I remember when the whole Ajax thing kicked in and JavaScript developers looked at Gmail, Gmaps, and the like and thought “I wonder what powers that?”

Well, the power comes from Closure a library and set of tools that the great JS hackers built over time as they created the applications at scale.

As soon as I joined Google I wanted to check out this code, and talked to a bunch of folks who were interested in open sourcing it. Well, these things take time, but now we are fortunate enough to have everything out there (interestingly, a lot of the code was open due to it being used in Google Doc).

via Ajaxian » Google releases Closure, the tools behind the JS geniuses.