https://tech.mybuilder.com/handling-retries-and-back-off-attempts-with-javascript-promises/

promise-backoff.js

var pause = (duration) => new Promise(res => setTimeout(res, duration));

var exponentialBackoff = (func, attempts = 1, delay = 50) => {
  console.log('attempts', attempts)
  return func().catch(err => {
    console.log('error', err)
    if (attempts > 1) {
      console.log(`Retries left ${attempts - 1}`)
      console.log(`Next delay ${delay * 2}`)
      return pause(delay).then(() => exponentialBackoff(func, attempts - 1, delay * 2))
    }
    return Promise.reject(err)
  })
}

function sometimesFails() {
  var percentFail = 0.8;
  var passed = Math.random() >= 0.8;
  console.log('passed', passed)
  if (passed) {
      return Promise.resolve()
  }
  console.log('return reject')
  return Promise.reject()
}

var maxAttempts = 10

exponentialBackoff(sometimesFails, maxAttempts).then(() => {
  console.log('success!')
}).catch((e) => {
  console.log('never passed!')
})