Asynchronous support for nunjucks.addGlobal

[Shawn Lim]

I need nunjucks global functions to be able to work with asynchronous functions. My use case is to fetch translation information. 

Something like this doesn't seem to work: 

nunjucks_env.addGlobal('gettext', function(key){
  var d = $.Deferred();


  setTimeout(function(){
    d.resolve('hurray');
  }, 2000);  


  return d.promise();
});

[Lasana Murray]

As far as I can tell nunjucks does not support promises. Can you use an async filter or extensions instead?

http://mozilla.github.io/nunjucks/api.html#asynchronous1