webpack.prod.js

const common = require('./webpack.common');
const { merge } = require('webpack-merge');
const CssMinimizerPlugin = require('css-minimizer-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = merge(common, {
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.css$/i,
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader'],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: './index.html',
      minify: {
        collapseWhitespace: true,
        keepClosingSlash: true,
        removeComments: true,
        removeRedundantAttributes: true,
        removeScriptTypeAttributes: true,
        removeStyleLinkTypeAttributes: true,
        useShortDoctype: true,
        removeAttributeQuotes: true,
      },
      scriptLoading: 'defer',
      hash: true,
      inject: true,
    }),
  ],
  optimization: {
    minimizer: [
      '...',
      new MiniCssExtractPlugin({ filename: 'index.css' }),
      new CssMinimizerPlugin({
        minimizerOptions: {
          preset: [
            'default',
            {
              discardComments: { removeAll: true },
            },
          ],
        },
      }),
      new TerserPlugin(),
    ],
  },
});