Retry promise with incremental backoff in TypeScript

retry.ts

export const retry = (fn: () => Promise<any>, timeout = 1000, retries = 5) =>
  new Promise((resolve, reject) => {
    fn()
      .then(resolve)
      .catch(() => {
        setTimeout(() => {
          const retriesLeft = retries - 1;
          if (retries < 0) {
            return reject('maximum retries exceeded');
          }
          retry(fn, timeout * 2, retriesLeft).then(resolve);
        }, timeout);
      });
  });

https://gist.github.com/briancavalier/842626