Add dereferenceType() function

Author: vudaltsov

composer.json

@@ -28,6 +28,7 @@
             "Typhoon\\Type\\": "src/"
         },
         "files": [
+            "src/dereferenceType.php",
             "src/types.php"
         ]
     },

src/dereferenceType.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Typhoon\Type;
+
+use Typhoon\Type\Visitor\RecursiveTypeReplacer;
+
+/**
+ * @api
+ */
+function dereferenceType(Type $type): Type
+{
+    /** @var ?RecursiveTypeReplacer */
+    static $dereferencer = null;
+    $dereferencer ??= new class extends RecursiveTypeReplacer {};
+
+    return $type->accept($dereferencer);
+}