uglify-task

uglify: {
      development: {
        options: {
          banner: '/*! Development <%= pkg.name %> <%= grunt.template.today("yyyy-mm-dd") %> */\n',
          mangle: false,
          compress: false,
          preserveComments: 'all',
          beautify: true
        },
        all: {
    files: [{
      expand: true,
      cwd: 'src/js/bundle',
      src: ['*.js'],
      dest: 'js-min/',
      //ext: '.min.js',    //commenting out for now
    }],
  }
  }
}

uglify: {
  development: {
    options: {
      banner: '/*! Development <%= pkg.name %> <%= grunt.template.today("yyyy-mm-dd") %> */\n',
      mangle: false,
      compress: false,
      preserveComments: 'all',
      beautify: true
    },
    expand: true,
    cwd: 'src/js/bundle',
    src: ['*.js'],
    dest: 'js-min/',
    //ext: '.min.js',    //commenting out for now
  }
}