From 4bcb8abc2cf54758e6afe6f2da210218683ccf87 Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Thu, 8 Oct 2026 23:40:34 +0200
Subject: [PATCH] [CodeQuality] Skip anonymous class in
 AssertEmptyNullableObjectToAssertInstanceofRector

---
 .../Fixture/skip_anonymous_class.php.inc        | 17 +++++++++++++++++
 ...tyNullableObjectToAssertInstanceofRector.php |  6 ++++++
 2 files changed, 23 insertions(+)
 create mode 100644 rules-tests/CodeQuality/Rector/MethodCall/AssertEmptyNullableObjectToAssertInstanceofRector/Fixture/skip_anonymous_class.php.inc

diff --git a/rules-tests/CodeQuality/Rector/MethodCall/AssertEmptyNullableObjectToAssertInstanceofRector/Fixture/skip_anonymous_class.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/AssertEmptyNullableObjectToAssertInstanceofRector/Fixture/skip_anonymous_class.php.inc
new file mode 100644
index 00000000..5789865a
--- /dev/null
+++ b/rules-tests/CodeQuality/Rector/MethodCall/AssertEmptyNullableObjectToAssertInstanceofRector/Fixture/skip_anonymous_class.php.inc
@@ -0,0 +1,17 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\AssertEmptyNullableObjectToAssertInstanceofRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+final class SkipAnonymousClass extends TestCase
+{
+    public function test()
+    {
+        $someObject = mt_rand(0, 1) ? new class {
+            public array $items = [];
+        } : null;
+
+        $this->assertNotNull($someObject);
+    }
+}
diff --git a/rules/CodeQuality/Rector/MethodCall/AssertEmptyNullableObjectToAssertInstanceofRector.php b/rules/CodeQuality/Rector/MethodCall/AssertEmptyNullableObjectToAssertInstanceofRector.php
index 57e321c9..456b6f68 100644
--- a/rules/CodeQuality/Rector/MethodCall/AssertEmptyNullableObjectToAssertInstanceofRector.php
+++ b/rules/CodeQuality/Rector/MethodCall/AssertEmptyNullableObjectToAssertInstanceofRector.php
@@ -10,6 +10,7 @@
 use PhpParser\Node\Expr\MethodCall;
 use PhpParser\Node\Identifier;
 use PhpParser\Node\Name\FullyQualified;
+use PHPStan\Reflection\ClassReflection;
 use PHPStan\Type\ObjectType;
 use PHPStan\Type\TypeCombinator;
 use PHPStan\Type\UnionType;
@@ -107,6 +108,11 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
+        // anonymous class has no writable class name, PHPStan uses an internal AnonymousClass<hash> name
+        if ($pureType->getClassReflection() instanceof ClassReflection && $pureType->getClassReflection()->isAnonymous()) {
+            return null;
+        }
+
         $node->name = new Identifier('assertInstanceOf');
 
         $fullyQualified = new FullyQualified($pureType->getClassName());