Handling loading Moat Yield Intelligence with a promise and timeout

loadMoatYield.js

export const MOAT_TIMEOUT = 1000;

const handleMoatYieldReady = resolve => {
  // being extra careful that this API is available because
  // we shouldn't trust Moat works as expected...
  if (!window.moatPrebidApi) {
    return resolve({ moatYieldUnavailable: true });
  }

  const { setMoatTargetingForAllSlots } = window.moatPrebidApi;

  if (setMoatTargetingForAllSlots) {
    setMoatTargetingForAllSlots(); // set targeting for MOAT
  }

  return resolve({ moatYieldLoaded: true });
};

/*
  This function returns a Promise and
  can resolve in two ways:

  1. if `window.moatYieldReady` is called by Moat
  2. if Moat doesn't load in time (MOAT_TIMEOUT passes)

  If either is called the other is cancelled out.

  We can ensure if Moat isn't loaded in MOAT_TIMEOUT,
  our adverts are still called.
*/
const loadMoatYield = () => {
  return new Promise(resolve => {
    const timeoutId = setTimeout(() => {
      resolve({ moatYieldTimedOut: true });
    }, MOAT_TIMEOUT);

    window.moatYieldReady = () => {
      clearTimeout(timeoutId); // reset timeout
      handleMoatYieldReady(resolve);
    };
  });
};

export default loadMoatYield;