How to use the @material/menu-surface/foundation.MDCMenuSurfaceFoundation.numbers function in @material/menu-surface

this.adapter_.notifySelected({index});
    this.adapter_.closeSurface();

    const checkbox = this.adapter_.getCheckboxAtIndex(index);
    if (checkbox) {
      this.adapter_.toggleCheckbox(/** @type {!HTMLElement} */ (checkbox));
    }

    // Wait for the menu to close before adding/removing classes that affect styles.
    this.closeAnimationEndTimerId_ = setTimeout(() => {
      const selectionGroup = this.getSelectionGroup_(listItem);

      if (selectionGroup !== null) {
        this.handleSelectionGroup_(/** @type {!HTMLElement} */ (selectionGroup), index);
      }
    }, MDCMenuSurfaceFoundation.numbers.TRANSITION_CLOSE_DURATION);
  }

MDCMenuFoundation.prototype.handleItemAction = function (listItem) {
        var _this = this;
        var index = this.adapter_.getElementIndex(listItem);
        if (index < 0) {
            return;
        }
        this.adapter_.notifySelected({ index: index });
        this.adapter_.closeSurface();
        // Wait for the menu to close before adding/removing classes that affect styles.
        this.closeAnimationEndTimerId_ = setTimeout(function () {
            // Recompute the index in case the menu contents have changed.
            var recomputedIndex = _this.adapter_.getElementIndex(listItem);
            if (_this.adapter_.isSelectableItemAtIndex(recomputedIndex)) {
                _this.setSelectedIndex(recomputedIndex);
            }
        }, MDCMenuSurfaceFoundation.numbers.TRANSITION_CLOSE_DURATION);
    };
    MDCMenuFoundation.prototype.handleMenuSurfaceOpened = function () {