old_contents: /**
   * `uglify`
   *
   * ---------------------------------------------------------------
   *
   * Minify client-side JavaScript files using UglifyJS.
   *
   * For usage docs see:
   *   https://github.com/gruntjs/grunt-contrib-uglify
   *
   */
  module.exports = function(grunt) {
  
    grunt.config.set('uglify', {
      options: {
        mangle: false
      },
      dist: {
        src: ['.tmp/public/concat/production.js'],
        dest: '.tmp/public/min/production.min.js'
      }
    });
  
    grunt.loadNpmTasks('grunt-contrib-uglify-es');
  };
  
new_contents: /**
   * `uglify`
   *
   * ---------------------------------------------------------------
   *
   * Minify client-side JavaScript files using UglifyJS.
   *
   * For usage docs see:
   *   https://github.com/gruntjs/grunt-contrib-uglify
   *
   */
  module.exports = function(grunt) {
  
    grunt.config.set('uglify', {
      options: {
        mangle: false,
        compress: false,
        comments: false
      },
      dist: {
        src: ['.tmp/public/concat/production.js'],
        dest: '.tmp/public/min/production.min.js'
      }
    });
  
    grunt.loadNpmTasks('grunt-contrib-uglify-es');
  };
  
subject: update uglify options