How can I detect leaking variables into a global namespace?

Question

I have noticed a big amount of variables in my code leaked into global namespace. Is there a way to automatically find such leakages and report their position in the code?

I thought that code quality tools like jslint / jshint would be able to help me, but looking through their documentation I was not able to find anything related to this (although it looks like it should exist). I was not able to find a lot of information with keywords as in my title on google. One of the few relevant findings was this post from 2009.

Answer 1

The JSLint online tool shows you what globals are there

Answer 2

Maybe do something like this

for (var inGlobalScope in window) {
        console.log(inGlobalScope);
    }

Then go through the list of log entries to determine what shouldn't be in the global scope.