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Run Rector on your code to see what it can do for you:

PHP snippet to change

<?php

final class DemoFile
{
    public function run(bool $param)
    {
        if ($this->isTrue($param)) {
            return 5;
        }

        return '10';
    }

    private function isTrue($value)
    {
        return $value === true;
    }
}

Config rector.php

<?php

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

return RectorConfig::configure()
    // A. whole set
    ->withPreparedSets(typeDeclarations: true)
    // B. or few rules
    ->withRules([
        TypedPropertyFromAssignsRector::class
    ])
    // demonstrate specific PHP version
    ->withPhpVersion(PhpVersion::PHP_84);

Rector version: a6f0ce - released at 2025-12-30 10:02