Method emitWithAck

packages/socket.io-client/lib/socket.ts:510–522

* Emits an event and waits for an acknowledgement * * @example * // without timeout * const response = await socket.emitWithAck("hello", "world"); * * // with a specific timeout * try { * const response = await socket.timeout(1000).emitWithAck("hello", "world"); * } catc

(
    ev: Ev,
    ...args: AllButLast<EventParams<EmitEvents, Ev>>
  )

   * @return a Promise that will be fulfilled when the server acknowledges the event
   */
  public emitWithAck<Ev extends EventNames<EmitEvents>>(
    ev: Ev,
    ...args: AllButLast<EventParams<EmitEvents, Ev>>
  ): Promise<FirstArg<Last<EventParams<EmitEvents, Ev>>>> {
    return new Promise((resolve, reject) => {
      const fn = (arg1, arg2) => {
        return arg1 ? reject(arg1) : resolve(arg2);
      };
      fn.withError = true;
      args.push(fn);
      this.emit(ev, ...(args as any[] as EventParams<EmitEvents, Ev>));
    });
  }

  /**
   * Add the packet to the queue.