Discussion started here symfony/symfony-docs#20932 (comment)

This adds support for resolving all registered console helpers:

For example:

use Symfony\Component\Console\Helper\ProcessHelper;
use Symfony\Component\Process\Process;

#[AsCommand('app:hello')]
class AppHelloCommand
{
    public function __invoke(OutputInterface $output, ProcessHelper $helper): int
    {
        $process = new Process(['figlet', 'Symfony']);
        $helper->run($output, $process);

        // ...

        return 0;
    }
}

Improving DX, as currently alternatives include:

• extending from the Command class and then using $this->getHelper('process')
• defining __invoke(..., Application $application) and then using $application->getHelperSet()->get('process')

Also, all of the above alternatives lack autocompletion for the concrete helper class.