ByteConversionSinkBase constructor Null safety

1. Flutter
2. dart:convert
3. ByteConversionSinkBase
4. ByteConversionSinkBase constructor

ByteConversionSinkBase class

1. Constructors
2. ByteConversionSinkBase
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. add
8. addSlice
9. close
10. noSuchMethod
11. toString
12. Operators
13. operator ==