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Error Identifier: mixin.unresolvableType

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);

/**
 * @mixin T
 */
class QueryBuilder
{
}

Why is it reported? #

The @mixin PHPDoc tag contains a type that PHPStan cannot resolve. This typically happens when the type references a template type that is not declared on the current class, references an undefined class, or uses invalid type syntax.

In the example above, T is used in the @mixin tag but is not declared as a @template type parameter on the class, so PHPStan cannot determine what it refers to.

How to fix it #

If the intent is to use a generic type, declare it with @template first:

+/**
+ * @template T of Connection
+ * @mixin T
+ */
-/**
- * @mixin T
- */
 class QueryBuilder
 {
 }

Or reference a concrete class directly:

 /**
- * @mixin T
+ * @mixin Connection
  */
 class QueryBuilder
 {
 }

How to ignore this error #

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

// @phpstan-ignore mixin.unresolvableType
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.unresolvableType

Rules that report this error #

• PHPStan\Rules\Classes\MixinRule [1]
• PHPStan\Rules\Classes\MixinTraitRule [1]
• PHPStan\Rules\Classes\MixinTraitUseRule [1]

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