Super basic Grunt.js setup for js and css files

Gruntfile.js

module.exports = function(grunt) {
  // load all grunt tasks
  require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);

  grunt.initConfig({
    uglify: {
      dist: {
        src: ['assets/js/vendor/jquery.js', 'assets/js/vendor/**/*.js'],
        dest: "assets/js/vendor.min.js"
      }
    },
    sass: {
      options: {
        style: "expanded",
        lineNumbers: true
      },
      dist: {
        files: { 'assets/styles/application.css': 'assets/styles/application.scss' }
      }
    },
    watch: {
      scripts: {
        files: ['assets/js/**/*.js', '!assets/js/vendor.min.js'],
        tasks: ['uglify'],
        options: {
            spawn: false,
        },
      },
      css: {
        files: ['assets/styles/**/*.scss'],
        tasks: ['sass'],
        options: {
            spawn: false,
        }
      }
    }
  });

  grunt.registerTask('default', ['uglify', 'sass']);
};

Package.json

{
  "name": "PACKAGE NAME",
  "version": "PACKAGE VERSION",
  "devDependencies": {
    "grunt": "~0.4.2",
    "grunt-contrib-sass": "~0.5.1",
    "grunt-contrib-watch": "~0.4.3",
    "grunt-contrib-uglify": "~0.2.0",
    "matchdep": "~0.1.2"
  }
}