How to use the angular-calendar.DAYS_OF_WEEK.MONDAY function in angular-calendar

import { Component, ChangeDetectionStrategy } from '@angular/core';
import { CalendarEvent, CalendarView, DAYS_OF_WEEK } from 'angular-calendar';
import moment from 'moment';

// weekStartsOn option is ignored when using moment, as it needs to be configured globally for the moment locale
moment.updateLocale('en', {
  week: {
    dow: DAYS_OF_WEEK.MONDAY,
    doy: 0
  }
});

@Component({
  selector: 'mwl-demo-component',
  changeDetection: ChangeDetectionStrategy.OnPush,
  templateUrl: 'template.html'
})
export class DemoComponent {
  view: CalendarView = CalendarView.Month;

  viewDate: Date = new Date();

  events: CalendarEvent[] = [];
}

{
      provide: CalendarDateFormatter,
      useClass: CustomDateFormatter
    }
  ]
})
export class DemoComponent {
  view: CalendarView = CalendarView.Month;

  viewDate = new Date();

  events: CalendarEvent[] = [];

  locale: string = 'fr';

  weekStartsOn: number = DAYS_OF_WEEK.MONDAY;

  weekendDays: number[] = [DAYS_OF_WEEK.FRIDAY, DAYS_OF_WEEK.SATURDAY];

  CalendarView = CalendarView;

  setView(view: CalendarView) {
    this.view = view;
  }
}