| Extension | Provides useful features shared by many extensions. |
| ConfigurationExtensionInterface | ConfigurationExtensionInterface is the interface implemented by container extension classes. |
| ExtensionInterface | ExtensionInterface is the interface implemented by container extension classes. |
| PrependExtensionInterface |
© 2004–2017 Fabien Potencier
Licensed under the MIT License.
https://api.symfony.com/4.1/Symfony/Component/DependencyInjection/Extension.html