src/lib/cached.ts — radicle-desktop

rad:z4D5UCArafTzTQpDZNQRuqswh3ury

Radicle desktop app

.. router appearance.svelte.ts auth.svelte.ts avatar.ts cached.ts checkRadicleCLI.svelte.ts draftReviewStorage.ts emojis.ts events.ts interval.ts invoke.ts issueCounts.svelte.ts markdown.ts modal.ts mutexExecutor.ts notification.ts notificationCount.svelte.ts patchCounts.svelte.ts portal.ts roles.ts router.ts sleep.ts startup.svelte.ts syntax.ts updateChecker.svelte.ts useLocalStorage.svelte.ts utils.ts

import { LRUCache } from "lru-cache";

export function cached<Args extends unknown[], V>(
  f: (...args: Args) => Promise<V>,
  makeKey: (...args: Args) => string,
  options?: LRUCache.Options<string, { promise: Promise<V> }, unknown>,
): (...args: Args) => Promise<V> {
  const cache = new LRUCache(options || { max: 500 });
  return function (...args: Args): Promise<V> {
    const key = makeKey(...args);
    const hit = cache.get(key);
    if (hit !== undefined) return hit.promise;

    const promise = f(...args);
    // Evict on rejection so the next caller can retry with a fresh request.
    promise.catch(() => {
      cache.delete(key);
    });
    cache.set(key, { promise });
    return promise;
  };
}