N98\Magento\Command\Developer\Module\UpdateCommand::addEvent PHP Метод

    protected function addEvent(\SimpleXMLElement $simpleXml, $area, $event)
    {
        $areaNode = $simpleXml->{$area} ? $simpleXml->{$area} : $simpleXml->addChild($area);
        $eventsNode = $areaNode->events ? $areaNode->events : $areaNode->addChild('events');
        $this->removeChildNodeIfNotNull($eventsNode, $event);
        $eventNode = $eventsNode->addChild($event);
        $observersNode = $eventNode->addChild('observers');
        $eventObserverNode = $observersNode->addChild($this->configNodes['event_observer']);
        $eventObserverNode->addChild('class', $this->configNodes['event_observer_class']);
        $eventObserverNode->addChild('method', $this->configNodes['event_observer_method']);
    }