Try

rector.php

@@ -14,6 +14,7 @@
         __DIR__.'/tests',
         __DIR__.'/.php-cs-fixer.php',
         __DIR__.'/rector.php',
+        __DIR__.'/scoper.inc.php',
     ]);
 
     $rectorConfig->sets([

scoper.inc.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Component\Finder\Finder;
+use Twig\Extension\ExtensionInterface;
+use Twig\NodeVisitor\NodeVisitorInterface;
+use Twig\TokenParser\TokenParserInterface;
+
+return [
+    'exclude-namespaces' => ['TwigCsFixer'],
+    'expose-classes' => [
+        Finder::class,
+        ExtensionInterface::class,
+        NodeVisitorInterface::class,
+        TokenParserInterface::class,
+    ],
+];