Sleep fetch function

sleep-fetch.js

/**
 * Returns a fetch request after a defined timeout
 *
 * @param {String} url The url that you’re fetching
 * @param {Object} options={} Fetch API parameters
 * @param {Number} timeout=window.sleepFetchTimeout||1000 You can completely override the timeout globally with window.sleepFetchTimeout
 * @returns {Promise}
 */
const sleepFetch = (url, options = {}, timeout = window.sleepFetchTimeout || 0) => {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve(fetch(url, options));
    }, timeout);
  });
};