webpack.config.babel.js

import path from 'path';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import CleanWebpackPlugin from 'clean-webpack-plugin';

module.exports = (_, { mode = 'development' }) => ({
  entry: {
    app: './src/index.js',
  },

  devServer: {
    compress: true,
    port: 4000,
    historyApiFallback: true,
    headers: {
      'Cache-Control': 'public,max-age=31536000',
    },
  },

  plugins: [
    // development
    ...(mode === 'development' ? [] : []),
    // production
    ...(mode === 'production' ? [new CleanWebpackPlugin()] : []),
    // common
    new HtmlWebpackPlugin({
      title: 'Development',
      template: './src/index.pug',
    }),
  ],

  output: {
    filename: '[name].[hash].bundle.js',
    chunkFilename: '[name].[contenthash].bundle.js',
    path: path.resolve(__dirname, 'dist'),
  },

  module: {
    rules: [
      {
        test: /\.js$/,
        use: 'babel-loader',
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.pug$/,
        include: /index\.pug$/,
        use: 'pug-loader',
      },
      {
        test: /\.pug$/,
        exclude: /index\.pug$/,
        use: [
          'html-loader',
          'pug-html-loader',
        ],
      },
    ],
  },

  resolve: {
    modules: ['node_modules'],
    alias: {
      '@app': path.resolve(__dirname, 'src/app'),
      '@components': path.resolve(__dirname, 'src/components'),
    },
  },

  optimization: {
    splitChunks: {
      chunks: 'all',
      maxInitialRequests: Infinity,
      minSize: 0,
      cacheGroups: {
        vendors: {
          test: /[\\/]node_modules[\\/]/,
          name: 'vendor',
        },
      },
    },
  },
});