Deprecated as Traceur is unmaintained. Check out broccoli-babel-transpiler instead.
broccoli-traceur 
Traceuris a JavaScript.next to JavaScript-of-today compiler
Issues with the output should be reported on the Traceur issue tracker.
$ npm install --save-dev broccoli-traceur
var traceur = require('broccoli-traceur');
tree = traceur(tree, options);See the Traceur options.
MIT © Sindre Sorhus