mixin.deprecatedTrait

Code example

<?php declare(strict_types = 1);

/** @deprecated Use NewHelper instead */
trait OldHelper
{
	public function help(): void {}
}

/**
 * @mixin OldHelper
 */
class Service
{
}

Why is it reported?

This error is reported by the phpstan-deprecation-rules extension.

The @mixin PHPDoc tag references a trait that has been marked as @deprecated. Deprecated types should no longer be used as they may be removed in a future version.

Note: triggering this identifier requires using a trait in a @mixin tag, but traits are not valid types in @mixin. PHPStan therefore always also reports a mixin.trait error, and in practice the deprecation identifier is not reported alongside it.

How to fix it

Replace the deprecated trait with a class or interface in the @mixin tag:

 /**
- * @mixin OldHelper
+ * @mixin NewHelper
  */
 class Service
 {
 }