExtractPlugin.loader,
26            options: {},
27          },
28          "css-loader",
29        ],
30      },
31    ],
32  },
33};

Minimizing For Production

To minify the output, use a plugin like css-minimizer-webpack-plugin.

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2const CssMinimizerPlugin = require("css-minimizer-webpack-plugin");
3
4module.exports = {
5  plugins: [
6    new MiniCssExtractPlugin({
7      filename: "[name].css",
8      chunkFilename: "[id].css",
9    }),
10  ],
11  module: {
12    rules: [
13      {
14        test: /\.css$/,
15        use: [MiniCssExtractPlugin.loader, "css-loader"],
16      },
17    ],
18  },
19  optimization: {
20    minimizer: [
21      // For webpack@5 you can use the `...` syntax to extend existing minimizers (i.e. `terser-webpack-plugin`), uncomment the next line
22      // `...`,
23      new CssMinimizerPlugin(),
24    ],
25  },
26};

This will enable CSS optimization only in production mode. If you want to run it also in development set the optimization.minimize option to true.

Using preloaded or inlined CSS

The runtime code detects already added CSS via <link> or <style> tag. This can be useful when injecting CSS on server-side for Server-Side-Rendering. The href of the <link> tag has to match the URL that will be used for loading the CSS chunk. The data-href attribute can be used for <link> and <style> too. When inlining CSS data-href must be used.

Extracting all CSS in a single file

The CSS can be extracted in one CSS file using optimization.splitChunks.cacheGroups.

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  optimization: {
5    splitChunks: {
6      cacheGroups: {
7        styles: {
8          name: "styles",
9          type: "css/mini-extract",
10          chunks: "all",
11          enforce: true,
12        },
13      },
14    },
15  },
16  plugins: [
17    new MiniCssExtractPlugin({
18      filename: "[name].css",
19    }),
20  ],
21  module: {
22    rules: [
23      {
24        test: /\.css$/,
25        use: [MiniCssExtractPlugin.loader, "css-loader"],
26      },
27    ],
28  },
29};

Note that type should be used instead of test in Webpack 5, or else an extra .js file can be generated besides the .css file. This is because test doesn't know which modules should be dropped (in this case, it won't detect that .js should be dropped).

Extracting CSS based on entry

You may also extract the CSS based on the webpack entry name. This is especially useful if you import routes dynamically but want to keep your CSS bundled according to entry. This also prevents the CSS duplication issue one had with the ExtractTextPlugin.

1const path = require("path");
2const MiniCssExtractPlugin = require("mini-css-extract-plugin");
3
4module.exports = {
5  entry: {
6    foo: path.resolve(__dirname, "src/foo"),
7    bar: path.resolve(__dirname, "src/bar"),
8  },
9  optimization: {
10    splitChunks: {
11      cacheGroups: {
12        fooStyles: {
13          type: "css/mini-extract",
14          name: "styles_foo",
15          chunks: (chunk) => {
16            return chunk.name === "foo";
17          },
18          enforce: true,
19        },
20        barStyles: {
21          type: "css/mini-extract",
22          name: "styles_bar",
23          chunks: (chunk) => {
24            return chunk.name === "bar";
25          },
26          enforce: true,
27        },
28      },
29    },
30  },
31  plugins: [
32    new MiniCssExtractPlugin({
33      filename: "[name].css",
34    }),
35  ],
36  module: {
37    rules: [
38      {
39        test: /\.css$/,
40        use: [MiniCssExtractPlugin.loader, "css-loader"],
41      },
42    ],
43  },
44};

Filename Option as function

With the filename option you can use chunk data to customize the filename. This is particularly useful when dealing with multiple entry points and wanting to get more control out of the filename for a given entry point/chunk. In the example below, we'll use filename to output the generated css into a different directory.

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      filename: ({ chunk }) => `${chunk.name.replace("/js/", "/css/")}.css`,
7    }),
8  ],
9  module: {
10    rules: [
11      {
12        test: /\.css$/,
13        use: [MiniCssExtractPlugin.loader, "css-loader"],
14      },
15    ],
16  },
17};

Long Term Caching

For long term caching use filename: "[contenthash].css". Optionally add [name].

