The name of the event triggered when an existing entity type is deleted.
This event allows modules to react whenever an existing entity type is deleted. The event listener method receives a \Drupal\Core\Entity\EntityTypeEvent instance.
\Drupal\Core\Entity\EntityTypeEvent
\Drupal\Core\Entity\EntityManager::onEntityTypeDelete()
\Drupal\Core\Entity\EntityTypeEventSubscriberTrait
\Drupal\views\EventSubscriber\ViewsEntitySchemaSubscriber::onEntityTypeDelete()
const DELETE = 'entity_type.definition.delete';
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityTypeEvents.php/constant/EntityTypeEvents::DELETE/8.1.x