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 createBundle(bundle, FB_WWW_PROD);
    await createBundle(bundle, FB_WWW_PROFILING);
    await createBundle(bundle, RN_OSS_DEV);
    await createBundle(bundle, RN_OSS_PROD);
    await createBundle(bundle, RN_OSS_PROFILING);
    await createBundle(bundle, RN_FB_DEV);
    await createBundle(bundle, RN_FB_PROD);
    await createBundle(bundle, RN_FB_PROFILING);
  }
  await Packaging.copyAllShims();
  await Packaging.prepareNpmPackages();
  if (syncFBSourcePath) {
    await Sync.syncReactNative(syncFBSourcePath);
  } else if (syncWWWPath) {
    await Sync.syncReactDom('build/facebook-www', syncWWWPath);
  }
  console.log(Stats.printResults());
  if (!forcePrettyOutput) {
    Stats.saveResults();
  }
  if (shouldExtractErrors) {
    console.warn(
      '\nWarning: this build was created with --extract-errors enabled.\n' +
        'this will result in extremely slow builds and should only be\n' +
        'used when the error map needs to be rebuilt.\n'
    );
  }
}
buildEverything();