+class Configuration implements ConfigurationInterface {
+       /**
+        * {@inheritdoc}
+        */
+       public function getConfigTreeBuilder(): TreeBuilder {
+               //Get TreeBuilder object
+               $treeBuilder = new TreeBuilder($alias = RapsysPackBundle::getAlias());
+
+               //Get ExecutableFinder object
+               $finder = new ExecutableFinder();
+
+               //The bundle default values
+               $defaults = [
+                       'filters' => [
+                               'css' => [
+                                       0 => [
+                                               'class' => 'Rapsys\PackBundle\Filter\CPackFilter',
+                                               'args' => [
+                                                       $finder->find('cpack', '/usr/local/bin/cpack'),
+                                                       'minify'
+                                               ]
+                                       ]
+                               ],
+                               'img' => [
+                                       0 => [
+                                               'class' => 'Rapsys\PackBundle\Filter\IPackFilter',
+                                               'args' => []
+                                       ]
+                               ],
+                               'js' => [
+                                       0 => [
+                                               'class' => 'Rapsys\PackBundle\Filter\JPackFilter',
+                                               'args' => [
+                                                       $finder->find('jpack', '/usr/local/bin/jpack'),
+                                                       'best'
+                                               ]
+                                       ]
+                               ]
+                       ],
+                       #TODO: migrate to public.path, public.url and router->generateUrl ?
+                       #XXX: that would means dropping the PathPackage stuff and use static route like rapsyspack_facebook
+                       'output' => [
+                               'css' => '@RapsysPack/css/*.pack.css',
+                               'img' => '@RapsysPack/img/*.pack.jpg',
+                               'js' =>  '@RapsysPack/js/*.pack.js'
+                       ],
+                       'path' => dirname(__DIR__).'/Resources/public',
+                       'token' => 'asset_url'
+               ];
+
+               /**
+                * Defines parameters allowed to configure the bundle
+                *
+                * @link https://github.com/symfony/symfony/blob/master/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+                * @link http://symfony.com/doc/current/components/config/definition.html
+                * @link https://github.com/symfony/assetic-bundle/blob/master/DependencyInjection/Configuration.php#L63
+                *
+                * @see bin/console config:dump-reference rapsyspack to dump default config
+                * @see bin/console debug:config rapsyspack to dump config
+                */
+               $treeBuilder
+                       //Parameters
+                       ->getRootNode()
+                               ->addDefaultsIfNotSet()
+                               ->children()
+                                       ->arrayNode('filters')
+                                               ->addDefaultsIfNotSet()
+                                               ->children()
+                                                       ->arrayNode('css')
+                                                               /**
+                                                                * Undocumented
+                                                                *
+                                                                * @see Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php +513
+                                                                */
+                                                               ->addDefaultChildrenIfNoneSet()
+                                                               ->arrayPrototype()
+                                                                       ->children()
+                                                                               ->scalarNode('class')
+                                                                                       ->isRequired()
+                                                                                       ->cannotBeEmpty()
+                                                                                       ->defaultValue($defaults['filters']['css'][0]['class'])
+                                                                               ->end()
+                                                                               ->arrayNode('args')
+                                                                                       //->isRequired()
+                                                                                       ->treatNullLike([])
+                                                                                       ->defaultValue($defaults['filters']['css'][0]['args'])
+                                                                                       ->scalarPrototype()->end()
+                                                                               ->end()
+                                                                       ->end()
+                                                               ->end()
+                                                       ->end()
+                                                       ->arrayNode('img')
+                                                               /**
+                                                                * Undocumented
+                                                                *
+                                                                * @see Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php +513
+                                                                */
+                                                               ->addDefaultChildrenIfNoneSet()
+                                                               ->arrayPrototype()
+                                                                       ->children()
+                                                                               ->scalarNode('class')
+                                                                                       ->isRequired()
+                                                                                       ->cannotBeEmpty()
+                                                                                       ->defaultValue($defaults['filters']['img'][0]['class'])
+                                                                               ->end()
+                                                                               ->arrayNode('args')
+                                                                                       ->treatNullLike([])
+                                                                                       ->defaultValue($defaults['filters']['img'][0]['args'])
+                                                                                       ->scalarPrototype()->end()
+                                                                               ->end()
+                                                                       ->end()
+                                                               ->end()
+                                                       ->end()
+                                                       ->arrayNode('js')
+                                                               /**
+                                                                * Undocumented
+                                                                *
+                                                                * @see Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php +513
+                                                                */
+                                                               ->addDefaultChildrenIfNoneSet()
+                                                               ->arrayPrototype()
+                                                                       ->children()
+                                                                               ->scalarNode('class')
+                                                                                       ->isRequired()
+                                                                                       ->cannotBeEmpty()
+                                                                                       ->defaultValue($defaults['filters']['js'][0]['class'])
+                                                                               ->end()
+                                                                               ->arrayNode('args')
+                                                                                       ->treatNullLike([])
+                                                                                       ->defaultValue($defaults['filters']['js'][0]['args'])
+                                                                                       ->scalarPrototype()->end()
+                                                                               ->end()
+                                                                       ->end()
+                                                               ->end()
+                                                       ->end()
+                                               ->end()
+                                       ->end()
+                                       ->arrayNode('output')
+                                               ->addDefaultsIfNotSet()
+                                               ->children()
+                                                       ->scalarNode('css')->cannotBeEmpty()->defaultValue($defaults['output']['css'])->end()
+                                                       ->scalarNode('img')->cannotBeEmpty()->defaultValue($defaults['output']['img'])->end()
+                                                       ->scalarNode('js')->cannotBeEmpty()->defaultValue($defaults['output']['js'])->end()
+                                               ->end()
+                                       ->end()
+                                       ->scalarNode('path')->cannotBeEmpty()->defaultValue($defaults['path'])->end()
+                                       ->scalarNode('token')->cannotBeEmpty()->defaultValue($defaults['token'])->end()
+                               ->end()
+                       ->end();
+
+               return $treeBuilder;
+       }