Auto-registering a Doctrine custom type in Symfony bundle configuration

AcmeDemoBundle.php

<?php
declare(strict_types=1);

namespace Acme\DemoBundle;

use Acme\DemoBundle\Doctrine\DBAL\Types\MyCustomType;
use Doctrine\DBAL\Types\Type;
use Doctrine\Persistence\ManagerRegistry;
use Symfony\Component\HttpKernel\Bundle\Bundle;

class AcmeDemoBundle extends Bundle
{
    public function boot(): void
    {
        if (!Type::hasType('my_type')) {
            Type::addType('my_type', MyCustomType::class);
        }

        /** @var ManagerRegistry $registry */
        $registry = $this->container->get('doctrine');

        foreach ($registry->getConnections() as $connection) {
            $connection->getDatabasePlatform()->registerDoctrineTypeMapping('my_type', 'my_type');
        }
    }
}

When creating a third-party bundle for Symfony, instead of asking users of the bundle to add the custom type to their doctrine.yaml configuration, you can include this in your bundle and when the bundle is loaded it will automatically register the customer DBAL type.