promiseToFuture<T> function

Future<T> promiseToFuture <T>(dynamic jsPromise)

Implementation 

Future<T> promiseToFuture<T>(jsPromise) {
  var completer = new Completer<T>();

  var thenSuccessCode = (promiseValue) => completer.complete(promiseValue);
  var thenErrorCode = (promiseError) => completer.completeError(promiseError);

  JS("", "#.then(#, #)", jsPromise, convertDartClosureToJS(thenSuccessCode, 1),
      convertDartClosureToJS(thenErrorCode, 1));

  return completer.future;
}