---
title: "assert.internalEnum"
shortDescription: "Assertion in @phpstan-assert references an internal enum."
ignorable: true
---

## Code example

```php
<?php declare(strict_types = 1);

namespace Vendor {
	/** @internal */
	enum Status: string {
		case Active = 'active';
		case Inactive = 'inactive';
	}
}

namespace App {
	class Validator {
		/**
		 * @phpstan-assert \Vendor\Status $value
		 * @param mixed $value
		 */
		public function assertStatus($value): void
		{
		}
	}
}
```

## Why is it reported?

A `@phpstan-assert` PHPDoc tag references an enum that is marked as `@internal`. Internal types are not meant to be used outside of the package or namespace where they are defined. Depending on internal types in your assertions creates a fragile dependency on implementation details that can change without notice.

## How to fix it

Use a public (non-internal) type in the `@phpstan-assert` tag instead. If you need to assert a specific type, check whether the library provides a public alternative, or define your own type that serves the same purpose.
