const fetchWithRetry = (userOptions) => {
  let abort = false;
  const options = {
    url: '',
    options: {},
    cancel: {},
    retries: 3,
    retryDelay: 1000,
    ...userOptions
  };

  // Add an abort to the cancel object.
  if(!cancel.abort) cancel.abort = () => { abort = true };

  // Abort or proceed?
  return abort ? Promise.reject('aborted') : fetch(options.url).then(response => {

      // Reject because of abort
    return abort ? Promise.reject('aborted')

      // Response is good
      : response.ok ? Promise.resolve(response.text())

      // Retries exceeded
      : !options.retries ? Promise.reject('retries exceeded')

      // Retry with one less retry
      : new Promise((resolve, reject){
          setTimeout(() => {

            // We use the returned promise's resolve and reject as
            // callback so that the nested call propagates backwards.
            fetchWithRetry({ ...options, retries: retries - 1 }).then(resolve, reject);
          }, options.retryDelay);

        });
  });
}