@class NSString, NSObject; @interface AVNotificationSubscription : NSObject <AVCancellable> { NSObject *_object; id _observerToken; id /* block */ _callback; struct OpaqueFigSimpleMutex { } *_cancelMutex; } @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; @end