1. Constructors
2. HistoryMessageGetType
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. V2TIM_GET_CLOUD_NEWER_MSG
13. V2TIM_GET_CLOUD_OLDER_MSG
14. V2TIM_GET_LOCAL_NEWER_MSG
15. V2TIM_GET_LOCAL_OLDER_MSG