webpack.prod.js

const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const CompressionPlugin = require('compression-webpack-plugin');
const { merge } = require('webpack-merge');
const common = require('./webpack.common');

module.exports = merge(common, {
  mode: 'production',
  output: {
    filename: '[name].bundle.js',
    chunkFilename: '[name]-[chunkhash].bundle.js',
  },
  optimization: {
    minimize: true,
    minimizer: [new TerserPlugin()],
    splitChunks: {
      chunks: 'all',
      minSize: 20000,
      maxSize: 70000,
      minChunks: 1,
      maxAsyncRequests: 30,
      maxInitialRequests: 30,
      automaticNameDelimiter: '~',
      enforceSizeThreshold: 50000,
      cacheGroups: {
        defaultVendors: {
          test: /[\\/]node_modules[\\/]/,
          priority: -10,
        },
        default: {
          minChunks: 2,
          priority: -20,
          reuseExistingChunk: true,
        },
      },
    },
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: '/node_modules/',
        use: [
          {
            loader: 'babel-loader',
            options: {
              presets: ['@babel/preset-env'],
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new CleanWebpackPlugin(),
    new CompressionPlugin({
      filename: '[path][base].gz',
      algorithm: 'gzip',
      test: /\.js$|\.css$|\.html$/,
      threshold: 10240,
      minRatio: 0.8,
    }),
    new CompressionPlugin({
      filename: '[path][base].br',
      algorithm: 'brotliCompress',
      test: /\.(js|css|html|svg)$/,
      threshold: 10240,
      minRatio: 0.8,
    }),
  ],
});