webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CssMinimizerPlugin = require('css-minimizer-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');

const mode = process.env.NODE_ENV || 'development';

module.exports = {
  optimization: {
    minimizer: [
      new TerserPlugin({
        parallel: true,
        terserOptions: {
          sourceMap: true,
        },
      }),
      new CssMinimizerPlugin({}),
    ],
  },
  entry: [
    'core-js/fn/array/from',
    'core-js/fn/array/includes',
    './src/app.js',
  ],
  mode: mode,
  output: {
    filename: '[name].[contenthash].js',
    path: path.resolve(__dirname, 'dist'),
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'src/index.ejs',
      minify: mode === 'production' ? {
        collapseWhitespace: true,
        removeComments: true,
        removeRedundantAttributes: true,
        removeScriptTypeAttributes: true,
        removeStyleLinkTypeAttributes: true,
        useShortDoctype: true,
      } : false,
    }),
    new MiniCssExtractPlugin({
      filename: '[name].[contenthash].css',
    }),
  ],
  module: {
    rules: [
      {
        test: /\.(scss)$/,
        use: [
          {
            loader: mode === 'production' ? MiniCssExtractPlugin.loader : 'style-loader',
          },
          {
            // Interprets `@import` and `url()` like `import/require()` and will resolve them
            loader: 'css-loader',
          },
          {
            // Loader for webpack to process CSS with PostCSS
            loader: 'postcss-loader',
            options: {
              postcssOptions: {
                plugins: function () {
                  return [
                    require('autoprefixer'),
                  ];
                },
              },
            },
          },
          {
            // Loads a SASS/SCSS file and compiles it to CSS
            loader: 'sass-loader',
          },
        ],
      },
      {
        test: /\.(png|jp(e*)g|svg)$/,
        type: 'asset/resource',
      },
    ],
  },
};