[Rector] Applied all Symfony 5.x rectors to the production codebase

Applied rules:
 * AddReturnTypeDeclarationBasedOnParentClassMethodRector
 * AddReturnTypeDeclarationRector

src/bundle/DependencyInjection/Configuration.php

@@ -23,7 +23,7 @@ class Configuration extends SiteAccessConfiguration
      *
      * @return \Symfony\Component\Config\Definition\Builder\TreeBuilder The tree builder
      */
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder(IbexaFieldTypeRichTextExtension::EXTENSION_NAME);
 

src/bundle/DependencyInjection/IbexaFieldTypeRichTextExtension.php

@@ -10,6 +10,7 @@
 
 use Ibexa\Contracts\Core\Container\Encore\ConfigurationDumper as IbexaEncoreConfigurationDumper;
 use Ibexa\Contracts\FieldTypeRichText\Configuration\Provider;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Resource\FileResource;
@@ -39,7 +40,7 @@ class IbexaFieldTypeRichTextExtension extends Extension implements PrependExtens
         ],
     ];
 
-    public function getAlias()
+    public function getAlias(): string
     {
         return self::EXTENSION_NAME;
     }
@@ -193,7 +194,7 @@ private function prependJMSTranslation(ContainerBuilder $container): void
         ]);
     }
 
-    public function getConfiguration(array $config, ContainerBuilder $container)
+    public function getConfiguration(array $config, ContainerBuilder $container): ?ConfigurationInterface
     {
         return new Configuration();
     }

src/bundle/IbexaFieldTypeRichTextBundle.php

@@ -13,6 +13,7 @@
 use Ibexa\Bundle\FieldTypeRichText\DependencyInjection\Configuration\Parser\FieldType\RichText;
 use Ibexa\Bundle\FieldTypeRichText\DependencyInjection\IbexaFieldTypeRichTextExtension;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 
 /**
@@ -47,7 +48,7 @@ protected function getCoreExtension(ContainerBuilder $container): IbexaCoreExten
         return $container->getExtension('ibexa');
     }
 
-    public function getContainerExtension()
+    public function getContainerExtension(): ?ExtensionInterface
     {
         if (!isset($this->extension)) {
             $this->extension = new IbexaFieldTypeRichTextExtension();

src/lib/FieldType/RichText/Value.php

@@ -46,7 +46,7 @@ public function __construct($xml = null)
     /**
      * @see \Ibexa\Core\FieldType\Value
      */
-    public function __toString()
+    public function __toString(): string
     {
         return isset($this->xml) ? (string)$this->xml->saveXML() : self::EMPTY_VALUE;
     }

src/lib/Form/Type/RichTextFieldType.php

@@ -37,12 +37,12 @@ public function getName()
         return $this->getBlockPrefix();
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'ezplatform_fieldtype_ezrichtext';
     }
 
-    public function getParent()
+    public function getParent(): ?string
     {
         return TextareaType::class;
     }