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 null;
    }
  },
  'schedule/tracing': (bundleType, entry, dependencies) => {
    switch (bundleType) {
      case UMD_DEV:
      case UMD_PROD:
        if (dependencies.indexOf('react') === -1) {
          
          
          return null;
        }
        
        
        return 'shared/forks/ScheduleTracing.umd.js';
      default:
        
        return null;
    }
  },
  
  'shared/invariant': (bundleType, entry) => {
    switch (bundleType) {
      case FB_WWW_DEV:
      case FB_WWW_PROD:
      case FB_WWW_PROFILING:
        return 'shared/forks/invariant.www.js';
      default:
        return null;
    }