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vendor/symfony/dependency-injection/Extension/ConfigurationExtensionInterface.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Extension;
+
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * ConfigurationExtensionInterface is the interface implemented by container extension classes.
+ *
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+interface ConfigurationExtensionInterface
+{
+    /**
+     * Returns extension configuration.
+     *
+     * @return ConfigurationInterface|null The configuration or null
+     */
+    public function getConfiguration(array $config, ContainerBuilder $container);
+}