IUserService constructor Null safety

IUserService()

1. unself_user
2. unself_user
3. IUserService
4. IUserService constructor

IUserService class

1. Constructors
2. IUserService
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. setThemeMode
9. streamUser
10. toString
11. Operators
12. operator ==