requireExtends.internalEnum

Code example

<?php declare(strict_types = 1); // lint >= 8.1

namespace Vendor {
	/** @internal */
	enum InternalEnum {
		case A;
	}
}

namespace App {
	/**
	 * @phpstan-require-extends \Vendor\InternalEnum
	 */
	interface MyInterface {}
}

Why is it reported?

The @phpstan-require-extends PHPDoc tag references an enum that is marked as @internal. Internal types are not part of the public API of their package and may change or be removed without notice.

Note: triggering this identifier requires using an enum in @phpstan-require-extends, which only accepts classes. PHPStan therefore always also reports a requireExtends.enum error alongside this one.

How to fix it

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

 /**
- * @phpstan-require-extends \Vendor\InternalEnum
+ * @phpstan-require-extends \Vendor\PublicBaseClass
  */
 interface MyInterface {}

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