How to use the @material/list/foundation.cssClasses function in @material/list

getListItem_(target) {
    let isListItem = this.adapter_.elementContainsClass(target, MDCListFoundation.cssClasses.LIST_ITEM_CLASS);

    while (!isListItem) {
      target = this.adapter_.getParentElement(target);
      if (target) {
        isListItem = this.adapter_.elementContainsClass(target, MDCListFoundation.cssClasses.LIST_ITEM_CLASS);
      } else { // target has no parent element.
        return null;
      }
    }

    return target;
  }

getSelectionGroup_(listItem) {
    let parent = this.adapter_.getParentElement(listItem);
    let isGroup = this.adapter_.elementContainsClass(parent, cssClasses.MENU_SELECTION_GROUP);

    // Iterate through ancestors until we find the group or get to the list.
    while (!isGroup && !this.adapter_.elementContainsClass(parent, MDCListFoundation.cssClasses.ROOT)) {
      parent = this.adapter_.getParentElement(listItem);
      isGroup = this.adapter_.elementContainsClass(parent, cssClasses.MENU_SELECTION_GROUP);
    }

    if (isGroup) {
      return parent;
    } else {
      return null;
    }
  }

getListItem_(target) {
    let isListItem = this.adapter_.elementContainsClass(target, MDCListFoundation.cssClasses.LIST_ITEM_CLASS);

    while (!isListItem) {
      target = this.adapter_.getParentElement(target);
      if (target) {
        isListItem = this.adapter_.elementContainsClass(target, MDCListFoundation.cssClasses.LIST_ITEM_CLASS);
      } else { // target has no parent element.
        return null;
      }
    }

    return target;
  }

mounted() {
    this.drawer_ = this.$refs.drawer;

    const listEl = this.$el.querySelector(
      `.${MDCListFoundation.cssClasses.ROOT}`,
    );
    if (listEl) {
      this.list_ = listEl;
      this.list_.wrapFocus = true;
    }

    const adapter = {
      addClass: className => this.$set(this.classes, className, true),
      removeClass: className => this.$delete(this.classes, className),
      hasClass: className => this.drawer_.classList.contains(className),
      elementHasClass: (element, className) =>
        element.classList.contains(className),
      saveFocus: () => {
        this.previousFocus_ = document.activeElement;
      },
      restoreFocus: () => {

focusActiveNavigationItem: () => {
        const activeNavItemEl = this.drawer_.querySelector(
          `.${MDCListFoundation.cssClasses.LIST_ITEM_ACTIVATED_CLASS}`,
        );
        if (activeNavItemEl) {
          activeNavItemEl.focus();
        }
      },
      notifyClose: () => {

focusActiveNavigationItem: () => {
        const activeNavItemEl = this.drawer_.querySelector(
          `.${MDCListFoundation.cssClasses.LIST_ITEM_ACTIVATED_CLASS}`,
        );
        if (activeNavItemEl) {
          activeNavItemEl.focus();
        }
      },
      notifyClose: () => {