A common theme in the GWT community is "I wouldn't want to build a project of THAT size using a pure JavaScript library!"

What is the largest project that you have successfully delivered with frontend functionality written in JavaScript? (not Java or GWT)

Please provide at least a hand-wavy SLOC estimate of the unique JS code (not including libraries, frameworks, toolkits, test code, generated code, server-side processing such as PHP, etc.) that was in the finished product.

Note to GWT advocates: Please read the question carefully before answering. I've heard plenty of stories about JS failures and GWT successes, but I'd like to hear some quantified JS successes.

Note to mods: This is primarily a business-of-software question, not a tools question. It factors into a real-world business decision.