AddAllowDynamicPropertiesAttributeRector

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Configurable

Add the AllowDynamicProperties attribute to all classes

 namespace Example\Domain;

+#[AllowDynamicProperties]
 class SomeObject {
     public string $someProperty = 'hello world';
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Transform\Rector\Class_\AddAllowDynamicPropertiesAttributeRector;

return RectorConfig::configure()
    ->withConfiguredRule(AddAllowDynamicPropertiesAttributeRector::class, [
        'Example\*',
    ]);