listen method
Implementation
StreamSubscription<T>? listen(
void Function(T value) onData, {
void Function()? onDone,
Function? onError,
bool? cancelOnError,
}) {
StreamSubscription<T>? subscription = stream?.listen(
onData,
onError: onError,
onDone: onDone,
cancelOnError: cancelOnError,
);
return subscription;
}