@SafeVarargs public static <U>SimpleReactStream<U> firstOf(final SimpleReactStream<U>... futureStreams){
  return EagerFutureStreamFunctions.firstOf(futureStreams);
}

@ SafeVarargs public static < U > SimpleReactStream < U > firstOf ( final SimpleReactStream < U > ... futureStreams ) { return EagerFutureStreamFunctions . firstOf ( futureStreams ) ; }
return first stream out of provided streams that starts emitted results
