Move property default from constructor to property default
 final class SomeClass
 {
-    private $name;
+    private $name = 'John';
     public function __construct()
     {
-        $this->name = 'John';
     }
 }Configure your rector.php:
<?php
use Rector\CodeQuality\Rector\Class_\InlineConstructorDefaultToPropertyRector;
use Rector\Config\RectorConfig;
return RectorConfig::configure()
    ->withRules([
        InlineConstructorDefaultToPropertyRector::class,
    ]);