public ConfigInstallerInterface::installOptionalConfig(StorageInterface $storage = NULL, $dependency = [])
Installs optional configuration.
Optional configuration is only installed if:
\Drupal\Core\Config\StorageInterface: (optional) The configuration storage to search for optional configuration. If not provided, all enabled extension's optional configuration directories will be searched.
array $dependency: (optional) If set, ensures that the configuration being installed has this dependency. The format is dependency type as the key ('module', 'theme', or 'config') and the dependency name as the value ('book', 'bartik', 'views.view.frontpage').
public function installOptionalConfig(StorageInterface $storage = NULL, $dependency = []);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!ConfigInstallerInterface.php/function/ConfigInstallerInterface::installOptionalConfig/8.1.x