Use sussy with laravel

Question

Can anybody help me in using susy with laravel project?

I have installed all the dependencies using npm install and followed these steps to install susy.

this is my webpack.mix.js file

mix.js('resources/assets/js/app.js', 'public/js')
   .sass('resources/assets/sass/app.scss', 'public/css')
   .webpackConfig({
       resolve: {
           modules:[
               loaders: [
                   {
                     test: /\.scss$/,
                     loader: 'style!css!sass'
                   }
               ]
           ]           
       }
   });

I am getting this error when I run npm run watch