Auto-Retry Fetcher

Implement createFetcher(maxRetries, baseDelay) that returns an object with a fetch method that auto-retries on failure with exponential backoff and jitter.

Requirements

• fetch(asyncFn) — call asyncFn(). If it throws, retry up to maxRetries times.
• Delay between retries: baseDelay * 2^attempt + random jitter (0 to baseDelay).
• On success, return the result.
• If all retries are exhausted, throw the last error.
• The attempt counter starts at 0 for the first retry.

Example

const fetcher = createFetcher(3, 100);
const data = await fetcher.fetch(async () => {
  // might fail, will be retried up to 3 times
  return 'data';
});