Grunt directives: * removing minified files, * uglifying them and keeping original filename (with dots), adding only min.js extension at the end; * concatenating minified JS files, * minifying CSS files, * copying minified files to production directory Gruntfile.js

Gruntfile.js

module.exports = function(grunt) {
  'use strict'

  grunt.initConfig({
    clean   : [
      'js/GoalApp/js/modules/**/*.min.js',
      'css/GoalApp/css/*.min.css'
    ],
    uglify  : {
      build : {
        src     : ['**/*.js', '!*.min.js'],
        cwd     : 'js/GoalApp/js/',
        dest    : 'js/GoalApp/js/',
        expand  : true,
        rename  : function (dest, src) {
          // src modules/news/news.main.js
          var folder    = src.substring(0, src.lastIndexOf('/'));
          var filename  = src.substring(src.lastIndexOf('/'), src.length);

          filename  = filename.substring(0, filename.lastIndexOf('.'));
          
          // return js/GoalApp/js/modules/news/news.main.min.js
          return dest + folder + filename + '.min.js';
        }
      }
    },
    concat: {
      options: {
        separator: ';'
      },
      dist: {
        src: ['js/GoalApp/js/modules/**/*.min.js'],
        dest: 'js/GoalApp/js/modules/modules.min.js'
      }
    },
    cssmin : {
      minify : {
        expand: true,
        cwd   : 'css/GoalApp/css/',
        src   : ['*.css', '!*.min.css'],
        dest  : 'css/GoalApp/css/',
        ext   : '.min.css'
      }
    },
    copy : {
      js : {
        files : [{
          expand  : true,
          cwd     : 'js/',
          src     : ['**/*.min.js'],
          dest    : 'production/js/'
        }]
      }
    }
  });

  grunt.loadNpmTasks('grunt-contrib-clean');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-cssmin');
  grunt.loadNpmTasks('grunt-contrib-concat');
  grunt.loadNpmTasks('grunt-contrib-copy');

  grunt.registerTask('default', ['clean', 'uglify', 'cssmin', 'concat', 'copy']);
};