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!
entry,
  externals,
  updateBabelOptions,
  filename,
  packageName,
  bundleType,
  globalName,
  moduleType,
  modulesToStub,
  pureExternalModules
) {
  const findAndRecordErrorCodes = extractErrorCodes(errorCodeOpts);
  const forks = Modules.getForks(bundleType, entry, moduleType);
  const isProduction = isProductionBundleType(bundleType);
  const isProfiling = isProfilingBundleType(bundleType);
  const isUMDBundle = bundleType === UMD_DEV || bundleType === UMD_PROD;
  const isFBBundle =
    bundleType === FB_WWW_DEV ||
    bundleType === FB_WWW_PROD ||
    bundleType === FB_WWW_PROFILING;
  const isRNBundle =
    bundleType === RN_OSS_DEV ||
    bundleType === RN_OSS_PROD ||
    bundleType === RN_OSS_PROFILING ||
    bundleType === RN_FB_DEV ||
    bundleType === RN_FB_PROD ||
    bundleType === RN_FB_PROFILING;