Grunt: Watch multiple files, Compile only Changed

I’ve finally found a real solution! And it’s super simple too!

npm install grunt-newer --save-dev

Then in your Gruntfile (after loading the task in grunt):

watch:
    coffeescript:
        files: 'assets/javascript/**/*.coffee'
        tasks: ["newer:coffee"]

And that’s it! The Awesome grunt-newer is awesome!