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cache ​

Problem ​

You need an in-memory TTL cache with identity keys and deduplicated async loads.

Solution ​

ts
import { cache } from '@vielzeug/arsenal/cache';

const users = cache<string, User>({ ttlMs: 60_000 });
const user = await users.getOrLoad('user:1', () => fetchUser(1));

users.delete('user:1');

Pitfalls ​

  • Cache is in-memory only. Use Vault for persistence.
  • TTL expiry is lazy: reads remove expired entries. The size getter does not evict.
  • Equal object literals are different keys; native Map identity applies.