public function prepend(ContainerBuilder $container)
    {
        $configs = $container->getExtensionConfig($this->getAlias());
        $config = $this->processConfiguration($this->getConfiguration($configs, $container), $configs);

        foreach ($this->service_sources as $service_source) {
            $result = $service_source->prepend($container, $config);
            if (null !== $result) {
                $container->prependExtensionConfig($this->getAlias(), $result);
            }
        }
    }
public function prepend(ContainerBuilder $container)
    {
        $configs = $container->getExtensionConfig($this->getAlias());
        $config = $this->processConfiguration($this->getConfiguration($configs, $container), $configs);

        foreach ($this->service_sources as $service_source) {
            $result = $service_source->prepend($container, $config);
            if (null !== $result) {
                $container->prependExtensionConfig($this->getAlias(), $result);
            }
        }
    }
{@inheritdoc}