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      filename: "[name].[contenthash].css",
7      chunkFilename: "[id].[contenthash].css",
8    }),
9  ],
10  module: {
11    rules: [
12      {
13        test: /\.css$/,
14        use: [MiniCssExtractPlugin.loader, "css-loader"],
15      },
16    ],
17  },
18};

Remove Order Warnings

For projects where css ordering has been mitigated through consistent use of scoping or naming conventions, such as CSS Modules, the css order warnings can be disabled by setting the ignoreOrder flag to true for the plugin.

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  plugins: [
5    new MiniCssExtractPlugin({
6      ignoreOrder: true,
7    }),
8  ],
9  module: {
10    rules: [
11      {
12        test: /\.css$/i,
13        use: [MiniCssExtractPlugin.loader, "css-loader"],
14      },
15    ],
16  },
17};

Multiple Themes

webpack.config.js

1const MiniCssExtractPlugin = require("mini-css-extract-plugin");
2
3module.exports = {
4  entry: "./src/index.js",
5  module: {
6    rules: [
7      {
8        test: /\.s[ac]ss$/i,
9        oneOf: [
10          {
11            resourceQuery: "?dark",
12            use: [
13              MiniCssExtractPlugin.loader,
14              "css-loader",
15              {
16                loader: "sass-loader",
17                options: {
18                  additionalData: `@use 'dark-theme/vars' as vars;`,
19                },
20              },
21            ],
22          },
23          {
24            use: [
25              MiniCssExtractPlugin.loader,
26              "css-loader",
27              {
28                loader: "sass-loader",
29                options: {
30                  additionalData: `@use 'light-theme/vars' as vars;`,
31                },
32              },
33            ],
34          },
35        ],
36      },
37    ],
38  },
39  plugins: [
40    new MiniCssExtractPlugin({
41      filename: "[name].css",
42      attributes: {
43        id: "theme",
44      },
45    }),
46  ],
47};

src/index.js

1import "./style.scss";
2
3let theme = "light";
4const themes = {};
5
6themes[theme] = document.querySelector("#theme");
7
8async function loadTheme(newTheme) {
9  // eslint-disable-next-line no-console
10  console.log(`CHANGE THEME - ${newTheme}`);
11
12  const themeElement = document.querySelector("#theme");
13
14  if (themeElement) {
15    themeElement.remove();
16  }
17
18  if (themes[newTheme]) {
19    // eslint-disable-next-line no-console
20    console.log(`THEME ALREADY LOADED - ${newTheme}`);
21
22    document.head.appendChild(themes[newTheme]);
23
24    return;
25  }
26
27  if (newTheme === "dark") {
28    // eslint-disable-next-line no-console
29    console.log(`LOADING THEME - ${newTheme}`);
30
31    import(/* webpackChunkName: "dark" */ "./style.scss?dark").then(() => {
32      themes[newTheme] = document.querySelector("#theme");
33
34      // eslint-disable-next-line no-console
35      console.log(`LOADED - ${newTheme}`);
36    });
37  }
38}
39
40document.onclick = () => {
41  if (theme === "light") {
42    theme = "dark";
43  } else {
44    theme = "light";
45  }
46
47  loadTheme(theme);
48};

src/dark-theme/_vars.scss

1$background: black;

src/light-theme/_vars.scss

1$background: white;

src/styles.scss

1body {
2  background-color: vars.$background;
3}

public/index.html

1<!DOCTYPE html>
2<html lang="en">
3  <head>
4    <meta charset="UTF-8" />
5    <meta name="viewport" content="width=device-width, initial-scale=1" />
6    <title>Document</title>
7    <link id="theme" rel="stylesheet" type="text/css" href="./main.css" />
8  </head>
9  <body>
10    <script src="./main.js"></script>
11  </body>
12</html>

Media Query Plugin

If you'd like to extract the media queries from the extracted CSS (so mobile users don't need to load desktop or tablet specific CSS anymore) you should use one of the following plugins:

• Media Query Plugin
• Media Query Splitting Plugin

Hooks

The mini-css-extract-plugin provides hooks to extend it to your needs.

beforeTagInsert

SyncWaterfallHook

Called before inject the insert code for link tag. Should return a string

1MiniCssExtractPlugin.getCompilationHooks(compilation).beforeTagInsert.tap(
2  "changeHref",
3  (source, varNames) =>
4    Template.asString([
5      source,
6      `${varNames.tag}.setAttribute("href", "https://github.com/webpack-contrib/mini-css-extract-plugin");`,
7    ])
8);

Contributing

Please take a moment to read our contributing guidelines if you haven't yet done so.

CONTRIBUTING

License

MIT