不确定为什么我会遇到此问题。我正在按照 react-native 教程操作，但遇到了此错误：

TransformFile(filePath, transformOptions) {
    var _this3 = this;

    return _asyncToGenerator(function*() {
      // We need to be sure that the DependencyGraph has been initialized.
      // TODO: Remove this ugly hack!
      yield _this3._depGraphPromise;
      return _this3._transformer.transformFile(filePath, transformOptions);
    })();