On: Andy Hertzfeld tells about the team behind Google+...

[pkulak]

Well, regardless of where the original JS came from it's not surprising that Google would use their JS compiler to package it.

[nprincigalli → pkulak]

Google's Closure goes way beyond the Closure Compiler:, check it out: http://code.google.com/closure/ .

In certain ways, it's similar to Dojo (http://dojotoolkit.org/) or YUI (http://developer.yahoo.com/yui/)