Wait for function to return true uses promise for async / await

wait.js

/**************************************
 * Wait for function to return true, default 50ms for 100 attempts (5s)
 **************************************/
export const wait = (func, del = 50, lim = 100) => new Promise((resolve, reject) => {
  let attempt = 0
  const test = () => {
    if (func()) resolve()
    else if (attempt < lim) setTimeout(test, del)
    else reject("ran out of attempts")
    console.log('wait attempt', attempt)
    attempt++
  }
  test()
})