<?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;    }}