webpack.common.js

const HtmlWebpackPlugin = require('html-webpack-plugin')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const ServiceWorkerWebpackPlugin = require('serviceworker-webpack-plugin')
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const ImageminWebpWebpackPlugin = require('imagemin-webp-webpack-plugin');
const path = require('path')

module.exports = {
  entry: path.resolve(__dirname, 'src/scripts/index.js'),
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js'
  },
  optimization: {
   splitChunks: {
     chunks: 'all',
     minSize: 20000,
     maxSize: 20000,
     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: /\.css$/,
        use: [
          {
            loader: 'style-loader'
          },
          {
            loader: 'css-loader'
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: path.resolve(__dirname, 'src/templates/index.html'),
      filename: 'index.html'
    }),
    new CopyWebpackPlugin({
      patterns: [
        {
          from: path.resolve(__dirname, 'src/public/'),
          to: path.resolve(__dirname, 'dist/')
        }
      ]
    }),
    new ServiceWorkerWebpackPlugin({
      entry: path.resolve(__dirname, 'src/scripts/ServiceWorker.js')
    }),
    new BundleAnalyzerPlugin(),
    new ImageminWebpWebpackPlugin({
  config: [
    {
      test: /\.(jpe?g|png)/,
      options: {
        quality: 50
      }
    }
  ],
  overrideExtension: true,
})
  ]
}