webpack.config.js

const path = require('path');

module.exports = {
  context: path.resolve(__dirname, 'src'),
  entry: './index.js',
  output: {
    path: `${__dirname}/dist`,
    filename: './index.js',
    publicPath: '/',
    libraryTarget: 'commonjs2',
  },
  resolve: {
    extensions: ['.js', '.jsx'],
    modules: ['node_modules'],
  },
  optimization: {
    minimize: true,
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        loader: 'babel-loader',
      },
    ],
  },
  externals: {
    react: {
      commonjs: 'react',
      commonjs2: 'react',
      amd: 'React',
      root: 'React',
    },
    'react-dom': {
      commonjs: 'react-dom',
      commonjs2: 'react-dom',
      amd: 'ReactDOM',
      root: 'ReactDOM',
    },
  },
};