instanceof.internalInterface

Code example

<?php declare(strict_types = 1);

namespace Vendor {
	/** @internal */
	interface InternalInterface {}
}

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

Why is it reported?

The interface used in the instanceof expression has been marked as @internal. Internal interfaces 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:

 function checkHandler(object $obj): void
 {
-	if ($obj instanceof \Vendor\InternalInterface) {
+	if ($obj instanceof \Vendor\PublicInterface) {
 	}
 }

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