react and react-dom have both cjs and umd versions available.

Is it possible to create a umd version of react-test-renderer as well?
externals: ['react', 'stream'],
  },
  
  {
    label: 'art',
    bundleTypes: [UMD_DEV, UMD_PROD, NODE_DEV, NODE_PROD, FB_DEV, FB_PROD],
    moduleType: RENDERER,
    entry: 'react-art',
    global: 'ReactART',
    externals: ['react'],
    babel: opts =>
      Object.assign({}, opts, {
        
        presets: opts.presets.concat([require.resolve('babel-preset-react')]),
      }),
  },
  
  {
    label: 'native',
    bundleTypes: [RN_DEV, RN_PROD],
    moduleType: RENDERER,
    entry: 'react-native-renderer',
    global: 'ReactNativeRenderer',
    externals: [
      'ExceptionsManager',
      'InitializeCore',
      'Platform',
      'RCTEventEmitter',
      'TextInputState',
      'UIManager',