Damon, Prettier is probably going to do everything you want wrt painless javascript code formatting. It will convert your code to an AST and then pretty print it back into your file so it auto-formats as you go. You can even add it as a precommit hook or run it on a folder full of files (pretty quickly, too!) so that your entire codebase will be immediately pretty.
Here is a video from ReactConf that explains it pretty well
