Add support for union types on AsEventListener

Fan2Shrek · Fan2Shrek · commit a69f5dd8f2ee · 2025-07-27T22:55:03.000+02:00
diff --git a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
@@ -8,6 +8,7 @@ CHANGELOG
  * Allow using their name without added suffix when using `#[Target]` for custom services
  * Deprecate `Symfony\Bundle\FrameworkBundle\Console\Application::add()` in favor of `Symfony\Bundle\FrameworkBundle\Console\Application::addCommand()`
  * Add `assertEmailAddressNotContains()` to the `MailerAssertionsTrait`
+ * Add support for union types with `Symfony\Component\EventDispatcher\Attribute\AsEventListener`
 
 7.3
 ---
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -752,13 +752,32 @@ public function load(array $configs, ContainerBuilder $container): void
 
         $container->registerAttributeForAutoconfiguration(AsEventListener::class, static function (ChildDefinition $definition, AsEventListener $attribute, \ReflectionClass|\ReflectionMethod $reflector) {
             $tagAttributes = get_object_vars($attribute);
-            if ($reflector instanceof \ReflectionMethod) {
-                if (isset($tagAttributes['method'])) {
-                    throw new LogicException(\sprintf('AsEventListener attribute cannot declare a method on "%s::%s()".', $reflector->class, $reflector->name));
+
+            if (!$reflector instanceof \ReflectionMethod) {
+                $definition->addTag('kernel.event_listener', $tagAttributes);
+
+                return;
+            }
+
+            if (isset($tagAttributes['method'])) {
+                throw new LogicException(\sprintf('AsEventListener attribute cannot declare a method on "%s::%s()".', $reflector->class, $reflector->name));
+            }
+
+            $tagAttributes['method'] = $reflector->getName();
+
+            if (!$eventArg = $reflector->getParameters()[0] ?? null) {
+                throw new LogicException(\sprintf('AsEventListener attribute requires the first argument of "%s::%s()" to be an event object.', $reflector->class, $reflector->name));
+            }
+
+            $types = ($type = $eventArg->getType() instanceof \ReflectionUnionType ? $eventArg->getType()->getTypes() : [$eventArg->getType()]) ?: [];
+
+            foreach ($types as $type) {
+                if ($type instanceof \ReflectionNamedType && !$type->isBuiltin()) {
+                    $tagAttributes['event'] = $type->getName();
+
+                    $definition->addTag('kernel.event_listener', $tagAttributes);
                 }
-                $tagAttributes['method'] = $reflector->getName();
             }
-            $definition->addTag('kernel.event_listener', $tagAttributes);
         });
         $container->registerAttributeForAutoconfiguration(AsController::class, static function (ChildDefinition $definition, AsController $attribute): void {
             $definition->addTag('controller.service_arguments');
