ewancroft.uk
a Linkat frontend.
1/**
2 * Caches data in localStorage with a specified expiry time.
3 * @param key The key to store the data under.
4 * @param data The data to store.
5 * @param ttl The time-to-live for the cache in milliseconds (default: 1 hour).
6 */
7export function setCache<T>(key: string, data: T, ttl: number = 3600000): void {
8 if (typeof window === 'undefined') {
9 return; // Don't cache on the server
10 }
11 const now = new Date().getTime();
12 const item = {
13 data: data,
14 expiry: now + ttl,
15 };
16 localStorage.setItem(key, JSON.stringify(item));
17}
18
19/**
20 * Retrieves data from localStorage if it's not expired.
21 * @param key The key to retrieve the data from.
22 * @returns The cached data, or null if expired or not found.
23 */
24export function getCache<T>(key: string): T | null {
25 if (typeof window === 'undefined') {
26 return null; // No cache on the server
27 }
28 const itemStr = localStorage.getItem(key);
29 if (!itemStr) {
30 return null;
31 }
32 const item = JSON.parse(itemStr);
33 const now = new Date().getTime();
34 if (now > item.expiry) {
35 localStorage.removeItem(key);
36 return null;
37 }
38 return item.data;
39}