export async function fetchWithRetry(
  url: string,
  tries = 3,
  sleep: (ms: number) => Promise<void> = (ms) =>
    new Promise((r) => setTimeout(r, ms))
) {
  for (let i = 1; i <= tries; i++) {
    try {
      const res = await fetch(url);
      if (!res.ok) {
        throw new Error(`HTTP ${res.status}: ${res.statusText}`);
      }
      return await res.json();
    } catch (error) {
      if (i === tries) {
        throw new Error(
          `Failed after ${tries} attempts: ${error instanceof Error ? error.message : "Unknown error"}`
        );
      }
      await sleep(500 * i); // exponential backoff
    }
  }
}