retry.js

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

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

const retry = (self, fn, args, retries, delay = 500, factor = 2) =>
  fn.apply(self, args).catch(err => retries > 1
    ? pause(delay).then(() => retry(self, fn, args, retries - 1, delay * factor, factor))
    : Promise.reject(err));

module.exports = retry;