How to use the @material/dialog.MDCDialogFoundation.cssClasses function in @material/dialog

const interval = $interval(function() {
          // wait for close animation to finish before destroying
          if (!element.hasClass(MDCDialogFoundation.cssClasses.ANIMATING)) {
            $interval.cancel(interval);
            resolve();
          }
        }, 10);
      }).then(function() {

function hideDialog(action = '') {
    this.isOpen_ = false;
    this.adapter_.addClass(MDCDialogFoundation.cssClasses.CLOSING);
    this.adapter_.removeClass(MDCDialogFoundation.cssClasses.OPEN);
    this.adapter_.removeBodyClass(MDCDialogFoundation.cssClasses.SCROLL_LOCK);

    cancelAnimationFrame(this.animationFrame_);
    this.animationFrame_ = 0;

    clearTimeout(this.animationTimer_);
    this.animationTimer_ = setTimeout(() => {
        this.adapter_.releaseFocus();
        this.handleAnimationTimerEnd_();
        this.adapter_.notifyClosed(action);
    }, MDCDialogFoundation.numbers.DIALOG_ANIMATION_CLOSE_TIME_MS);
}

function hideDialog(action = '') {
    this.isOpen_ = false;
    this.adapter_.addClass(MDCDialogFoundation.cssClasses.CLOSING);
    this.adapter_.removeClass(MDCDialogFoundation.cssClasses.OPEN);
    this.adapter_.removeBodyClass(MDCDialogFoundation.cssClasses.SCROLL_LOCK);

    cancelAnimationFrame(this.animationFrame_);
    this.animationFrame_ = 0;

    clearTimeout(this.animationTimer_);
    this.animationTimer_ = setTimeout(() => {
        this.adapter_.releaseFocus();
        this.handleAnimationTimerEnd_();
        this.adapter_.notifyClosed(action);
    }, MDCDialogFoundation.numbers.DIALOG_ANIMATION_CLOSE_TIME_MS);
}