Error Identifier: assert.internalTrait

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

// In package vendor/some-library:

namespace SomeLibrary;

/** @internal */
trait Loggable
{
	public function log(string $message): void
	{
		// ...
	}
}

<?php declare(strict_types = 1);

// In your code:

namespace App;

use SomeLibrary\Loggable;

class Checker
{
	/**
	 * @phpstan-assert Loggable $value
	 */
	public function assertLoggable(mixed $value): void
	{
		// ...
	}
}

Why is it reported? #

A @phpstan-assert PHPDoc tag references a trait 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 against a trait’s functionality, consider using a public interface that the trait implements, or define your own type.

How to ignore this error #

You can use the identifier assert.internalTrait to ignore this error using a comment:

// @phpstan-ignore assert.internalTrait
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: assert.internalTrait

Rules that report this error #

PHPStan\Rules\InternalTag\RestrictedInternalClassNameUsageExtension [1]

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