webpack.prod.config.js

const path = require('path');
const CompressionPlugin = require('compression-webpack-plugin');
const zlib = require('zlib');

const SRC_DIR = path.join(__dirname, '/client/src');
const DIST_DIR = path.join(__dirname, '/client/dist');

module.exports = {
  mode: 'production',
  entry: `${SRC_DIR}/index.js`,
  output: {
    filename: 'bundle.js',
    path: DIST_DIR,
  },
  devtool: 'source-map',
  module: {
    rules: [
      {
        test: /\.(js|jsx)?/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: [
              '@babel/preset-env',
              '@babel/preset-react',
            ],
            plugins: [
              ['@babel/plugin-transform-runtime',
                {
                  regenerator: true,
                },
              ],
            ],
          },
        },
      },
    ],
  },
  plugins: [
    new CompressionPlugin({
      filename: '[path][base].gz',
      algorithm: 'gzip',
      test: /\.js$|\.css$|\.html$/,
      threshold: 10240,
      minRatio: 0.8,
    }),
    new CompressionPlugin({
      filename: '[path][base].br',
      algorithm: 'brotliCompress',
      test: /\.(js|css|html|svg)$/,
      compressionOptions: {
        level: 11,
      },
      threshold: 10240,
      minRatio: 0.8,
    }),
  ],
};