Example of gruntfile.js and package.json file for automated workflow

Gruntfile.js

module.exports = function(grunt) {
  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),

    uglify: {
      options: {
        banner: '/*! <%= pkg.name %> <%= grunt.template.today("yyyy-mm-dd") %>'
      },
      build: {
        src: 'path-to-source',
        dest: 'path-to-destination'
      }
    },

    //compile sass files
    sass: {
      dist: {
        files: {
          'path-to-css-file' : 'path-to-scss-file',
          'path-to-css-file' : 'path-to-scss-file'
        }
      }
    },

    //minimize css file(s)
    cssmin: {
      options: {
        shorthandCompacting: false,
        roundingPrecision: -1
      },
      target: {
        files: {
          'path-to-destination': ['path-to-source-files']
        }
      }
    },

    //watch files for changes
    watch: {
        css: {
            files: ['css or sass files to watch'],
            tasks: ['sass', 'cssmin']
        },
        js:{
            files: 'path to watch',
            tasks: ['uglify']
        }
    },

    //use "copy" package to copy files installed by bower,
    //run it manually after initial bower install, or whenever bower packages are updated
    copy: {
        main: {
            files: [
                {
                    src: ['path-to-source-files'],
                    dest: 'path-to-destination',
                    filter: 'isFile'
                },
                {
                    src: ['path-to-source-files'],
                    dest: 'path-to-destination'
                }
            ]
        }
    },

    //concatenate css or js files
    concat: {
        dist: {
            /*src: [array of files to be concatenated],
            dest: 'destination file'*/
        }
    },
    
    //run js hint on file prior to and after concat
    jshint: {
      beforeconcat: ['path-to-files-before-concat'],
      afterconcat: ['path-to-concatinated-file']
    }
  });

    //require all tasks from installed packages
    require('load-grunt-tasks')(grunt);

    //register default task
    grunt.registerTask('default', ['watch', 'sass', 'uglify', 'cssmin', 'concat', 'jshint']);

    //be sure not to give task the same name as package
    //seen some bugs caused by this
    grunt.registerTask('transfer', ['copy']);
};

package.json

{
  "name": "app",
  "version": "1.0.0",
  "description": "Short description of your work",
  "main": "index.html",
  "repository": {
    "type": "git",
    "url": "path-to-your-repo"
  },
  "keywords": [ ],
  "author": "Pejic Ivan",
  "license": "ISC",
  "devDependencies": {
    "grunt": "^0.4.5",
    "grunt-contrib-copy": "^1.0.0",
    "grunt-contrib-concat": "^1.0.0",
    "grunt-contrib-cssmin": "^1.0.1",
    "grunt-contrib-jshint": "^1.0.0",
    "grunt-contrib-sass": "^1.0.0",
    "grunt-contrib-uglify": "^1.0.1",
    "grunt-contrib-watch": "^1.0.0",
    "load-grunt-tasks": "^3.4.1"
  }
}