Initial Drupal 11 with DDEV setup

vendor/symfony/serializer/Mapping/Factory/ClassResolverTrait.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Mapping\Factory;
+
+use Symfony\Component\Serializer\Exception\InvalidArgumentException;
+
+/**
+ * Resolves a class name.
+ *
+ * @internal
+ *
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+trait ClassResolverTrait
+{
+    /**
+     * Gets a class name for a given class or instance.
+     *
+     * @throws InvalidArgumentException If the class does not exist
+     */
+    private function getClass(object|string $value): string
+    {
+        if (\is_string($value)) {
+            if (!class_exists($value) && !interface_exists($value, false)) {
+                throw new InvalidArgumentException(\sprintf('The class or interface "%s" does not exist.', $value));
+            }
+
+            return ltrim($value, '\\');
+        }
+
+        return $value::class;
+    }
+}