class.missingImplements

Code example

<?php declare(strict_types = 1);

interface Loggable
{
	public function log(): void;
}

/** @phpstan-require-implements Loggable */
trait LoggableTrait
{
	public function log(): void
	{
		// ...
	}
}

class UserService
{
	use LoggableTrait;
}

Why is it reported?

The trait declares a @phpstan-require-implements tag that requires any class using the trait to implement a specific interface. The class using the trait does not implement the required interface.

In the example above, LoggableTrait requires the using class to implement Loggable, but UserService does not declare implements Loggable.

How to fix it

Add the required interface to the class declaration:

 <?php declare(strict_types = 1);

-class UserService
+class UserService implements Loggable
 {
 	use LoggableTrait;
 }