Document the :generated subtask.

[jdfm]

It would have saved me hours of trouble if I had known that I could have just used the :generated subtask for uglify and cssmin. This allows me to have as many subtasks for each of these tasks that I want, but still use the expected behaviour from usemin whenever I want as well.

/* in grunt.initConfig */
cssmin: {
  options: {
    keepSpecialComments: 0
  },
  css: {
    expand: true,
    cwd: 'public/css/',
    src: ['main.css', '!*.min.css'],
    dest: 'public/css/',
    ext: '.min.css',
    options: {
      keepSpecialComments: 0
    }
  }
},
});
grunt.registerTask('css', ['less:css','concat:css','cssmin:css']);
grunt.registerTask('build', [
  'clean:dist',
  'useminPrepare',
  'imagemin:dist',
  'less',
  'concat',
  'copy:dist',
  'uglify:generated', // http://i.imgur.com/DgtYV.gif
  'cssmin:generated', // http://i.imgur.com/DgtYV.gif
  'rev',
  'usemin',
  'htmlmin',
  'clean:post'
]);

Running grunt build will now execute the expected cssmin task via usemin. If I had tried using just cssmin or cssmin:dist instead of cssmin:generated it would no longer run the usemin task.

[stephanebachelier]

@jdfm I've lost hours too with generated tasks.