Extension sub-directory containing optional configuration for installation.
const CONFIG_OPTIONAL_DIRECTORY = 'config/optional';
© 2001–2016 by the original authors
Licensed under the GNU General Public License, version 2 and later.
Drupal is a registered trademark of Dries Buytaert.
https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!InstallStorage.php/constant/InstallStorage::CONFIG_OPTIONAL_DIRECTORY/8.1.x