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BUNDLERS_INTEGRATION.md

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Bundlers Integration

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Pre-requisites

If you use Babel in your project, make sure to have a config file for Babel in your project root with the plugins and presets you use. Otherwise Linaria won't be able to parse the code.

Bundlers

Please note, that @babel/core is a peer dependency of all loaders. Do not forget to add it to devDependencies list in your project.

webpack

To use Linaria with webpack, in your webpack config, add @linaria/webpack-loader under module.rules:

{
  test: /\.js$/,
  use: [
    { loader: 'babel-loader' },
    {
      loader: '@linaria/webpack-loader',
      options: {
        sourceMap: process.env.NODE_ENV !== 'production',
      },
    }
  ],
}

Make sure that @linaria/webpack-loader is included after babel-loader.

In order to have your styles extracted, you'll also need to use css-loader and MiniCssExtractPlugin. First, install them:

yarn add --dev css-loader mini-css-extract-plugin

Import mini-css-extract-plugin at the top of your webpack config:

const MiniCssExtractPlugin = require('mini-css-extract-plugin');

Now add the following snippet in under module.rules:

{
  test: /\.css$/,
  use: [
    {
      loader: MiniCssExtractPlugin.loader,
    },
    {
      loader: 'css-loader',
      options: {
        sourceMap: process.env.NODE_ENV !== 'production',
      },
    },
  ],
},

Then add the following under plugins:

new MiniCssExtractPlugin({
  filename: 'styles.css',
});

This will extract the CSS from all files into a single styles.css. Then you can link to this file in your HTML file manually or use something like HTMLWebpackPlugin.

It will also hot reload your styles when in a development environment.

For production usage, you should include a hash in the filename:

new MiniCssExtractPlugin({
  filename: 'styles-[contenthash].css',
});

Using a hash like this allows for a far future Expires header to be used, to improve cache efficiency. To link to the correct filename, you can either use HTMLWebpackPlugin for a static HTML file, or assets-webpack-plugin to save the filename to a JSON file which you can then read in your server-side code.

Linaria integrates with your CSS pipeline, so you can always perform additional operations on the CSS, for example, using postcss plugins such as clean-css to further minify your CSS.

Full example

Here is an example webpack config with Linaria:

const webpack = require('webpack');
const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const dev = process.env.NODE_ENV !== 'production';

module.exports = {
  mode: dev ? 'development' : 'production',
  devtool: 'source-map',
  entry: {
    app: './src/index',
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    publicPath: '/dist/',
    filename: '[name].bundle.js',
  },
  optimization: {
    noEmitOnErrors: true,
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': { NODE_ENV: JSON.stringify(process.env.NODE_ENV) },
    }),
    new MiniCssExtractPlugin({ filename: 'styles.css' }),
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: [
          { loader: 'babel-loader' },
          {
            loader: '@linaria/webpack-loader',
            options: { sourceMap: dev },
          },
        ],
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
          },
          {
            loader: 'css-loader',
            options: { sourceMap: dev },
          },
        ],
      },
      {
        test: /\.(jpg|png|gif|woff|woff2|eot|ttf|svg)$/,
        use: [{ loader: 'file-loader' }],
      },
    ],
  },
  devServer: {
    contentBase: [path.join(__dirname, 'public')],
    historyApiFallback: true,
  },
};

You can copy this file to your project if you are starting from scratch.

To install the dependencies used in the example config, run:

yarn add --dev webpack webpack-cli webpack-dev-server mini-css-extract-plugin css-loader file-loader babel-loader @linaria/webpack-loader

You can now run the dev server by running webpack-dev-server and build the files by running webpack.

Options

The loader accepts the following options:

  • sourceMap: boolean (default: false):

    Setting this option to true will include source maps for the generated CSS so that you can see where source of the class name in devtools. We recommend to enable this only in development mode because the sourcemap is inlined into the CSS files.

  • cacheProvider: undefined | string | ICache (default: undefined): By default Linaria use a memory cache to store temporary CSS files. But if you are using this loader with thread-loader you should use some consistent cache to prevent some unexpected issues. This options support a ICache instance or a path to NodeJS module which export a ICache instance as module.exports

    interface ICache {
  get: (key: string) => Promise<string>;
  set: (key: string, value: string) => Promise<void>
}

  • extension: string (default: '.linaria.css'):

    An extension of the intermediate CSS files.

