<?php

class RectorTest
{
    /**
     * @var stdClass[]
     */
    private array $secondaries = [];

    /**
     * @return stdClass[]
     */
    public function test(): iterable
    {
        $primary = new stdClass();

        $this->secondaries = [
            new stdClass(),
            new stdClass(),
        ];

        return $this->assemble($primary);
    }

    /**
     * @return stdClass[]
     */
    private function assemble(
        stdClass $primary,
    ): iterable {
        $assembled = [
            $primary,
        ];

        foreach ($this->secondaries as $secondary) {
            $assembled[] = $secondary;
        }

        return $assembled;
    }
}

<?php

use Rector\Config\RectorConfig;
use Rector\TypeDeclaration\Rector\Property\TypedPropertyFromAssignsRector;

return RectorConfig::configure()
    ->withPreparedSets(
        deadCode:      true,
        codeQuality:   true,
        privatization: true,
);