##### ZoneSpecification class

1. Constructors
2. ZoneSpecification
3. from
4. Properties
5. createPeriodicTimer
6. createTimer
7. errorCallback
8. fork
9. handleUncaughtError
10. print
11. registerBinaryCallback
12. registerCallback
13. registerUnaryCallback
14. run
15. runBinary
16. runUnary
17. scheduleMicrotask
18. hashCode
19. runtimeType
20. Methods
21. noSuchMethod
22. toString
23. Operators
24. operator ==

# registerCallback property

RegisterCallbackHandler<R> registerCallback

## Implementation

    RegisterCallbackHandler get registerCallback;