I know the ESC key does code completion, but is there a way to get a pop-up(tool-tip I guess) that shows you all the possible choices for a piece of code? As an example, it
Check out subtleGradient's tmbundle: https://github.com/subtleGradient/javascript.tmbundle
It knows how to auto-wrap for arrays, and objects. Documentation look-up too.
I don't have Textmate available to try it out, but I believe that option-Esc is supposed to show you the list of possible code completions.