Javascript Recursive Asynchronous Retry Function

asyncRetry.js

/**
 * Retries a async function recursively n times.
 *
 * @param {function} fn
 * @param {Number} [retries=3]
 * @returns {Promise}
 */
function retry(fn, retries=3, err=null) {
  if (retries === 0) {
    return Promise.reject(err);
  }
  return fn().catch(err => {
      return retry(fn, (retries - 1), err);
    });
}