mixin.internalInterface

Code example

<?php declare(strict_types = 1);

namespace Vendor {
	/** @internal */
	interface InternalInterface {
		public function doFoo(): void;
	}
}

namespace App {
	/** @mixin \Vendor\InternalInterface */
	class MyClass {}
}

Why is it reported?

The @mixin PHPDoc tag references an interface that is marked as @internal. Internal interfaces are not part of the public API of the package that defines them. Referencing internal types in PHPDoc tags creates a dependency on implementation details that may change without notice in future versions of the package.

How to fix it

Use a public (non-internal) interface or class provided by the package instead:

 namespace App {
-	/** @mixin \Vendor\InternalInterface */
+	/** @mixin \Vendor\PublicInterface */
 	class MyClass {}
 }

If no public alternative exists, remove the @mixin tag and implement the needed methods directly in the class.