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!
replace({
      __DEV__: isProduction ? 'false' : 'true',
      __PROFILE__: isProfiling || !isProduction ? 'true' : 'false',
      __UMD__: isUMDBundle ? 'true' : 'false',
      'process.env.NODE_ENV': isProduction ? "'production'" : "'development'",
    }),
    
    commonjs(),
    
    isProduction &&
      closure(
        Object.assign({}, closureOptions, {
          
          
          assume_function_wrapper: !isUMDBundle,
          
          
          
          
          renaming: !shouldStayReadable,
        })
      ),
    
    
    isProduction && stripUnusedImports(pureExternalModules),
    
    shouldStayReadable && prettier({parser: 'babylon'}),
    
    {
      transformBundle(source) {