JavaScript How to return Success data after update in firebase return success data ajax jquery,return success data,return success

I tried to return data after update in firebase but it is displaying as undefined

    test().then((res) => {
        alert(res);
      });

    test() {
    var fredNameRef = new Firebase('https://docs-examples.firebaseio.com/samplechat/users/fred/name');

    var onComplete = function(error) {
      if (error) {
        return error;
      } else {
        return "success";
      }
    };
    fredNameRef.update({ first: 'Wilma', last: 'Flintstone' }, onComplete);
    }
Answer:1

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