I think it would be good to have that on both the client and the server.

Also, as simple as this might be, making it a de-facto standard (on meteor) would be a good thing since it would be a tool that we can count on, all the time. There are too many browsers IMO to make an extension a viable option.

Whitelisting variables would be good as well ; that way we do not get alerted if it is something we expect to be global.

Create a collection called MyVars and add this to your Server.js file:

Meteor.setInterval(function(){ for(var i in global){ if(MyVars.find({name:i}).count()==0){ MyVars.insert({name:i}); console.log("New Public Variable: ", i); } } }, 5000);

Thanks for the fun challenge :-)