webpack.config.prod.js

import webpack from 'webpack';
// import MiniCssExtractPlugin from 'mini-css-extract-plugin';
import WebpackMd5Hash from 'webpack-md5-hash';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import path from 'path';
import CopyWebpackPlugin from 'copy-webpack-plugin';

const GLOBALS = {
  'process.env.NODE_ENV': JSON.stringify('production'),
  __DEV__: false,
};

export default {
  stats: 'errors-only',
  resolve: {
    extensions: ['*', '.js', '.jsx', '.json'],
  },
  devtool: 'source-map', // more info:https://webpack.js.org/guides/production/#source-mapping and https://webpack.js.org/configuration/devtool/
  entry: [
    'idempotent-babel-polyfill',
    path.resolve(__dirname, 'app/index'),
  ],
  target: 'web',
  mode: 'production',
  performance: {
    hints: false,
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    publicPath: '/',
    filename: '[name].[chunkhash].js',
  },
  plugins: [
    // Hash the files using MD5 so that their names change when the content changes.
    new WebpackMd5Hash(),

    // Makes sure the file hashes don't change unexpectedly
    new webpack.HashedModuleIdsPlugin(),

    // Tells React to build in prod mode. https://facebook.github.io/react/downloads.html
    new webpack.DefinePlugin(GLOBALS),

    // add the favicon
    new CopyWebpackPlugin([
      { from: './favicon.ico' },
    ]),

    // Generate an external css file with a hash in the filename

    // Generate HTML file that contains references to generated bundles. See here for how this works: https://github.com/ampedandwired/html-webpack-plugin#basic-usage
    new HtmlWebpackPlugin({
      template: './app/index.html',
      filename: 'index.html',
      // favicon: 'src/favicon.ico',
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true,
      },
      hash: true,
      inject: false,
    }),
  ],
  optimization: {
    splitChunks: {
      chunks: 'all',
      minSize: 100000,
      maxSize: 450000,
    },
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/env', '@babel/react'],
            plugins: ['@babel/plugin-proposal-object-rest-spread'],
          },
        },
      },
      {
        test: /\.css$/,
        loader: 'style-loader',
      }, {
        test: /\.css$/,
        loader: 'css-loader',
        query: {
          modules: true,
          localIdentName: '[name]__[local]___[hash:base64:5]&camelCase',
        },
      }, {
        test: /\.css$/,
        loader: 'postcss-loader',
      }, {
        test: /\.(png|jpg|gif|mp3)$/i,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 8192,
            },
          },
        ],
      }, {
        test: /\.svg$/,
        loaders: ['@svgr/webpack', 'url-loader'],
      },
    ],
  },
};