ExtJS mode for Emacs

I got used to Emacs, and it's JavaScript modes are quite modest, as far as I can tell. I'm about to do some serious ExtJS coding, and I'd like to use Emacs. Spket plugin available in Eclipse is great, bu开发者_Python百科t is there any ExtJS Emacs mode available? After thorough Google querying, I reckon that chances are very slim, but... hey... just asking...

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I'm not a JavaScript programmer, but I seem to recall people being excited when Steve Yegge whipped up js2-mode, a JavaScript mode for emacs.

Would that do?