I wrote about this topic before.  My small hackish mode attracted a few people for its good indentation, but it still had some issues that were hard to track down.  In short, it's quite impossible to use c-mode's indentation.

In the last few days I played with Steve Yegge's excellent js2-mode and I'll write about my setup here.  js2-mode is different from most other programming modes that you can find in Emacs (and in any other editor for that matter), because it employs a full, solid parser of the language.  Instead of guessing the syntax with buggy regexps, js2-mode actually parses your code into an abstract syntax tree (AST) and can therefore provide complex information about it, not to mention very good syntax highlighting.  For example, js2-mode can and does warn you about syntax errors such as misplaced parens, or missing semicolon, or trailing comma.  Or about undeclared variables — a ”must have” with JavaScript, since it's usually the source of many subtle bugs.

I noticed this excellent mode about an year ago, but indentation was simply unbearable so this is why I didn't use it.  But now I decided to give it a second try.  Indentation can be fixed.

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This is a minor mode that I wrote on top of js2-mode which automatically highlights all occurrences of the variable under the cursor within its defining scope.  I once saw this at a friend who was using Eclipse, and I thought it's pretty cool.  With the powerful API that js2-mode exposes, it was pretty easy to write it, even despite my limited (E)Lisp experience.

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