[DependencyInjection] Revert native return types on ExtensionInterface et al.

Author: nicolas-grekas

Extension/ConfigurationExtensionInterface.php

@@ -23,6 +23,8 @@ interface ConfigurationExtensionInterface
 {
     /**
      * Returns extension configuration.
+     *
+     * @return ConfigurationInterface|null
      */
-    public function getConfiguration(array $config, ContainerBuilder $container): ?ConfigurationInterface;
+    public function getConfiguration(array $config, ContainerBuilder $container);
 }

Extension/Extension.php

@@ -28,12 +28,18 @@ abstract class Extension implements ExtensionInterface, ConfigurationExtensionIn
 {
     private array $processedConfigs = [];
 
-    public function getXsdValidationBasePath(): string|false
+    /**
+     * @return string|false
+     */
+    public function getXsdValidationBasePath()
     {
         return false;
     }
 
-    public function getNamespace(): string
+    /**
+     * @return string
+     */
+    public function getNamespace()
     {
         return 'http://example.org/schema/dic/'.$this->getAlias();
     }
@@ -67,7 +73,10 @@ public function getAlias(): string
         return Container::underscore($classBaseName);
     }
 
-    public function getConfiguration(array $config, ContainerBuilder $container): ?ConfigurationInterface
+    /**
+     * @return ConfigurationInterface|null
+     */
+    public function getConfiguration(array $config, ContainerBuilder $container)
     {
         $class = static::class;
 

Extension/ExtensionInterface.php

@@ -33,18 +33,24 @@ public function load(array $configs, ContainerBuilder $container);
 
     /**
      * Returns the namespace to be used for this extension (XML namespace).
+     *
+     * @return string
      */
-    public function getNamespace(): string;
+    public function getNamespace();
 
     /**
      * Returns the base path for the XSD files.
+     *
+     * @return string|false
      */
-    public function getXsdValidationBasePath(): string|false;
+    public function getXsdValidationBasePath();
 
     /**
      * Returns the recommended alias to use in XML.
      *
      * This alias is also the mandatory prefix to use when using YAML.
+     *
+     * @return string
      */
-    public function getAlias(): string;
+    public function getAlias();
 }