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export class Cache {
    private cache = new Map();
    set(key: string, value: unknown, ttl?: number) {        const data = this.cache.get(key) || {};        data.value = value;        clearTimeout(data.timeout);
        if (ttl) {            data.timeout = setTimeout(() => this.delete(key), ttl);            data.expire = Date.now() + ttl * 1000;        }        this.cache.set(key, data);    }
    ttl(key: string, ttl: number) {        const data = this.cache.get(key)        if (data) {            clearTimeout(data.timeout);            data.timeout = setTimeout(() => this.delete(key), ttl);            data.expire = Date.now() + ttl * 1000;            return true;        }        return false;    }
    get(key: string) {        const data = this.cache.get(key);        if (data) {            if (!data.expire || data.expire > Date.now()) {                return data.value;            }            this.delete(key);        }        return null;    }
    delete(key: string) {        const data = this.cache.get(key);        if (data) {            if (data.expire) clearTimeout(data.timeout);            return this.cache.delete(key);        }        return false;    }
}