1class RateLimiter {
2    #queue = [];
3    #windowSize;
4    #maxRequests;
5
6    constructor(windowSize, maxRequests) {
7        this.#windowSize = windowSize;
8        this.#maxRequests = maxRequests;
9    }
10
11    async checkLimit() {
12        const now = Date.now();
13        this.#cleanOldRequests(now);
14
15        if (this.#queue.length >= this.#maxRequests) {
16            const oldestRequest = this.#queue[0];
17            const waitTime = oldestRequest + this.#windowSize - now;
18            if (waitTime > 0) {
19                await new Promise(resolve => setTimeout(resolve, waitTime));
20                return this.checkLimit();
21            }
22        }
23
24        this.#queue.push(now);
25        return true;
26    }
27
28    #cleanOldRequests(now) {
29        const threshold = now - this.#windowSize;
30        while (this.#queue.length &amp;&amp; this.#queue[0] <= threshold) {
31            this.#queue.shift();
32        }
33    }
34}
35
36const limiter = new RateLimiter(5000, 3);
37
38async function sendMessage(msg) {
39    await limiter.checkLimit();
40    console.log(`Sent: ${msg} at ${Date.now()}`);
41}
42
43// Testing the rate limiter
44(async () => {
45    for (let i = 1; i <= 5; i++) {
46        sendMessage(`Message ${i}`).catch(console.error);
47    }
48})();