webpack.prod.babel.js

// Important modules this config uses
const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const WebpackPwaManifest = require('webpack-pwa-manifest')
const OfflinePlugin = require('offline-plugin')
const { HashedModuleIdsPlugin } = require('webpack')

module.exports = require('./webpack.base.babel')({
  mode: 'production',

  // In production, we skip all hot-reloading stuff
  entry: [path.join(process.cwd(), 'app/app.js')],

  // Utilize long-term caching by adding content hashes (not compilation hashes) to compiled assets
  output: {
    path: path.join(__dirname, '../build'),
    filename: '[name].[chunkhash].js',
    chunkFilename: '[name].[chunkhash].chunk.js',
    publicPath: '/'
  },

  optimization: {
    minimize: true,
    nodeEnv: 'production',
    sideEffects: true,
    concatenateModules: true,
    splitChunks: {
      chunks: "async",
      minSize: 30000,
      minChunks: 1,
      maxAsyncRequests: 5,
      maxInitialRequests: 3,
      name: true,
      cacheGroups: {
        default: {
          minChunks: 2,
          priority: -20,
          reuseExistingChunk: true,
        },
        vendors: {
          test: /[\\/]node_modules[\\/]/,
          name: 'vendors',
          enforce: true,
          chunks: 'all',
        }
      },
    },
    runtimeChunk: true
  },

  plugins: [
    // Minify and optimize the index.html
    new HtmlWebpackPlugin({
      template: 'app/index.html',
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true
      },
      inject: true
    }),

    // Put it in the end to capture all the HtmlWebpackPlugin's
    // assets manipulations and do leak its manipulations to HtmlWebpackPlugin
    new OfflinePlugin({
      relativePaths: false,
      publicPath: '/',
      appShell: '/',

      // No need to cache .htaccess. See http://mxs.is/googmp,
      // this is applied before any match in `caches` section
      excludes: ['.htaccess'],

      caches: {
        main: [':rest:'],

        // All chunks marked as `additional`, loaded after main section
        // and do not prevent SW to install. Change to `optional` if
        // do not want them to be preloaded at all (cached only when first loaded)
        additional: ['*.chunk.js']
      },

      // Removes warning for about `additional` section usage
      safeToUseOptionalCaches: true
    }),

    new WebpackPwaManifest({
      name: 'Komiksea',
      short_name: 'Komiksea',
      description: 'Komiksea your komik friend!',
      background_color: '#fafafa',
      theme_color: '#b1624d',
      inject: true,
      ios: true,
      icons: [
        {
          src: path.resolve('app/images/icon-512x512.png'),
          sizes: [72, 96, 120, 128, 144, 152, 167, 180, 192, 384, 512]
        },
        {
          src: path.resolve('app/images/icon-512x512.png'),
          sizes: [120, 152, 167, 180],
          ios: true
        }
      ]
    }),

    new HashedModuleIdsPlugin({
      hashFunction: 'sha256',
      hashDigest: 'hex',
      hashDigestLength: 20
    })
  ],

  performance: {
    assetFilter: assetFilename =>
      !/(\.map$)|(^(main\.|favicon\.))/.test(assetFilename)
  }
})