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We where evaluating javascript frameworks, and i was pointed out that Google, altough promoting the development of angular, is not using it in GMail.
But what is actually being used in GMail, if a javascript framework used at all? It is one of the best front end applications around, so this is interesting to know. The client side logic looks quite rich, also.
I googled around but i didn't find anything.
It uses Google's closure library. It is explicitly stated here. https://code.google.com/p/closure-library/
As far as I'm aware the bulk of the code that drives GMail is Google's Closure library: http://googlecode.blogspot.com/2009/11/introducing-closure-tools.html
Google's Closure Library [latest link]:
https://developers.google.com/closure/library/