simple promise retry

function retry(fn, retriesLeft = 5, interval = 1000) {
  return new Promise((resolve, reject) => {
    fn()
      .then(resolve)
      .catch(error => {
        if (retriesLeft === 1) {
          // reject('maximum retries exceeded');
          reject(error);
          return;
        }
        setTimeout(() => {
          // Passing on "reject" is the important part
          retry(fn, retriesLeft - 1, interval).then(resolve, reject);
        }, interval);
      });
  });
}
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