webpack.prod.js

const path = require('path');
const { merge } = require('webpack-merge');
const common = require('./webpack.common.js');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');

module.exports = merge(common, {
  mode: 'production',
  devtool: 'hidden-source-map',
  output: {
    path: path.join(__dirname, 'dist'),
    filename: '[name].[chunkhash].js',
    clean: true,
    publicPath: '/',
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './public/index.html',
      minify: {
        collapseWhitespace: true,
        removeComments: true,
      },
      hash: true,
    }),
    new CopyWebpackPlugin({
      patterns: [
        { from: 'public/assets', to: 'assets' },
        { from: 'public/manifest.json', to: 'manifest.json' },
        { from: 'public/robots.txt', to: 'robots.txt' },
        { from: 'public/sitemap.xml', to: 'sitemap.xml' },
      ],
    }),
  ],
  optimization: {
    splitChunks: {
      chunks: 'all',
    },
  },
});