RemoveIfInstanceofCollectionRector

Find another rule

Remove if instance of collection on already known Collection type

 use Doctrine\Common\Collections\Collection;

 final class SomeClass
 {
     public ?Collection $items;

     public function someMethod()
     {
-        if ($this->items instanceof Collection) {
-            $values = $this->items;
-        }
+        $values = $this->items;
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Doctrine\TypedCollections\Rector\If_\RemoveIfInstanceofCollectionRector;

return RectorConfig::configure()
    ->withRules([
        RemoveIfInstanceofCollectionRector::class,
    ]);

SETS: Typed Collections