code: function externalAlias(methodName) {
    return function _externalAliasMethod(routeName, ...args) {
      let externalRoute = getOwner(this)._getExternalRoute(routeName);
      let router = this._router || this.router;
      return router[methodName](externalRoute, ...args);
    };
  }
docs: /*
  Creates an aliased form of a method that properly resolves external routes.