<?phpnamespace Webkul\UVDesk\ExtensionFrameworkBundle\DependencyInjection;use Symfony\Component\Config\Definition\Builder\TreeBuilder;use Symfony\Component\Config\Definition\ConfigurationInterface;class Configuration implements ConfigurationInterface{ public function getConfigTreeBuilder() { $treeBuilder = new TreeBuilder(); $treeBuilder->root('uvdesk_extensions') ->children() ->node('dir', 'scalar')->defaultValue('%kernel.project_dir%/apps')->end() ->end(); return $treeBuilder; }}