interface ContentEntityStorageInterface

interface ContentEntityStorageInterface extends EntityStorageInterface, TranslatableRevisionableStorageInterface {
    
    /**
     * Creates an entity with sample field values.
     *
     * @param string|bool $bundle
     *   (optional) The entity bundle.
     * @param array $values
     *   (optional) Any default values to use during generation.
     *
     * @return \Drupal\Core\Entity\FieldableEntityInterface
     *   A fieldable content entity.
     *
     * @throws \Drupal\Core\Entity\EntityStorageException
     *   Thrown if the bundle does not exist or was needed but not specified.
     */
    public function createWithSampleValues($bundle = FALSE, array $values = []);

}