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I think this feature can save more keystrokes then you can imagine since by the time the Developer switches to browser window to see the changes they already will be there.
Resources
- http://nodejs.org/api/fs.html#fs_fs_watch_filename_options_listener - How to watch for changes in folder using NodeJS
- https://github.com/einaros/ws - WebSockets server module for NodeJS (other WebSockets servers: http://stackoverflow.com/questions/16392260/which-websocket-library-to-use-with-node-js)