webpack.prod.js

const merge = require('webpack-merge');
const common = require('./webpack.common.js');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ClosurePlugin = require('closure-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
// const PrepackWebpackPlugin = require('prepack-webpack-plugin').default;

module.exports = merge(common, {
  mode: 'production',
  output: {
    publicPath: 'dist/',
    filename: '[name].js'
  },
  plugins: [
    new MiniCssExtractPlugin(),
    new HtmlWebpackPlugin({
      chunks: ['main'],
      filename: '../index.html',
      minify: {
        collapseWhitespace: true
      }
    }),
    new HtmlWebpackPlugin({
      chunks: ['settings'],
      filename: '../settings.html',
      minify: {
        collapseWhitespace: true
      }
    }),
    new HtmlWebpackPlugin({
      chunks: ['help'],
      filename: '../help.html',
      minify: {
        collapseWhitespace: true
      }
    }),
    new OptimizeCSSAssetsPlugin({})
    // new PrepackWebpackPlugin({
    //   mathRandomSeed: true
    // })
  ],
  module: {
    rules: [
      {
        test: /\.(sa|sc|c)ss$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          'sass-loader'
        ]
      }
    ]
  },
  optimization: {
    // minimizer: [
    //   new ClosurePlugin({ mode: 'STANDARD' }, {})
    // ]
    usedExports: true
  }
});