* @return \Drupal\Core\Entity\EntityStorageInterface
* A storage instance.
*
+ * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
+ * Thrown if the entity type doesn't exist.
* @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
+ * Thrown if the storage handler couldn't be loaded.
*/
public function getStorage($entity_type);