php-flasher/DependencyInjection/FlasherExtension.php

<?php

namespace Flasher\Symfony\DependencyInjection;

use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Loader;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;

final class FlasherExtension extends Extension
{
    /**
     * {@inheritdoc}
     *
     * @throws \Exception
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('config.yaml');

        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $notifyConfig = $container->getDefinition('flasher.config');
        $notifyConfig->replaceArgument(0, $config);
    }
}