Support PHP 8.4+

.github/workflows/quality-assurance.yaml

@@ -10,7 +10,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                php: [ '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3' ]
+                php: [ '8.0', '8.1', '8.2', '8.3', '8.4', '8.5' ]
                 composer-flags: [ '' ]
                 phpunit-flags: [ '--coverage-text' ]
         steps:

src/DelegatingProvider.php

@@ -32,10 +32,10 @@ class DelegatingProvider implements ListenerProviderInterface
      */
     protected $providers =[];
 
-    /** @var ListenerProviderInterface */
+    /** @var ListenerProviderInterface|null */
     protected $defaultProvider;
 
-    public function __construct(ListenerProviderInterface $defaultProvider = null)
+    public function __construct(?ListenerProviderInterface $defaultProvider = null)
     {
         if ($defaultProvider) {
             $this->defaultProvider = $defaultProvider;

src/ParameterDeriverTrait.php

@@ -34,9 +34,14 @@ protected function getParameterType($callable): string
             }
 
             $rType = $params[0]->getType();
-            if ($rType === null) {
-                throw new \InvalidArgumentException('Listeners must declare an object type they can accept.');
+            if (
+                $rType === null                                 // no type declared
+                || !($rType instanceof \ReflectionNamedType)    // type is union or intersection
+                || $rType->isBuiltIn()                          // type is built-in, aka scalar/primitive
+            ) {
+                throw new \InvalidArgumentException('Listeners must declare a single class/interface type they can accept.');
             }
+
             $type = $rType->getName();
         }
         catch (\ReflectionException $e) {