TypeError, is not a function error in NodejS

Question

I have a class that contains few functions, putting one of then below,

const _ = require("lodash");
const ObjectId = require("mongoose").Types.ObjectId;
const mockLookUps = require(“../../data”).mockLookUps;

class XYZ {
   // ...... Other functions
   async getData() {
    return Promise.resolve(mockLookUps); // JSON Object
  }
}

module.exports = XYZ;

if I import that in other class like below,

const x = await XYZ.getData();

It is throwing me some is not a function error like this,

XYZ.getData is not a function

What is the mistake I'm making?

Does this answer your question? Class vs. static method in JavaScript — Amin Taghikhani
– Amin Taghikhani, Commented Sep 30, 2021 at 6:55
Please read Under what circumstances may I add “urgent” or other similar phrases to my question, in order to obtain faster answers? - the summary is that this is not an ideal way to address volunteers, and is probably counterproductive to obtaining answers. Please refrain from adding this to your questions. — halfer
– halfer, Commented Oct 2, 2021 at 9:00
By the way, no need for Promise.resolve since your method is async anyway. — CherryDT
– CherryDT, Commented Oct 2, 2021 at 9:04

axel · Accepted Answer · 2021-09-30 06:51:44Z

1

const xyz = new XYZ()
const data = await xyz.getData()

Could work

answered Sep 30, 2021 at 6:51

axel

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Comments

Ihar Dziamidau · Accepted Answer · 2021-09-30 06:47:36Z

0

1. You have to create a class instance first to call instance methods.

try this:

const xyz = new XYZ();
const result = await xyz.getData();

2. For your case try to make it static:

class XYZ {
   // ...... Other functions
   static async getData() {
    return Promise.resolve(mockLookUps); // JSON Object
  }
}

module.exports = XYZ;

and then you can use so:

const x = await XYZ.getData();

answered Sep 30, 2021 at 6:47

Ihar Dziamidau

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