detecting global leaks mocha

leaks-mocha.js

//Detecting which module is causing a global leak can be cumbersome and boring. But there is a nice little trick to find the little bastard. Add these lines at the very beginning of your tests:

Object.defineProperty(global, "name_of_leaking_property", {
    set : function(value) {
        throw new Error("Found the leak!");
    }
})
// This will print a stacktrace that shows which module caused the leak.
// https://github.com/mochajs/mocha/wiki/Detecting-global-leaks