Redirection in a helper

Hello there,

With ci3, I usually created a helper with a function called "redirect_if_not_logged_in()" that I called at the top of some controllers.

The goal of that function was quite self-explanatory: it checked if the visitor was logged in and if not, redirected them to the login page.

Alas, when trying to do the same with ci4, things get a bit complicated. The "redirect()" function I used to use doesn't actually redirect, but returns an elusive RedirectResponse (completely missing from the doc, by the way).

The only thing I imagine myself doing for now is this:

PHP Code:

// in a helper:

if (!function_exists('redirectIfNotLoggedIn'))
{
    $session = \Config\Services::session();
    if ($session->get('loggedUser') === null)
    {
        return redirect('user/login');
    }
    return null;
}

// in a controller:

public function create()
{
    $redirection = redirectIfNotLoggedIn();
    if ($redirection !== null)
    {
        return $redirection;
    }
    // ...
} 


But sincerely, that's pretty much as much code to call the helper and use it than to simple copy-paste the code inside the controller.

How can I redirect FROM the helper?

Nice day to you all!