MuteState constructor Null safety

1. sendbird_sdk
2. enums
3. MuteState
4. MuteState const constructor

MuteState enum

1. Constructors
2. MuteState
3. Values
4. unmuted
5. muted
6. Properties
7. hashCode
8. index
9. runtimeType
10. Methods
11. noSuchMethod
12. toString
13. Operators
14. operator ==
15. Constants
16. values