Convert DuplicateDeclarationHelper to AutowiredService instance

Rule helpers should be instances with AutowiredService so that
dependencies can be injected into them later.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

src/Rules/Classes/DuplicateDeclarationHelper.php

@@ -6,6 +6,7 @@
 use PhpParser\Node\Stmt\ClassConst;
 use PhpParser\Node\Stmt\ClassLike;
 use PhpParser\Node\Stmt\EnumCase;
+use PHPStan\DependencyInjection\AutowiredService;
 use PHPStan\Rules\IdentifierRuleError;
 use PHPStan\Rules\RuleErrorBuilder;
 use PHPStan\ShouldNotHappenException;
@@ -14,13 +15,14 @@
 use function sprintf;
 use function strtolower;
 
+#[AutowiredService]
 final class DuplicateDeclarationHelper
 {
 
 	/**
 	 * @return list<IdentifierRuleError>
 	 */
-	public static function checkClassLike(ClassLike $classLike, string $displayName, string $identifierType): array
+	public function checkClassLike(ClassLike $classLike, string $displayName, string $identifierType): array
 	{
 		$errors = [];
 

src/Rules/Classes/DuplicateDeclarationRule.php

@@ -16,6 +16,10 @@
 final class DuplicateDeclarationRule implements Rule
 {
 
+	public function __construct(private DuplicateDeclarationHelper $helper)
+	{
+	}
+
 	public function getNodeType(): string
 	{
 		return InClassNode::class;
@@ -25,7 +29,7 @@ public function processNode(Node $node, Scope $scope): array
 	{
 		$classReflection = $node->getClassReflection();
 
-		return DuplicateDeclarationHelper::checkClassLike(
+		return $this->helper->checkClassLike(
 			$node->getOriginalNode(),
 			$classReflection->getDisplayName(),
 			strtolower($classReflection->getClassTypeDescription()),

src/Rules/Classes/DuplicateTraitDeclarationRule.php

@@ -15,14 +15,18 @@
 final class DuplicateTraitDeclarationRule implements Rule
 {
 
+	public function __construct(private DuplicateDeclarationHelper $helper)
+	{
+	}
+
 	public function getNodeType(): string
 	{
 		return InTraitNode::class;
 	}
 
 	public function processNode(Node $node, Scope $scope): array
 	{
-		return DuplicateDeclarationHelper::checkClassLike(
+		return $this->helper->checkClassLike(
 			$node->getOriginalNode(),
 			$node->getTraitReflection()->getDisplayName(),
 			'trait',

tests/PHPStan/Rules/Classes/DuplicateDeclarationRuleTest.php

@@ -14,7 +14,7 @@ class DuplicateDeclarationRuleTest extends RuleTestCase
 
 	protected function getRule(): Rule
 	{
-		return new DuplicateDeclarationRule();
+		return new DuplicateDeclarationRule(new DuplicateDeclarationHelper());
 	}
 
 	public function testDuplicateDeclarations(): void

tests/PHPStan/Rules/Classes/DuplicateTraitDeclarationRuleTest.php

@@ -13,7 +13,7 @@ class DuplicateTraitDeclarationRuleTest extends RuleTestCase
 
 	protected function getRule(): Rule
 	{
-		return new DuplicateTraitDeclarationRule();
+		return new DuplicateTraitDeclarationRule(new DuplicateDeclarationHelper());
 	}
 
 	public function testBug14250(): void