rector/docs/HowToCreateOwnRector.md

6 Steps to Add New Rector

In case you need a transformation that you didn't find in General Rectors, you can create your own:

1. Just extend Rector\Rector\AbstractRector class. It will prepare 2 methods:

public function isCandidate(Node $node): bool
{
}

public function refactor(Node $node): ?Node
{
}

2. Put it under namespace Rector\Contrib\<set>; namespace

<?php declare(strict_types=1);

namespace Rector\Contrib\Symfony;

use Rector\Rector\AbstractRector;

final class MyRector extends AbstractRector
{
    // ...
}

3. Add a Test Case - see PHPUnit example

4. Add to specific level, e.g. /src/config/level/symfony/symfony33.yml

5. Submit PR

6. 👍