@class NSError, NSObject; @protocol OS_dispatch_semaphore; @interface SKSyncCommand : NSObject @property (retain, nonatomic) NSObject<OS_dispatch_semaphore> *semaphore; @property (retain, nonatomic) NSError *error; - (id)init; - (void).cxx_destruct; - (void)onCallbackWithError:(id)a0; - (BOOL)waitAndReturnWithError:(id *)a0; @end