Function cache

cache<F extends (...args: any[]) => any>(
func: F,
options?: { maxSize?: number; ttl?: number },
): Cached<F>
Caches the result of a function call by its arguments.

Returned function exposes .clear() and .delete(...args) for manual invalidation. Optional maxSize enables LRU eviction; optional ttl (ms) makes entries expire. Promises are unwrapped — only the resolved value is stored, so concurrent calls share one inflight Promise.
Type Parameters
- F extends (...args: any[]) => any
Parameters
- func: F
- Optionaloptions: { maxSize?: number; ttl?: number }
  - OptionalmaxSize?: number
    When set, evicts the least-recently-used entry once the cache exceeds this size.
  - Optionalttl?: number
    Time-to-live in milliseconds. Entries older than this are recomputed on read.
Returns Cached<F>
Example
```
const fetchUser = cache(
    (id: string) => fetch(`/users/${id}`).then(r => r.json()),
    { maxSize: 100, ttl: 60_000 },
)
fetchUser('1')          // network call
fetchUser('1')          // cached
fetchUser.delete('1')   // drop one entry
fetchUser.clear()       // drop all
```
- Defined in src/cache.ts:42