If you happen to have a custom Webpack setup, you may be wondering how to set up CSS with Webpack. This short tutorial walks you through the process. First of all, you need to install a CSS loader and a style loader to your dev dependencies:

npm install --save-dev css-loader style-loader

And second, you can use both loaders for all CSS files in your Webpack configuration:

...

module.exports = {
  ...
  module: {
    rules: [
      ...
      {
        test: /\.(css)$/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },
  ...
};

Then in a new src/style.css file, add some CSS to it:

h1 {
  color: red;
}

And in your src/index.js file, or any other JS file, import this new CSS file:

import './style.css';

That’s it. From here you can use CSS in your JavaScript project which is powered by Webpack.

CSS with Webpack in Production

If you happen to have a Webpack configuration for development and production, you will need a different configuration for production when using CSS.

First, install the MiniCssExtractPlugin for Webpack to your dev dependencies:

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

And second, use it in your Webpack’s production configuration instead of style loader and additionally as a plugin:

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

module.exports = {
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.(css)$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
        ],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin(),
    ...
  ],
  ...
};

That’s it. Once you build your project with Webpack, you will see the style files showing up in your dist/ folder.