webpack.config.js

const path = require('path');
const TerserPlugin = require('terser-webpack-plugin')
const HtmlWebpackInlineSourcePlugin = require('html-webpack-inline-source-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const HTMLInlineCSSWebpackPlugin = require("html-inline-css-webpack-plugin").default;
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          "css-loader",
        ],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      minify: {
        collapseWhitespace: true,
        useShortDoctype: true
      },
      inlineSource: '.js$',
      title: 'Darkside'
    }),
    new MiniCssExtractPlugin({
      filename: 'style.css'
    }),
    new HTMLInlineCSSWebpackPlugin(),
    new HtmlWebpackInlineSourcePlugin()
  ],

  entry: './dist/app.js',
  mode: 'production',
  devtool: 'source-map',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js'
  },
  optimization: {
    minimize: true,
    minimizer: [ 
      new TerserPlugin({
        parallel: true,
        terserOptions: {
          ecma: 6,
          output: {
            comments: false
          }
        },
        sourceMap: true,
      }),
      new OptimizeCSSAssetsPlugin()
    ],
  },
};