Invoke JavaScript Function with setInterval and return value using import and export in different files

I have 2 files in JavaScript (node). In the first file I have a function which is then exported inside of a setInterval() call because I want it to be self invoking every minute. The issue is when I try to export default my setInterval(method, 60000) and then import it into another file and console.log() I am getting the return value of the interval method itself rather than the value I want returned.

1st JS File

  const makeApiCall = async () => {
  const res = await fetch('https://jsonplaceholder.typicode.com/posts');

  const results = await res.json();

  return results;
};

export default setInterval(makeApiCall, 60000);

JS File 2

import makeIntervalCall from './file1.js';

console.log({ rezults: makeIntervalCall });

console log output

{                                                                                                                                                                      
  rezults: Timeout {
    _idleTimeout: 2000,
    _idlePrev: [TimersList],
    _idleNext: [TimersList],
    _idleStart: 2485,
    _onTimeout: [AsyncFunction: makeApiCall],
    _timerArgs: undefined,
    _repeat: 2000,
    _destroyed: false,
    [Symbol(refed)]: true,
    [Symbol(kHasPrimitive)]: false,
    [Symbol(asyncId)]: 43,
    [Symbol(triggerId)]: 0
  }
}

So when using the interval called function in another file it logs out the Timeout rather than the results. How do I extract the actual api results from this when importing into another file?

>Solution :

Export a function that accepts a listener function which you can pass to makeApiCall.

It’s also common in these scenarios to provide a remove or unsubscribe function to assist cleanup.

const makeApiCall = async (listener) => {
  const res = await fetch("https://jsonplaceholder.typicode.com/posts");
  if (!res.ok) {
    throw new Error(`${res.status}: ${res.statusText}`);
  }
  listener(await res.json());
};

export default (listener) => {
  const timer = setInterval(makeApiCall, 60000, listener);
  return () => {
    clearInterval(timer);
  };
};

And use it like this

import makeIntervalCall from "./file1.js";

const unsub = makeIntervalCall((results) => {
  console.log(results);
});

// and when you want the interval to stop
unsub();