onResult property

Implementation

Future<F> get onResult {
  if (_completer == null) {
    _completer = Completer<F>();
    if (_done) {
      if (_streamError != null) {
        _completer!.completeError(_streamError!, _streamStackTrace);
      } else {
        _completer!.complete(_result as F);
      }
    }
  }
  return _completer!.future;
}