simple-fetch-retry.js

export const retryFetch = (url, options, retryConf = {maxRetries: 2, delay: 200}) => {
  return new Promise((resolve, reject) => {
    const wrappedFetch = ({maxRetries, delay}) => {
      fetch(url, options)
        .then(response => {
          const status = response.status
          if (status >= 500) {
            if (maxRetries > 0) {
              retry(maxRetries, delay)
            } else {
              reject(new ServerRequestError(response))
            }
          } else {
            resolve(response)
          }
        })
        .catch((error) => {
          if (maxRetries > 0) {
            retry(maxRetries, delay)
          } else {
            reject(error)
          }
        })
    }

    const retry = (max, delay) => {
      setTimeout(() => {
        wrappedFetch({ maxRetries: --max, delay: delay * 2 })
      }, delay)
    }

    wrappedFetch(retryConf)
  })
}