code: function addTaskGroup(taskGroup, grunt, parser, descriptionOverrides,
                        formattingOptions) {
    var parserGruntTasks;
    var taskName, taskInfo;
    var n;
  
    // Create the parser for this group.
    parserGruntTasks = parser.addArgumentGroup({
      title: taskGroup.header ? taskGroup.header : 'Grunt tasks',
      required: false
    });
  
    // Iterate through all tasks that we want to see in the output.
    for (n = 0; n < taskGroup.tasks.length; ++n) {
      taskName = taskGroup.tasks[n];
      taskInfo = grunt.task._tasks[taskName];
  
      // Add a task to the argument parser using either the user's
      // description override or its package.json description.
      parserGruntTasks.addArgument(['-' + taskName], {
          'nargs': 0,
          'required': false,
          'help': formatDescription(
            descriptionOverrides[taskName] ?
              descriptionOverrides[taskName] :
              taskInfo.info,
            formattingOptions
          )
        }
      );
    }
  }
docs: Adds a task group to the parser.
  
  @param {Object} taskGroup The task group object
  @param {Object} grunt The global Grunt object
  @param {ArgumentParser} parser The global ArgumentParser object
  @param {Object} descriptionOverrides Task description overrides
  @param {Object} formattingOptions Options that determine the formatting