old_contents: module.exports = function (grunt) {
      grunt.initConfig({
          clean: {
              files: ['app/app.js']
          },
  
          concat: {
              dist: {
                  src: [
                      '../dist/mods.min.js',
                      'src/intro.js',
                      'src/**/*.js'
                  ],
                  dest: 'app/app.js'
              }
          },
  
          uglify: {
              dist: {
                  src: 'app/app.js',
                  dest: 'app/app.js'
              }
          },
  
          qunit: {
              files: ['test/**/*.html']
          }
      });
  
      // These plugins provide necessary tasks.
      grunt.loadNpmTasks('grunt-contrib-clean');
      grunt.loadNpmTasks('grunt-contrib-concat');
      grunt.loadNpmTasks('grunt-contrib-uglify');
  
      // Default task.
      grunt.registerTask('default', ['clean', 'concat', 'uglify']);
  
  };
  
new_contents: module.exports = function (grunt) {
      grunt.initConfig({
          clean: {
              files: ['app/app.js']
          },
  
          concat: {
              dist: {
                  src: [
                      '../dist/mods.min.js',
                      'src/intro.js',
                      'src/**/*.js'
                  ],
                  dest: 'app/app.js'
              }
          },
  
          uglify: {
              dist: {
                  src: 'app/app.js',
                  dest: 'app/app.js'
              }
          }
      });
  
      // These plugins provide necessary tasks.
      grunt.loadNpmTasks('grunt-contrib-clean');
      grunt.loadNpmTasks('grunt-contrib-concat');
      grunt.loadNpmTasks('grunt-contrib-uglify');
  
      // Default task.
      grunt.registerTask('default', ['clean', 'concat', 'uglify']);
  
  };
  
subject: Update Gruntfile.js