const contentLoaded = async () => new Promise((resolve) => {
  window.addEventListener('DOMContentLoaded', resolve);
});

const mediaLoaded = async () => new Promise((resolve) => {
  window.addEventListener('load', resolve);
});

const minDelay = async () =>
  new Promise(resolve => setTimeout(resolve, 500));

const maxDelay = async () =>
  new Promise(resolve => setTimeout(resolve, 1500));

const hidePreloader = () => {};

const delay = async () => { throw new Error('Not implemeted'); }

delay().then(() => hidePreloader());