add readonly to properties add mixed type to callable to make it happen

Author: dominikzogg

src/Middleware/CallbackMiddleware.php

@@ -14,7 +14,7 @@ final class CallbackMiddleware implements MiddlewareInterface
     /**
      * @var callable
      */
-    private $callback;
+    private readonly mixed $callback;
 
     public function __construct(callable $callback)
     {

src/Middleware/SlimCallbackMiddleware.php

@@ -17,7 +17,7 @@ final class SlimCallbackMiddleware implements MiddlewareInterface
     /**
      * @var callable
      */
-    private $slimCallable;
+    private readonly mixed $slimCallable;
 
     public function __construct(callable $slimCallable, private readonly ResponseFactoryInterface $responseFactory)
     {

src/RequestHandler/CallbackRequestHandler.php

@@ -13,7 +13,7 @@ final class CallbackRequestHandler implements RequestHandlerInterface
     /**
      * @var callable
      */
-    private $callback;
+    private readonly mixed $callback;
 
     public function __construct(callable $callback)
     {

src/RequestHandler/SlimCallbackRequestHandler.php

@@ -16,7 +16,7 @@ final class SlimCallbackRequestHandler implements RequestHandlerInterface
     /**
      * @var callable
      */
-    private $slimCallable;
+    private readonly mixed $slimCallable;
 
     public function __construct(callable $slimCallable, private readonly ResponseFactoryInterface $responseFactory)
     {