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export class TokenBucketLimiter {↵
  private tokens: number;↵
  private lastRefill = Date.now();↵
↵
  constructor(↵
    private readonly capacity = 100,↵
    private readonly refillRatePerSec = 100↵
  ) {↵
    this.tokens = capacity;↵
  }↵
↵
  public tryConsume(cost = 1): boolean {↵
    this.refill();↵
    if (this.tokens >= cost) {↵
      this.tokens -= cost;↵
      return true;↵
    }↵
    return false;↵
  }↵
↵
  private refill(): void {↵
    const now = Date.now();↵
    const elapsedSec = (now - this.lastRefill) / 1000;↵
    this.tokens = Math.min(↵
      this.capacity,↵
      this.tokens + elapsedSec * this.refillRatePerSec↵
    );↵
    this.lastRefill = now;↵
  }↵
}

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