webpack.prod.js

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

module.exports = merge(common, {
  mode: 'production',
  output: {
    filename: '[name].[contenthash].js',
    path: path.resolve(__dirname, 'dist'),
    publicPath: '/',
  },
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        parallel: true,
      }),
      new CssMinimizerPlugin(),
    ],
    splitChunks: {
      chunks: 'all',
    },
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader'],
      },
    ],
  },
  plugins: [
    new CleanWebpackPlugin(),
    new MiniCssExtractPlugin({
      filename: '[name].[contenthash].css',
    }),
  ],
});