JS - Wait for given function to return true before proceeding

example.js

import { waitFor } from './waitFor';

let unrelatedStuffValue = false;

async function test() {
  const result = await waitFor(() => unrelatedStuffValue);
  console.log('Result: ', result); // Result: true
}

async function unrelatedAsyncStuff() {
  await fetch('.'); // any async action
  unrelatedStuffValue = true;
}

unrelatedAsyncStuff();
test();

waitFor.js

export const waitFor = (func = () => {}) => {
	const RETRY_DELAY = 100;

	return new Promise(resolve => {
		const retrialFunction = () => {
			if (!func()) return setTimeout(retrialFunction, RETRY_DELAY);
			resolve(func());
		};
		retrialFunction();
	});
};