add readonly to properties

Author: dominikzogg

src/Factory.php

@@ -11,12 +11,12 @@ final class Factory
     /**
      * @var callable
      */
-    private $previousFactory;
+    private readonly mixed $previousFactory;
 
     /**
      * @var callable
      */
-    private $factory;
+    private readonly mixed $factory;
 
     public function __construct(callable $previousFactory, callable $factory)
     {

src/Parameter.php

@@ -6,10 +6,7 @@
 
 final class Parameter
 {
-    /**
-     * @param mixed $parameter
-     */
-    public function __construct(private $parameter) {}
+    public function __construct(private readonly mixed $parameter) {}
 
     public function __invoke(): mixed
     {