documentation/framework_2_event_2_manager_interface_8php_source.html

 <?php
 namespace Magento\Framework\Event;

 interface ManagerInterface
 {
     public function dispatch($eventName, array $data = []);
 }
Magento\Framework\Event
Definition: Collection.php:12

$data
$data
Definition: attribute_set_with_image_attribute.php:16

Magento\Framework\Event\ManagerInterface
Definition: ManagerInterface.php:12

Magento\Framework\Event\ManagerInterface\dispatch
dispatch($eventName, array $data=[])