jQuery compiled with Google Closure Compiler

Question

Has anyone compiled jQuery against Google's newly-released Closure compiler?

There has been reported huge savings in code size. I'm curious what the benefit is if jQuery was compiled with it.

Answer 1

John Resig reported a bug on recursive functions when he attempted to compile a nightly of jQuery 1.4, so there are a few kinks to be worked out. I wouldn't use a jQuery compiled with Closure Compiler without making sure it passes the jQuery testbed.

http://code.google.com/p/closure-compiler/issues/detail?id=1&can=1#c2

Answer 2

I tried with jQuery jQuery 1.3.2

jQuery-1.3.2.min.js     57254 Bytes
jQuery closure compiler 49730 Bytes
-----------------------------------
Reduced by               7524 Bytes
Saved 13.31% off the original size
Saved 10.87% off the gzipped size

Gain of ~7KB

But it also reports 15 Warnings and I didn't test if it still works

Answer 3

The closure compiler eliminates any code that you don't actually use. The typical web page will only use a small fraction of jQuery functions, so the most benefit will come from compiling your code together with the full version of jQuery.