  • preprocessor: 'none' | 'stylis' | Function (default: 'stylis')

    You can override the pre-processor if you want to override how the loader processes the CSS.

    • 'none': This will disable pre-processing entirely and the CSS will be left as you wrote it.

      You might want to do it if you want to use non-standard syntax such as Sass or custom postcss syntax. Features such as nesting will no longer work with this option. You need to specify a loader such as sass-loader for .linaria.css files which handles the syntax you wrote.

    • 'stylis': This is the default pre-processor using stylis.js.

      This option also applies a custom stylis plugin to correct the relative paths inside url(...) expressions so that css-loader can resolve them properly.

    • Function: You can pass a custom function which receives the selector and cssText strings. It should return the resulting CSS code.

      A very basic implementation may look like this: (selector, cssText) => `${selector} { ${cssText} }`;.

    Changing the preprocessor doesn't affect the following operations:

    • The class names are always generated by the library and the pre-processor cannot change it.
    • Dynamic interpolations are always replaced with CSS variables.
    • Interpolations for JS objects always generate syntax used by default.

    Note that if you use a custom syntax, you also need to specify the syntax in your stylelint.config.js to properly lint the CSS.

In addition to the above options, the loader also accepts all the options supported in the configuration file.

You can pass options to the loader like so:

{
  loader: '@linaria/webpack-loader',
  options: {
    sourceMap: false,
  },
}

esbuild

To use Linaria with esbuild, you don't need to install any external package since esbuild handles CSS by itself:

yarn add --dev @linaria/esbuild

Then add it to your esbuild config:

import linaria from '@linaria/esbuild';
import esbuild from 'esbuild';

const prod = process.env.NODE_ENV === 'production';

esbuild
  .build({
    entryPoints: ['src/index.ts'],
    outdir: 'dist',
    bundle: true,
    minify: prod,
    plugins: [
      linaria({
        sourceMap: prod,
      }),
    ],
  })
  .catch(() => process.exit(1));

Rollup

To use Linaria with Rollup, you need to use it together with a plugin which handles CSS files, such as rollup-plugin-css-only:

yarn add --dev rollup-plugin-css-only @linaria/rollup

Then add them to your rollup.config.js:

import linaria from '@linaria/rollup';
import css from 'rollup-plugin-css-only';

export default {
  plugins: [
    linaria({
      sourceMap: process.env.NODE_ENV !== 'production',
    }),
    css({
      output: 'styles.css',
    }),
  ],
};

If you are using @rollup/plugin-babel as well, ensure the linaria plugin is declared earlier in the plugins array than your babel plugin.

import linaria from '@linaria/rollup';
import css from 'rollup-plugin-css-only';
import babel from '@rollup/plugin-babel';

export default {
  plugins: [
    linaria({
      sourceMap: process.env.NODE_ENV !== 'production',
    }),
    css({
      output: 'styles.css',
    }),
    babel({}),
    /* rest of your plugins */
  ],
};

Svelte

Contents

Rollup

Take a look: d964432

Install rollup-plugin-css-only and update rollup.config.js

import svelte from 'rollup-plugin-svelte';
import css from 'rollup-plugin-css-only'; // for CSS bundling
import linaria from '@linaria/rollup';

const dev = process.env.NODE_ENV !== 'production';

export default {
  ...
  plugins: [
    svelte({
      dev,
      // allow `plugin-css-only` to bundle with CSS generated by linaria
      emitCss: true,
    }),
    linaria({
      sourceMap: dev,
    }),
    css({
      output: '<OUT_FOLDER>/bundle.css',
    }),
  ],
};

IMPORTANT: rollup-plugin-css-only generates incorrect sourcemaps (see thgh/rollup-plugin-css-only#10). Use an alternative CSS plugin such as rollup-plugin-postcss instead in the same way as above.

Webpack

Take a look: 5ffd69d

Update webpack.config.js with the following:

const prod = process.env.NODE_ENV === 'production';

const linariaLoader = {
  loader: '@linaria/webpack-loader',
  options: {
    sourceMap: !prod,
  },
};

module.exports = {
  ...
  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /node_modules/,
        use: [linariaLoader],
      },
      {
        test: /\.svelte$/,
        use: [
          linariaLoader,
          {
            loader: 'svelte-loader',
            options: {
              dev: !prod,
              emitCss: true,
              hotReload: true,
            },
          },
        ],
      },
      ...(CSS rules)
    ],
  },
};