1. Dart
2. dart:async
3. ZoneBinaryCallback<R, T1, T2> typedef

##### dart:async library

1. Classes
2. Completer
3. DeferredLibrary
4. EventSink
5. Future
6. FutureOr
7. MultiStreamController
8. Stream
9. StreamConsumer
10. StreamController
11. StreamIterator
12. StreamSink
13. StreamSubscription
14. StreamTransformer
15. StreamTransformerBase
16. StreamView
17. SynchronousStreamController
18. Timer
19. Zone
20. ZoneDelegate
21. ZoneSpecification
22. Functions
23. runZoned
24. runZonedGuarded
25. scheduleMicrotask
26. Typedefs
27. ControllerCallback
28. ControllerCancelCallback
29. CreatePeriodicTimerHandler
30. CreateTimerHandler
31. ErrorCallbackHandler
32. ForkHandler
33. HandleUncaughtErrorHandler
34. PrintHandler
35. RegisterBinaryCallbackHandler
36. RegisterCallbackHandler
37. RegisterUnaryCallbackHandler
38. RunBinaryHandler
39. RunHandler
40. RunUnaryHandler
41. ScheduleMicrotaskHandler
42. ZoneBinaryCallback
43. ZoneCallback
44. ZoneUnaryCallback
45. Exceptions
46. AsyncError
47. DeferredLoadException
48. TimeoutException

description

# ZoneBinaryCallback<R, T1, T2> typedef Null safety

R ZoneBinaryCallback (

1. T1 arg1,
2. T2 arg2

)

## Implementation

    typedef R ZoneBinaryCallback<R, T1, T2>(T1 arg1, T2 arg2);