asyncRetry.js

const getRandomBool = () => Math.random() >= 0.5

const getJitterMultiplier = (min: number, max: number): number => {
  const percent = (Math.random() * (max - min) + min) / 100
  return getRandomBool() ? 1 + percent : 1 - percent
}

const asyncRetry = async (fn, opts = {}) => {
  const defaultOpts = { retries: 5, interval: 100, exponential: false, jitter: false }
  opts = { ...defaultOpts, ...opts }
  try {
    const val = await fn(opts.retries)
    return val
  } catch (error) {
    if (opts.retries) {
      await new Promise(r => setTimeout(r, opts.interval))
      let newInterval = opts.interval
      if (opts.exponential) {
        newInterval *= 2
      }
      if (opts.jitter) {
        newInterval *= getJitterMultiplier(0, 10)
      }
      return asyncRetry(fn, {
        retries: opts.retries - 1,
        interval: newInterval,
        exponential: opts.exponential,
      })
    } else throw error
  }
}

// Usage...
const widgets = await asyncRetry(
  async attemptsLeft => {
    const widgets = await fetch('www.example.com/widgets')

    if (widgets.length === 0) {
      console.log(`${attemptsLeft} attempts left`)
      throw Error('Widgets not yet available')
    }

    return widgets
  },
  { retries: 30, interval: 10000, exponential: false, jitter: false }
)