@class NSString; @interface _BKSEventFocusChangeObserverInfo : NSObject <BSInvalidatable> @property unsigned long long propertyUpdateGeneration; @property (getter=isValid) BOOL valid; @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; - (id)init; - (void)invalidate; @end