webpack.config.js

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

module.exports = {
  entry: './src/index.ts',
  mode: 'production',
  output: {
    filename: 'index.js',
    path: path.resolve(__dirname, 'dist'),
    library: 'USAMap',
    libraryTarget: 'umd',
    globalObject: 'this',
    umdNamedDefine: true,
  },
  resolve: {
    extensions: ['.tsx', '.ts', '.js'],
  },
  module: {
    rules: [
      {
        test: /\.(ts|tsx)$/,
        use: 'ts-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },
  plugins: [
    new webpack.DefinePlugin({
      'self': 'typeof self !== "undefined" ? self : this',
    }),
  ],
  externals: {
    react: {
      commonjs: 'react',
      commonjs2: 'react',
      amd: 'react',
      root: 'React',
    },
    'react-dom': {
      commonjs: 'react-dom',
      commonjs2: 'react-dom',
      amd: 'react-dom',
      root: 'ReactDOM',
    },
  },
};