docs: function importerExpress(expressApp, options) {
      var importTo = '/';
      if (typeof options === 'object') {
          importTo = options.routePath || importTo;
      }
  
      importerSync(options, function (router, name) {
          if (name === 'index') expressApp.use(importTo, router);
          expressApp.use(path.join(importTo, name), router);
      });
  }