The 16.5.0 package released to unpkg currently has the production/profiling variant present for cjs builds but there is no equivalent for umd builds. 

i.e. There is the file https://unpkg.com/react@16.5.0/cjs/react.profiling.min.js but there is no https://unpkg.com/react@16.5.0/umd/react.profiling.min.js

It would be great if a future release had the profiling variant packaged as umd as well.

Also thanks for the awesome framework!
await Promise.all([
    
    asyncCopyTo(`${__dirname}/shims/react-native`, 'build/react-native/shims'),
    asyncCopyTo(
      require.resolve('shared/ReactTypes.js'),
      'build/react-native/shims/ReactTypes.js'
    ),
    asyncCopyTo(
      require.resolve('react-native-renderer/src/ReactNativeTypes.js'),
      'build/react-native/shims/ReactNativeTypes.js'
    ),
    asyncCopyTo(`${__dirname}/shims/react-native-fb`, 'build/react-native/fb'),
  ]);
}
async function copyAllShims() {
  await Promise.all([copyWWWShims(), copyRNShims()]);
}
function getTarOptions(tgzName, packageName) {
  
  
  
  const CONTENTS_FOLDER = 'package';
  return {
    src: tgzName,
    dest: `build/node_modules/${packageName}`,
    tar: {
      entries: [CONTENTS_FOLDER],
      map(header) {