webpack.config.js

const path = require('path')
const webpack = require('webpack')

const CssMinimizerPlugin = require('css-minimizer-webpack-plugin')
const TerserPlugin = require('terser-webpack-plugin')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')

module.exports = {
  mode: 'production',
  entry: './src/index.ts',
  output: {
    path: path.resolve('lib'),
    filename: 'index.js',
    libraryTarget: 'commonjs2'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      },
      {
        test: /\.tsx?$/,
        use: 'ts-loader',
        exclude: /node_modules/
      }
    ]
  },
  resolve: {
    extensions: ['.js', '.ts', '.tsx'],
    alias: {
      react: path.resolve(__dirname, './node_modules/react')
    },
    fallback: {
      crypto: false,
      stream: require.resolve('stream-browserify'),
      buffer: require.resolve('buffer')
    }
  },
  externals: {
    // Don't bundle react or react-dom
    react: {
      commonjs: 'react',
      commonjs2: 'react',
      amd: 'React',
      root: 'React'
    }
  },
  plugins: [
    new CleanWebpackPlugin(),
    // Work around for Buffer is undefined:
    // https://github.com/webpack/changelog-v5/issues/10
    new webpack.ProvidePlugin({
      Buffer: ['buffer', 'Buffer']
    }),
    new webpack.ProvidePlugin({
      process: 'process'
    })
  ],
  optimization: {
    minimize: true,
    minimizer: [new CssMinimizerPlugin(), new TerserPlugin()]
  }
}