alvarocastro/volatile-map

const DEFAULT_TTL = 600000; // 10 minutes

class VolatileMap extends Map {
    constructor (ttl) {
        super();
        this.ttl = ttl ?? DEFAULT_TTL;
        this.schedules = new Map();
    }

    delete (key) {
        super.delete(key);
        clearTimeout(this.schedules.get(key));
        this.schedules.delete(key);
    }

    set (key, value, ttl = this.ttl) {
        super.set(key, value);
        if (this.schedules.has(key)) {
            clearTimeout(this.schedules.get(key));
        }

        const schedule = setTimeout(() => {
            super.delete(key);
        }, ttl);
        this.schedules.set(key, schedule);
    }

    get (key) {
        return super.get(key);
    }
}

export default VolatileMap;