webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  mode: 'production',
  entry: './src/index.ts',
  output: {
    path: path.resolve('dist'),
    filename: 'index.js',
    libraryTarget: 'commonjs2',
  },

  plugins: [new MiniCssExtractPlugin()],
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        exclude: /node_modules/,
        use: [{ loader: 'babel-loader' }, { loader: 'ts-loader' }],
      },
      {
        test: /\.js$/,
        use: ['source-map-loader'],
        enforce: 'pre',
      },
      {
        test: /\.css$/,
        include: path.resolve(__dirname, 'src'),
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader'],
      },
      { test: /\.(png|jpe?g|svg)$/, type: 'asset/resource' },
    ],
  },
  resolve: {
    extensions: ['.ts', '.tsx', '.js', '.jsx'],
    alias: {
      react: path.resolve(__dirname, './node_modules/react'),
      'react-dom': path.resolve(__dirname, './node_modules/react-dom'),
    },
    fallback: {
      assert: require.resolve('assert/'),
    },
  },
  externals: {
    // Don't bundle react or react-dom
    react: {
      commonjs: 'react',
      commonjs2: 'react',
      amd: 'React',
      root: 'React',
    },
    'react-dom': {
      commonjs: 'react-dom',
      commonjs2: 'react-dom',
      amd: 'ReactDOM',
      root: 'ReactDOM',
    },
  },
};