instanceof.internalClass

Code example

<?php declare(strict_types = 1);

namespace Vendor {
	/** @internal */
	class InternalService {}
}

namespace App {
	function checkService(object $obj): void
	{
		if ($obj instanceof \Vendor\InternalService) {
		}
	}
}

Why is it reported?

The class used in the instanceof expression has been marked as @internal. Internal classes are not part of the public API of the package that defines them. Relying on internal types in instanceof checks creates a dependency on implementation details that may change without notice in future versions of the package.

How to fix it

Use a public interface or class provided by the package instead:

 <?php declare(strict_types = 1);

 namespace App;

-use Some\Internal\InternalService;
+use Some\PublicServiceInterface;

 function checkService(object $obj): void
 {
-	if ($obj instanceof InternalService) {
+	if ($obj instanceof PublicServiceInterface) {
 		// ...
 	}
 }

If no public alternative exists, contact the package maintainer to request a public API.