@JsFunction
  interface PromiseExecutorCallbackFn<T extends @Nullable Object> {
    @JsFunction
    interface ResolveCallbackFn<T extends @Nullable Object> {
      void onInvoke(T value);
    }

    @JsFunction
    interface RejectCallbackFn {
      void onInvoke(Object error);
    }

    void onInvoke(ResolveCallbackFn<T> resolve, RejectCallbackFn reject);
  }

  public Promise(PromiseExecutorCallbackFn<T> executor) {}