page helpers for async waiting

asyncHelpers.js

const sleep = time => new Promise(resolve => {
  setTimeout(() => resolve(), time)
})

const waitUntilHidden = async (selector, timeout = 5000) => {
  const endTime = Date.now() + timeout
  while (document.querySelectorAll(selector).length && Date.now() < endTime) {
    await sleep(100)
  }
}

const waitUntil = async (selector, timeout = 5000) => {
  const endTime = Date.now() + timeout
  while (!document.querySelectorAll(selector).length && Date.now() < endTime) {
    await sleep(100)
  }
}