webpack.prod.config.js

const path = require('path')
const HtmlWebPackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');

module.exports = {
  entry: {
    main: './src/index.js'
  },
  output: {
    path: path.join(__dirname, 'dist'),
    publicPath: '/',
    filename: '[name].js'
  },
  target: 'web',
  devtool: '#source-map',
  // Webpack 4 does not have a CSS minifier, although
  // Webpack 5 will likely come with one
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        cache: true,
        parallel: true,
        sourceMap: true // set to true if you want JS source maps
      }),
      new OptimizeCSSAssetsPlugin({})
    ]
  },
  module: {
    rules: [
      {
        // Transpiles ES6-8 into ES5
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      },
      {
        // Loads the javacript into html template provided.
        // Entry point is set below in HtmlWebPackPlugin in Plugins 
        test: /\.html$/,
        use: [
          {
            loader: 'html-loader',
            options: { minimize: true }
          }
        ]
      },
      {
        // Loads images into CSS and Javascript files
        test: /\.jpg$/,
        use: [{loader: 'url-loader'}]
      },
      {
        // Loads CSS into a file when you import it via Javascript
        // Rules are set in MiniCssExtractPlugin
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader']
      },
    ]
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: './src/html/index.html',
      filename: './index.html'
    }),
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css'
    })
  ]
}