Blank screen when die() in an AbstractExtension

[janhenckens]

I have a package that wraps larapack/dd in a Twig Extension and I'm having a problem on projects that are using Twig 2.11 (issue on my repo)

Larapack has a 'dump & die' method (dd) and using that results in a blank screen, no matter where in the template the extension gets called.

Further debugging reveals that it is not related to larapack/dd of my extension specifically, any extension with a die() or an exit() in it results in a blank screen.

For reference, this is built as a plugin for craftcms/cms.

This worked on 2.81, but yesterday's Craft update bumped Twig from 2.8.1 to 2.11, which is why the issue shows up now.

Is this an intentional change and if so how can I make this work again? Thanks!

[fabpot]

This is indeed "expected" in recent versions of Twig. See #2995 for the PR and #1962 for the reason behind the change.

[lyrixx]

@fabpot I noticed that too. I did not take time to report this issue. Actually this make developing twig extension much harder (almost impossible).

I often do that (I just tested it with a fresh symfony 4.3 install):

class FoobarExtension extends AbstractExtension
{
    public function getFilters(): array
    {
        return [
            new TwigFilter('foobar', [$this, 'foobar']),
        ];
    }

    public function foobar($value)
    {
        dump($value);die;
    }
}

Now it display a blank page.

Maybe, we can use the $debug flag to display or not a fatal error.

[fabpot]

@lyrixx That is an option indeed. In debug mode, don't flush the output. Would you like to work on a PR?

[lyrixx]

Let's go :)

[janhenckens]

Thanks for jumping in on this @lyrixx!