@rwaldron I'd prefer to use strict mode everywhere, I just don't want to alienate the majority of Meteor developers who have no experience with ES6 (and may not necessarily want to have their code compiled as a module).

We could either choose one to be default and allow changes through [Meteor.settings](http://docs.meteor.com/#meteor_settings) or specify a module plugin for the `.module.js` extension. What do you think @mquandalle?