DartDart_OnNewCodeCallbackFunction typedef
        DartDart_OnNewCodeCallbackFunction =
     void Function(Pointer<Dart_CodeObserver>  observer, Pointer<Char>  name, int base, int size)
    
    
    
Implementation
typedef DartDart_OnNewCodeCallbackFunction = void Function(
    ffi.Pointer<Dart_CodeObserver> observer,
    ffi.Pointer<ffi.Char> name,
    int base,
    int size);