Fixing 429 Rate Limit Errors

async function fetchWithBackoff(url: string, attempts = 5) {
  let delay = 500;

  for (let i = 0; i < attempts; i++) {
    const res = await fetch(url);

    if (res.status !== 429) {
      return res;
    }

    const retryAfter = Number(res.headers.get('Retry-After'));
    const waitMs = Number.isFinite(retryAfter) && retryAfter > 0
      ? retryAfter * 1000
      : delay + Math.floor(Math.random() * 200);

    await new Promise((resolve) => setTimeout(resolve, waitMs));
    delay *= 2;
  }

  throw new Error('Rate limit exceeded after retries');
}