StreamSink<S> constructor Null safety

1. Dart
2. dart:async
3. StreamSink<S>
4. StreamSink constructor

StreamSink class

1. Constructors
2. StreamSink
3. Properties
4. done
5. hashCode
6. runtimeType
7. Methods
8. add
9. addError
10. addStream
11. close
12. noSuchMethod
13. toString
14. Operators
15. operator ==