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vendor/symfony/config/Definition/Builder/StringNodeDefinition.php

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+<?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\Config\Definition\Builder;
+
+use Symfony\Component\Config\Definition\StringNode;
+
+/**
+ * This class provides a fluent interface for defining a node.
+ *
+ * @author Raffaele Carelle <raffaele.carelle@gmail.com>
+ */
+class StringNodeDefinition extends ScalarNodeDefinition
+{
+    public function __construct(?string $name, ?NodeParentInterface $parent = null)
+    {
+        parent::__construct($name, $parent);
+
+        $this->nullEquivalent = '';
+    }
+
+    protected function instantiateNode(): StringNode
+    {
+        return new StringNode($this->name, $this->parent, $this->pathSeparator);
+    }
+}