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# How To Configure Rules
Rector rules that implement `Rector\Core\Contract\Rector\ConfigurableRectorInterface` can be configured.
Typical example is `Rector\Renaming\Rector\Name\RenameClassRector`:
```php
<?php
// rector.php
declare(strict_types=1);
use Rector\Renaming\Rector\Name\RenameClassRector;
use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
return static function (ContainerConfigurator $containerConfigurator): void {
$services = $containerConfigurator->services();
$services->set(RenameClassRector::class)
->configure([
'App\SomeOldClass' => 'App\SomeNewClass',
]);
};
```
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