joystream/pioneer/.storybook/webpack.config.js

const path = require('path')
const TsconfigPathsPlugin = require('tsconfig-paths-webpack-plugin');
module.exports = ({ config }) => {

// Post CSS loader for sources:
config.module.rules.push({
  test: /\.css$/,
  include: path.resolve(__dirname, '../packages'),
  exclude: /(node_modules)/,
  use: [
    {
      loader: require.resolve('postcss-loader'),
      options: {
        // Set postcss.config.js config path && ctx
        config: {
          path: '../postcss.config.js',
        },
        ident: 'postcss',
        plugins: () => [
          require('precss'),
          require('autoprefixer'),
          require('postcss-simple-vars'),
          require('postcss-nested'),
          require('postcss-import'),
          require('postcss-clean')(),
          require('postcss-flexbugs-fixes')
        ]
      }
    }
  ]
});

// TypeScript loader (via Babel to match polkadot/apps)
config.module.rules.push({
  test: /\.(js|ts|tsx)$/,
  exclude: /(node_modules)/,
  use: [
    {
      loader: require.resolve('babel-loader'),
      options: require('@polkadot/dev/config/babel')
    },
  ],
});
config.resolve.extensions.push('.js', '.ts', '.tsx');

// TSConfig, uses the same file as packages
config.resolve.plugins = config.resolve.plugins || [];
config.resolve.plugins.push(
  new TsconfigPathsPlugin({
    configFile: path.resolve(__dirname, '../tsconfig.json'),
  })
);

// Stories parser
config.module.rules.push({
    test: /\.stories\.tsx?$/,
    loaders: [require.resolve('@storybook/source-loader')],
    enforce: 'pre',
});

// CSS preprocessors
config.module.rules.push(
    {
        test: /\.s[ac]ss$/i,
        use: [
            // Creates `style` nodes from JS strings
            'style-loader',
            // Translates CSS into CommonJS
            'css-loader',
            // Compiles Sass to CSS
            'sass-loader',
        ],
    },
    {
        test: /\.less$/,
        loaders: [ 'style-loader', 'css-loader', 'less-loader' ]
    }
);

return config;
};