How to get project or root dir in symfony 5?

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use SymfonyBundleFrameworkBundleControllerAbstractController;

class MyController extends AbstractController
{
    public function myAction()
    {
        $projectDir = $this->getParameter('kernel.project_dir');
        // ...
    }
}

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# config/services.yaml
services:
    AppServiceMyService:
        arguments:
            $projectDir: '%kernel.project_dir%'

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// AppServiceMyService.php
namespace AppService;

class MyService
{
    private $projectDir;

    public function __construct(string $projectDir)
    {
        $this->projectDir = $projectDir;
    }

    // ...
}

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use SymfonyComponentConsoleCommandCommand;
use SymfonyComponentConsoleInputInputInterface;
use SymfonyComponentConsoleOutputOutputInterface;

class MyCommand extends Command
{
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $application = $this->getApplication();
        $projectDir = $application->getKernel()->getProjectDir();
        // ...
    }
}