How to use the calendar-utils.getWeekViewHeader function in calendar-utils

function getWeekView(events, viewDate, excluded) {

      var days = calendarUtils.getWeekViewHeader({
        viewDate: viewDate,
        excluded: excluded,
        weekStartsOn: moment().startOf('week').day()
      }).map(function(day) {
        day.date = moment(day.date);
        day.weekDayLabel = formatDate(day.date, calendarConfig.dateFormats.weekDay);
        day.dayLabel = formatDate(day.date, calendarConfig.dateFormats.day);
        return day;
      });

      var startOfWeek = moment(viewDate).startOf('week');
      var endOfWeek = moment(viewDate).endOf('week');

      var eventRows = calendarUtils.getWeekView({
        viewDate: viewDate,
        weekStartsOn: moment().startOf('week').day(),