Function cacheWithTTL

backend/src/utils/ttl-cache.ts:13–27

(
  ttlMs: number,
  fn: () => Promise<T>,
)

 * @returns {() => Promise<T | undefined>}
 */
export function cacheWithTTL<T>(
  ttlMs: number,
  fn: () => Promise<T>,
): () => Promise<T | undefined> {
  let lastFetchTime = 0;
  let cache: T | undefined;

  return async () => {
    if (lastFetchTime < Date.now() - ttlMs) {
      lastFetchTime = Date.now();
      cache = await fn();
    }
    return cache;
  };
}