webpack.prod.js

const { merge } = require('webpack-merge')
const common = require('./webpack.common')
const WorkboxWebpackPlugin = require('workbox-webpack-plugin')
const ImageminWebpackPlugin = require('imagemin-webpack-plugin').default
const ImageminMozjpeg = require('imagemin-mozjpeg')
const CompressionPlugin = require('compression-webpack-plugin')

module.exports = merge(common, {
  mode: 'production',
  devtool: 'source-map',
  optimization: {
    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 WorkboxWebpackPlugin.GenerateSW({
      swDest: './sw.bundle.js'
    }),
    new ImageminWebpackPlugin({
      plugins: [
        ImageminMozjpeg({
          quality: 85,
          progressive: true
        })
      ]
    }),
    new CompressionPlugin()
  ]
})