Rate Limiter

class RateLimiter {
  constructor(maxTokens, refillRate) {
    this.maxTokens = maxTokens;
    this.tokens = maxTokens;
    this.refillRate = refillRate;
    this.lastRefill = Date.now();
  }
  
  consume(tokens = 1) {
    this.refill();
    
    if (this.tokens >= tokens) {
      this.tokens -= tokens;
      return true;
    }
    
    return false;
  }
  
  refill() {
    const now = Date.now();
    const timePassed = (now - this.lastRefill) / 1000;
    const tokensToAdd = Math.floor(timePassed * this.refillRate);
    
    this.tokens = Math.min(this.maxTokens, this.tokens + tokensToAdd);
    this.lastRefill = now;
  }
}