type constant Null safety

1. Flutter
2. vm_service
3. OpenFileRef
4. type constant

OpenFileRef class

1. Constructors
2. OpenFileRef
3. Properties
4. hashCode
5. id
6. name
7. runtimeType
8. Methods
9. noSuchMethod
10. toString
11. Operators
12. operator ==
13. Static methods
14. parse
15. Constants
16. type