Resources and guides.

export function useDeduplicatedQuery<T>(url: string, ttlMs = 30000) {
  const controller = useRef<AbortController | null>(null);

  return useCallback(async () => {
    controller.current?.abort();
    controller.current = new AbortController();

    const cached = cache.get(url);
    if (cached && Date.now() - cached.timestamp < ttlMs) {
      return cached.data as T;
    }

    const res = await fetch(url, { signal: controller.current.signal });
    const data = await res.json();
    cache.set(url, { data, timestamp: Date.now() });
    return data as T;
  }, [url, ttlMs]);
}