*Note - users of other JetBrains IDEs (RubyMine, PyCharm, IntelliJ IDEA, ...) will need to download and install the File Watchers plugin to use this functionality (available for free). The plugin is already bundled with WebStorm and PhpStorm.
Many users have requested variations of “Automatic JS/CSS minification,” “Automatic TypeScript compilation,” “Automatic Less compilation,” and many others