RectorConfigBuilderRector

Find another rule

Change RectorConfig to RectorConfigBuilder

-return static function (RectorConfig $rectorConfig): void {
-    $rectorConfig->rule(SomeRector::class);
-};
+return RectorConfig::configure()->rules([SomeRector::class]);

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Transform\Rector\FileWithoutNamespace\RectorConfigBuilderRector;

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