SdlTimerCallback typedef
        SdlTimerCallback =
     Uint32 Function(Pointer<NativeType>  userdata, Uint32 timerId, Uint32 interval)
    
    
    
Implementation
typedef SdlTimerCallback =
    Uint32 Function(
      Pointer<NativeType> userdata,
      Uint32 timerId,
      Uint32 interval,
    );