webpack.config.js

const path = require('path');

module.exports = {
  mode: 'development',
  entry: './src/index.ts',
  output: {
    path: path.resolve(__dirname, 'dist/umd'),
    filename: 'index.js',
    library: {
      type: 'umd',
      name: 'PatternizeTravelMap'
    },
    globalObject: 'this'
  },
  module: {
    rules: [
      {
        test: /\.(ts|tsx)$/,
        use: 'ts-loader',
        exclude: /node_modules/
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      }
    ]
  },
  resolve: {
    extensions: ['.tsx', '.ts', '.js']
  },
  externals: {
    react: {
      commonjs: 'react',
      commonjs2: 'react',
      amd: 'react',
      root: 'React'
    },
    'react-dom': {
      commonjs: 'react-dom',
      commonjs2: 'react-dom',
      amd: 'react-dom',
      root: 'ReactDOM'
    },
    'mapbox-gl': {
      commonjs: 'mapbox-gl',
      commonjs2: 'mapbox-gl',
      amd: 'mapbox-gl',
      root: 'mapboxgl'
    }
  }
};