primary grunt file

Gruntfile.js

/**
 *
 */

module.exports = function(grunt) {

    var timestamp = new Date().getTime() + '';
    var pkg = grunt.file.readJSON('package.json');

    // 1. All configuration goes here
    grunt.initConfig({

        pkg: pkg,

        watch: {
            scripts: {
                files: ['assets/js/**/*.js', 'assets/js/*.js'],
                tasks: ['js-task']
            },
            css: {
                files: ['assets/less/*.less'],
                tasks: ['css-task']
            }
        },
        concat: {
            options: {
                separator: ';'
            },
            dist: {
                src: ['assets/js/*.js', 'assets/js/**/*.js'],
                dest: 'public/primary.js'
            }
        },
        less: {
            production: {
                options: {
                    paths: ['assets/less']
                },
                files: {
                    'public/css/master.css': 'assets/less/master.less'
                }
            }
        },
        cssmin: {
            options: {
              shorthandCompacting: false
           },
           plugin: {
                files: {
                    'public/css/master.min.css': ['public/css/master.css']
                }
           }
        }
    });
    // 3. Where we tell Grunt we plan to use this plug-in.
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-contrib-cssmin');
    grunt.loadNpmTasks('grunt-contrib-uglify');
    grunt.loadNpmTasks('grunt-contrib-concat');
    grunt.loadNpmTasks('grunt-contrib-less');

    // 4. Where we tell Grunt what to do when we type "grunt" into the terminal.
    grunt.registerTask('default', ['concat', 'less:production', 'cssmin']);
    grunt.registerTask('js-task', ['concat']);
    grunt.registerTask('css-task', ['less:production', 'cssmin']);
    grunt.registerTask('less', ['less:production']);
}