@class NSString, NSMutableDictionary, NSMutableSet, NSObject, NSUserDefaults; @protocol OS_dispatch_queue; @interface _REEngineDefaults : NSObject { NSString *_domain; NSUserDefaults *_defaults; NSMutableSet *_registeredPaths; NSMutableDictionary *_registeredBlocks; NSObject<OS_dispatch_queue> *_registrationQueue; } + (id)globalDefaults; + (id)defaultsForEngine:(id)a0; - (id)initWithDomain:(id)a0; - (void)dealloc; - (void)observeValueForKeyPath:(id)a0 ofObject:(id)a1 change:(id)a2 context:(void *)a3; - (void).cxx_destruct; - (id)_domainName; - (BOOL)_BOOLValueForKey:(id)a0 set:(BOOL *)a1; - (long long)_NSIntegerValueForKey:(id)a0 set:(BOOL *)a1; - (id)_idValueForKey:(id)a0 set:(BOOL *)a1; - (void)_registerCallback:(id /* block */)a0 forKey:(id)a1; @end