DartDart_InitializeIsolateCallbackFunction typedef
        DartDart_InitializeIsolateCallbackFunction =
     bool Function(Pointer<Pointer<Void> >  child_isolate_data, Pointer<Pointer<Char> >  error)
    
    
    
Implementation
typedef DartDart_InitializeIsolateCallbackFunction = bool Function(
    ffi.Pointer<ffi.Pointer<ffi.Void>> child_isolate_data,
    ffi.Pointer<ffi.Pointer<ffi.Char>> error);