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Error Identifier: mixin.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);

namespace App;

use Some\Internal\HelperTrait;

/**
 * @mixin HelperTrait
 */
class Foo // ERROR: PHPDoc tag @mixin references internal trait HelperTrait.
{
}

Why is it reported? #

The @mixin PHPDoc tag references a trait that is marked as @internal. Internal traits 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 class or interface provided by the package instead:

 <?php declare(strict_types = 1);
 
 namespace App;

-use Some\Internal\HelperTrait;
+use Some\PublicHelper;

 /**
- * @mixin HelperTrait
+ * @mixin PublicHelper
  */
 class Foo
 {
 }

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

How to ignore this error #

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

// @phpstan-ignore mixin.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: mixin.internalTrait

Rules that report this error #

• PHPStan\Rules\InternalTag\RestrictedInternalClassNameUsageExtension [1]

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