mixin.deprecatedInterface

Code example

<?php declare(strict_types = 1);

/** @deprecated Use NewInterface instead */
interface OldInterface
{
	public function doSomething(): void;
}

/**
 * @mixin OldInterface
 */
class Foo // ERROR: Class references deprecated interface OldInterface in @mixin tag.
{
}

Why is it reported?

This error is reported by phpstan/phpstan-deprecation-rules.

The @mixin PHPDoc tag references an interface that has been marked as deprecated with the @deprecated PHPDoc tag. Using deprecated interfaces should be avoided because they may be removed in a future version of the library or application. The deprecation notice typically suggests a replacement interface.

How to fix it

Replace the deprecated interface with its suggested replacement:

 <?php declare(strict_types = 1);

 /**
- * @mixin OldInterface
+ * @mixin NewInterface
  */
 class Foo
 {
 }