StreamSubscription<T> constructor Null safety

1. Dart
2. dart:async
3. StreamSubscription<T>
4. StreamSubscription constructor

StreamSubscription class

1. Constructors
2. StreamSubscription
3. Properties
4. hashCode
5. isPaused
6. runtimeType
7. Methods
8. asFuture
9. cancel
10. noSuchMethod
11. onData
12. onDone
13. onError
14. pause
15. resume
16. toString
17. Operators
18. operator ==