code: public function load(array $configs, ContainerBuilder $container)
      {
          $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
          $loader->load('block.xml');
          $loader->load('twig.xml');
  
          if (\count($configs) > 1) {
              $initConfig = array_pop($configs);
              $configs = array_reverse($configs);
              $configs[] = $initConfig;
          }
  
          $configuration = $this->getConfiguration($configs, $container);
          $config = $this->processConfiguration($configuration, $configs);
  
          $container->setParameter('fxp_block.twig.resources', $config['block_themes']);
          $this->registerDoctrineConfiguration($config['doctrine'], $loader);
          $this->registerProfilerConfiguration($config['profiler'], $loader);
      }
docs: {@inheritdoc}