Function onError

06.Router/basic/js/vue-router.js:1549–1555

(err)

      // handle errors
      var onError = function onError(err) {
        postActivate ? next() : abort();
        if (err && !transition.router._suppress) {
          warn$1('Uncaught error during transition: ');
          throw err instanceof Error ? err : new Error(err);
        }
      };

      // since promise swallows errors, we have to
      // throw it in the next tick...