1. Dart
2. dart:async
3. StreamController<T>
4. hasListener property

##### StreamController class

1. Constructors
2. StreamController
3. broadcast
4. Properties
5. done
6. hashCode
7. hasListener
8. isClosed
9. isPaused
10. onCancel
11. onListen
12. onPause
13. onResume
14. runtimeType
15. sink
16. stream
17. Methods
18. add
19. addError
20. addStream
21. close
22. noSuchMethod
23. toString
24. Operators
25. operator ==

description

# hasListener property Null safety

bool hasListener

Whether there is a subscriber on the Stream.

## Implementation

    bool get hasListener;