diff -r 387345a14b3f -r b32c52c76977 qmlfrontend/engine_instance.h
--- a/qmlfrontend/engine_instance.h	Fri Jul 05 23:40:03 2019 +0300
+++ b/qmlfrontend/engine_instance.h	Sat Jul 06 00:31:54 2019 +0200
@@ -12,15 +12,6 @@
   Q_OBJECT
 
  public:
-  using SimpleEventType = Engine::SimpleEventType;
-  Q_ENUMS(SimpleEventType)
-  using LongEventType = Engine::LongEventType;
-  Q_ENUMS(LongEventType)
-  using LongEventState = Engine::LongEventState;
-  Q_ENUMS(LongEventState)
-  using PositionedEventType = Engine::PositionedEventType;
-  Q_ENUMS(PositionedEventType)
-
   explicit EngineInstance(const QString& libraryPath,
                           QObject* parent = nullptr);
   ~EngineInstance();
@@ -40,9 +31,11 @@
  public slots:
   void advance(quint32 ticks);
   void moveCamera(const QPoint& delta);
-  void simpleEvent(SimpleEventType event_type);
-  void longEvent(LongEventType event_type, LongEventState state);
-  void positionedEvent(PositionedEventType event_type, qint32 x, qint32 y);
+  void simpleEvent(Engine::SimpleEventType event_type);
+  void longEvent(Engine::LongEventType event_type,
+                 Engine::LongEventState state);
+  void positionedEvent(Engine::PositionedEventType event_type, qint32 x,
+                       qint32 y);
 
  private:
   Engine::EngineInstance* m_instance;
@@ -65,9 +58,4 @@
   bool m_isValid;
 };
 
-Q_DECLARE_METATYPE(EngineInstance::SimpleEventType)
-Q_DECLARE_METATYPE(EngineInstance::LongEventType)
-Q_DECLARE_METATYPE(EngineInstance::LongEventState)
-Q_DECLARE_METATYPE(EngineInstance::PositionedEventType)
-
 #endif  // ENGINEINSTANCE_H