Angular Writable Signals

chat-room.component.ts

export class ChatRoomComponent implements OnInit {
  onlineUsersCount: WritableSignal<number> = signal(0)

  ngOnInit() {
    // Update count via setter
    app.events.on('chat.room.connected', () => {
      this.onlineUsersCount.set(this.onlineUsersCount() + 1);
    });
    
    // Update count via callback
    app.events.on('chat.room.connected', () => {
      this.onlineUsersCount.update(value => value + 1);
    })
  }
}