fetchRetry

const fetchRetry = async (url, opts) {
  let retryFor = 4
  let error = "Something went wrong"
  const f = async () => {
    try {
      const resp = await fetch(url, opts)
      return [,resp.json()]
    } catch (e) {
      return [e]
    }
  }
  while(--retryFor) { // 3 times retry
    const [err, res] = f()
    if(res) return res
    console.log('Error')
    console.log(e)
    console.log('Will retry in 30 sec')
    error = err
    await new Promise(resolve => setTimeout(resolve, 30000)) //sleep for 30 sec
  }
   throw new Error(error)
}