webpack.config.js

const path = require('path');
const autoprefixer = require('autoprefixer');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const env = process.env.NODE_ENV || 'development';
const isProd = env === 'production';

const filename = ext => isProd
  ? `[name].[contenthash].${ext}`
  : `[name].${ext}`;

const cssTransforms = [
  {
    loader: MiniCssExtractPlugin.loader,
  },
  'css-loader',
  {
    loader: 'postcss-loader',
    options: {
      postcssOptions: {
        plugins: [
          ['postcss-preset-env'],
        ],
      },
    },
  },
];

const config = {
  entry: {
    main: './src/index.js',
  },
  target: 'web',
  mode: isProd ? 'production' : 'development',
  output: {
    chunkFilename: filename('js'),
    filename: filename('js'),
    path: path.resolve(__dirname, 'dist'),
  },
  module: {
    rules: [
      {
        test: /\.pug/,
        use: {
          loader: 'pug-loader',
        }
      },
      {
        test: /\.(less|css)$/,
        use: [
          ...cssTransforms,
          'less-loader',
        ]
      },
      {
        test: /\.styl$/,
        use: [
          ...cssTransforms,
          'stylus-loader',
        ]
      },
      {
        test: /\.jpe?g$|\.gif$|\.png$|\.svg$|\.woff$|\.woff2$|\.ttf$|\.eot$|\.wav$|\.mp3$/,
        type: 'asset/resource'
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      }
    ]
  },
  devServer: {
    contentBase: path.join(__dirname, 'dist'),
    hot: !isProd,
    inline: true,
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: './src/templates/index.pug',
      minify: {
        collapseWhitespace: isProd,
      },
    }),
    new MiniCssExtractPlugin({
      filename: filename('css'),
    }),
  ]
};

module.exports = config;