webpack.config.js

const DependencyExtractionWebpackPlugin = require('@wordpress/dependency-extraction-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const path = require('path');

const outputPath = 'dist';

const entryPoints = {
  '01': './01 - single field/01.jsx',
  '02': './02 - multiple fields/02.jsx',
  '03': './03 - toolbar/03.jsx',
  '04': './04 - sidebar/04.jsx',
  '04b': './04b - more sidebar/04b.jsx',
  '05': './05 - nested blocks/05.jsx',
  '06': './06 - dynamic block/06.jsx',
  '06b': './06b - static to dynamic/06b.jsx',
  '07': './07 - link popup/07.jsx',
};

module.exports = {
  entry: entryPoints,
  output: {
    path: path.resolve(__dirname, outputPath),
    filename: '[name].js',
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].css',
    }),

    new DependencyExtractionWebpackPlugin({
      injectPolyfill: true,
    }),
  ],
  module: {
    rules: [
      {
        test: /\.s?[ac]ss$/i,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          'sass-loader',
        ],
      },
      {
        test: /\.(jpg|jpeg|png|gif|woff|woff2|eot|ttf|svg)$/i,
        use: 'url-loader?limit=1024',
      },
      {
        test: /\.jsx$/i,
        use: [
          require.resolve('thread-loader'),
          {
            loader: require.resolve('babel-loader'),
            options: {
              cacheDirectory: process.env.BABEL_CACHE_DIRECTORY || true,
              babelrc: false,
              configFile: false,
              presets: [
                require.resolve('@wordpress/babel-preset-default'),
              ],
            },
          },
        ],
      },
    ],
  },
};