Sometimes, you've got a Drupal twig function that doesn't exist in PatternLab, and it prevents PatternLab from building.

You get this error:

PHP Fatal error:  Uncaught Twig_Error_Syntax: Unknown "typogrify" filter in {code here}

What you need to do is create a Twig stub that does either what you need it to, or nothing at all. In emulsify, my twig functions exist at emulsify/components/_twig-components/filters.

I am creating a typogrify filter, and so I created a file called typogrify.filter.php. It looks like this:

/**
 * @file
 * Add "typogrify" filter for Pattern Lab.
 */
 
$filter = new Twig_SimpleFilter('typogrify', function ($string) {
  return $string;
});

You can do anything you like here with PHP. However, I only want PatternLab to compile, I don't actually need to do any fancy typogrify stuff. Therefore, this filter merely returns the string that was passed to it as an argument.

Mischief managed!