Compatibility with vanilla PHP Twig is not yet at 100%. If you need your templates to work with both Twig.js and Twig, stick to the supported filters and functions described below.
The following is a list of functionality present in Twig that is not yet available in Twig.js. There are some really easy pickings in these lists for anybody hoping to make a contribution to the project.
Twig.js is released under the Apache License, Version 2.0.