@class NSString, NSHashTable, NSObject; @protocol OS_dispatch_queue; @interface TLBacklight : NSObject { NSObject<OS_dispatch_queue> *_accessQueue; NSString *_accessQueueLabel; NSHashTable *_observers; BOOL _isObservingBacklight; long long _backlightStatus; } @property (class, readonly) TLBacklight *sharedBacklight; @property (readonly) long long backlightStatus; - (id)init; - (void)dealloc; - (void)removeObserver:(id)a0; - (void)_performBlockOnAccessQueue:(id /* block */)a0; - (void)_assertNotRunningOnAccessQueue; - (void).cxx_destruct; - (void)addObserver:(id)a0; - (void)_assertRunningOnAccessQueue; - (void)_notifyObservers:(id)a0 ofUpdatedBacklightStatus:(long long)a1; - (void)_setBacklightStatus:(long long)a0; - (void)_setObservingBacklight:(BOOL)a0; @end