ChatEvent.php

См. документацию.

<?php
 
namespace Bitrix\Im\V2\Chat\ExternalChat\Event;
 
use Bitrix\Im\V2\Chat\ExternalChat;
use Bitrix\Im\V2\Chat\ExternalChat\Event;
 
abstract class ChatEvent extends Event
{
    public function __construct(ExternalChat $chat, array $parameters = [])
    {
        $parameters['chat'] = $chat;
 
        parent::__construct($chat->getEntityType(), $parameters);
    }
 
    public function getChat(): ExternalChat
    {
        return $this->parameters['chat'];
    }
}