1. Dart
2. dart:async
3. ZoneDelegate
4. errorCallback abstract method

##### ZoneDelegate class

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

description

# errorCallback method Null safety

AsyncError? errorCallback (

1. Zone zone,
2. Object error,
3. StackTrace? stackTrace

)

## Implementation

    AsyncError? errorCallback(Zone zone, Object error, StackTrace? stackTrace);