Can't find information about JavaScript usage with Compass, in configuration i found an "javascript_dir" options, but dont know how to use it. Can somebody please explain for what this option is here, and how to use it with .scss files?
The comment above is correct, Compass and Sass don't normally interact with JS. It is possible for someone to include JS in a compass plugin, in which case Compass needs to know where those files should go when you install the plugin. That's the only use for the "javascript_dir" at this point. If you aren't installing any plugins with JS, you can ignore it.