Add "never" return-type for closure that never return anything
-function () {
+function (): never {
throw new InvalidException();
}Configure your rector.php:
<?php
use Rector\Config\RectorConfig;
use Rector\TypeDeclaration\Rector\Closure\AddClosureNeverReturnTypeRector;
return RectorConfig::configure()
->withRules([
AddClosureNeverReturnTypeRector::class,
]);