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