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!
return 'shared/forks/object-assign.umd.js';
  },
  
  
  'shared/ReactSharedInternals': (bundleType, entry, dependencies) => {
    if (entry === 'react') {
      return 'react/src/ReactSharedInternals';
    }
    if (dependencies.indexOf('react') === -1) {
      
      
      return new Error(
        'Cannot use a module that depends on ReactSharedInternals ' +
          'from "' +
          entry +
          '" because it does not declare "react" in the package ' +
          'dependencies or peerDependencies. For example, this can happen if you use ' +
          'warning() instead of warningWithoutStack() in a package that does not ' +
          'depend on React.'
      );
    }
    return null;
  },
  
  'shared/ReactFeatureFlags': (bundleType, entry) => {
    switch (entry) {
      case 'react-native-renderer':
        switch (bundleType) {
          case RN_FB_DEV:
          case RN_FB_PROD: