How can I add a custom twig function to Craft CMS version 3?
Twig outlines how to add a function but not sure how to apply to Craft.
https://twig.symfony.com/doc/2.x/advanced.html#functions
$twig = new Twig_Environment($loader);
$function = new Twig_Function('function_name', function () {
// ...
});
$twig->addFunction($function);