requireImplements.internalInterface

Code example

<?php declare(strict_types = 1);

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

namespace App {
	/**
	 * @phpstan-require-implements \Vendor\InternalInterface
	 */
	trait MyTrait {}
}

Why is it reported?

The @phpstan-require-implements PHPDoc tag references an interface that is marked as @internal. Internal interfaces are not part of the public API of their package and may change or be removed without notice. Depending on an internal interface in a @phpstan-require-implements constraint creates a fragile dependency on implementation details.

How to fix it

Use a public (non-internal) interface in the @phpstan-require-implements tag instead:

 /**
- * @phpstan-require-implements \Vendor\InternalInterface
+ * @phpstan-require-implements \Vendor\PublicInterface
  */
 trait MyTrait {}

If no public alternative exists, consider reaching out to the package maintainers to request a public API for your use case.