interface SelectionWithAutocreateInterface

interface SelectionWithAutocreateInterface {
    
    /**
     * Creates a new entity object that can be used as a valid reference.
     *
     * @param string $entity_type_id
     *   The entity type ID.
     * @param string $bundle
     *   The bundle name.
     * @param string $label
     *   The entity label.
     * @param int $uid
     *   The entity owner ID, if the entity type supports it.
     *
     * @return \Drupal\Core\Entity\EntityInterface
     *   An unsaved entity object.
     */
    public function createNewEntity($entity_type_id, $bundle, $label, $uid);
    
    /**
     * Validates which newly created entities can be referenced.
     *
     * This method should replicate the logic implemented by
     * \Drupal\Core\Entity\EntityReferenceSelection\SelectionInterface::validateReferenceableEntities(),
     * but applied to newly created entities that have not been saved yet.
     *
     * @param \Drupal\Core\Entity\EntityInterface[] $entities
     *   An array of entities to check.
     *
     * @return \Drupal\Core\Entity\EntityInterface[]
     *   The incoming $entities parameter, filtered for valid entities. Array keys
     *   are preserved.
     */
    public function validateReferenceableNewEntities(array $entities);

}