webpack.config.prod.js

const CleanWebpackPlugin = require('clean-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
const MinifyPlugin = require("babel-minify-webpack-plugin");
const path = require('path');

module.exports = function (env, argv) {
  return {
    mode: 'production',
    entry: [
      './src/app.js'
    ],
    optimization: {
      minimizer: [
        new OptimizeCSSAssetsPlugin()
      ]
    }
    ,
    plugins: [
      new CleanWebpackPlugin(), // new CleanWebpackPlugin(['dist']), // (old)
      new HtmlWebpackPlugin({
        title: 'Webpack starter project',
        template: path.resolve('./src/index.html')
      }),
      new MiniCssExtractPlugin({
        filename: "[name].css"
        //chunkFilename: "[id].css"
      }),
      new MinifyPlugin()
    ],
    module: {
      rules: [
        {
          test: /\.scss$/,
          use: [
            MiniCssExtractPlugin.loader,
            "css-loader",
            "sass-loader"
          ]
        },
        {
          test: /\.m?js$/,
          exclude: /(node_modules|bower_components)/,
          use: {
            loader: 'babel-loader',
            options: {
              presets: ['@babel/preset-env']
            }
          }
        },
        {
          test: /\.(jpg|jpeg|gif|png|svg|webp|ico)$/,
          use: [
            {
              loader: "file-loader",
              options: {
                outputPath: './images',
                name: "[name].[ext]",
              },
            }
          ],
        },
        {
            test: /\.ttf$/,                              // for font files, another rule. bugged right now.
            use: [
                {
                    loader: "file-loader",
                    options: {
                        //outputPath: './Fonts',
                        //name: "[name].[ext]",
                        //name: './Fonts/[name].[ext]', // instead of ./font/[hash].[ext]
                        //name: './font/[name].[ext]',
                        outputPath: './font',
                        name: '[name].[ext]',
                    },
                },
            ]
        },
        {
          test: /\.html$/,
          use: {
            loader: 'html-loader',
          }
        },
      ]
    }
  };
}