requireImplements.internalClass

Code example

<?php declare(strict_types = 1);

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

namespace App {
	/**
	 * @phpstan-require-implements \Vendor\InternalHelper
	 */
	trait HelperAware {}
}

Why is it reported?

The @phpstan-require-implements PHPDoc tag references a class that is marked as @internal. Internal classes are not meant to be used outside the package that defines them.

Note: triggering this identifier requires using a class in @phpstan-require-implements, which only accepts interfaces. PHPStan therefore always also reports a requireImplements.class error alongside this one.

How to fix it

Use a public (non-internal) interface instead:

 /**
- * @phpstan-require-implements \Vendor\InternalHelper
+ * @phpstan-require-implements \Vendor\PublicHelperInterface
  */
 trait HelperAware {}

If the internal class is within the same package and the usage is intentional, the @internal tag may need to be reconsidered, or a different design approach should be used.