Initial Drupal 11 with DDEV setup

vendor/symfony/validator/Constraints/Yaml.php

@@ -0,0 +1,48 @@
+<?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\Validator\Constraints;
+
+use Symfony\Component\Validator\Attribute\HasNamedArguments;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Exception\LogicException;
+use Symfony\Component\Yaml\Parser;
+
+/**
+ * @author Kev <https://github.com/symfonyaml>
+ */
+#[\Attribute(\Attribute::TARGET_PROPERTY | \Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
+class Yaml extends Constraint
+{
+    public const INVALID_YAML_ERROR = '63313a31-837c-42bb-99eb-542c76aacc48';
+
+    protected const ERROR_NAMES = [
+        self::INVALID_YAML_ERROR => 'INVALID_YAML_ERROR',
+    ];
+
+    /**
+     * @param int-mask-of<\Symfony\Component\Yaml\Yaml::PARSE_*> $flags
+     * @param string[]|null                                      $groups
+     */
+    #[HasNamedArguments]
+    public function __construct(
+        public string $message = 'This value is not valid YAML.',
+        public int $flags = 0,
+        ?array $groups = null,
+        mixed $payload = null,
+    ) {
+        if (!class_exists(Parser::class)) {
+            throw new LogicException('The Yaml component is required to use the Yaml constraint. Try running "composer require symfony/yaml".');
+        }
+
+        parent::__construct(null, $groups, $payload);
+    }
+}