StringSink constructor Null safety

1. Flutter
2. dart:core
3. StringSink
4. StringSink constructor

StringSink class

1. Constructors
2. StringSink
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. write
10. writeAll
11. writeCharCode
12. writeln
13. Operators
14. operator ==