JS/TS Implementation of RAM caching with efficient expires

cacheClientWithExpire.ts

export type CacheStorage = {
  set: (key: string, value: string) => Promise<boolean>;
  get: (key: string) => Promise<string | null>;
};

type CacheValue = { value: string; expireTime: number }

export const getRamCacheClient = () => {
  const cache: Record<string, CacheValue> = {};
  return {
    async set(key, value) {
      cache[key] = {
        value,
        expireTime: Date.now() + DEFAULT_EXPIRE_TIME * 1000,
      };
      return true;
    },
    async get(key) {
      const isCached = !!cache[key];
      if (!isCached) return null;

      const isExpired = cache[key].expireTime < Date.now();
      if (isExpired) return null;

      return cache[key].value;
    },
  } as CacheStorage;
};