webpack.development.config.js

const path = require('path');

module.exports = {
  mode: 'development',
  entry: './src/index.js',
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader']
      }
    ]
  },
  resolve: {
    extensions: ['*', '.js', '.jsx']
  },
  devtool: 'eval-source-map',
  externals: {
    react: {
      commonjs: "react",
      commonjs2: "react",
      amd: "React",
      root: "React"
    },
    "react-dom": {
      commonjs: "react-dom",
      commonjs2: "react-dom",
      amd: "ReactDOM",
      root: "ReactDOM"
    }
  },
  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'duxact.development.js',
    globalObject: 'this',
    library: 'duxact',
    libraryTarget: 'umd',
    publicPath: '/',
    umdNamedDefine: true
  }
};