html5-boilerplate/dist/webpack.config.prod.js

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

module.exports = merge(common, {
  mode: 'production',
  plugins: [
    new HtmlWebpackPlugin({
      template: './index.html'
    }),
    new CopyPlugin({
      patterns: [
        { from: 'img', to: 'img' },
        { from: 'css', to: 'css' },
        { from: 'js/vendor', to: 'js/vendor' },
        { from: 'icon.svg', to: 'icon.svg'},
        { from: 'favicon.ico', to: 'favicon.ico'},
        { from: 'tile-wide.png', to: 'tile-wide.png'},
        { from: 'robots.txt', to: 'robots.txt'},
        { from: 'icon.png', to: 'icon.png'},
        { from: '404.html', to: '404.html'},
        { from: 'site.webmanifest', to: 'site.webmanifest'},
        { from: 'tile.png', to: 'tile.png'}
      ],
    })
  ],
});