// Add beacon support for more reliable delivery on page unload
window.addEventListener("beforeunload", async (e) => {
  e.stopImmediatePropagation();
  if (navigator.sendBeacon) {
    const data = this.queue.map(item => item.message);
    navigator.sendBeacon(this.url, JSON.stringify(data));
  } else {
    await this.flush();
  }
});

   import { createHash } from 'crypto';

   private hashPayload(payload: any): string {
     return createHash('sha256').update(JSON.stringify(payload)).digest('hex');
   }

 private payloadHashes: Set<string> = new Set();

   private checkDuplicate(newMessage: RequestEvent): boolean {
     const hash = this.hashPayload(newMessage);
     if (this.payloadHashes.has(hash)) {
       return true;
     }
     this.payloadHashes.add(hash);
     return false;
   }