@class NSHashTable, _MXExtensionProvider, NSObject; @protocol OS_dispatch_queue; @interface _MXExtensionDispatchCenter : NSObject { NSObject<OS_dispatch_queue> *_lock; NSHashTable *_handlers; } @property (readonly, weak, nonatomic) _MXExtensionProvider *extensionProvider; - (id)initWithExtensionProvider:(id)a0; - (void).cxx_destruct; - (void)removeExtensionUpdateHandler:(id)a0; - (void)dispatchExtensions:(id)a0 error:(id)a1; - (id)addExtensionsUpdateHandler:(id /* block */)a0; @end