How to use the @material/top-app-bar/fixed/foundation function in @material/top-app-bar

//         if (this.myScrollTarget) {
      //           this.myScrollTarget.removeEventListener('scroll', handler);
      //         } else {
      //           window.removeEventListener('scroll', handler);
      //         }
      //       },
      getViewportScrollY: () => window.pageYOffset,
      getTotalActionItems: () =>
        this.$refs.root.querySelectorAll(`.${cssClasses.ACTION_ITEM}`).length,
    };

    const { short, shortCollapsed, fixed } = this;
    if (short || shortCollapsed) {
      this.foundation_ = new MDCShortTopAppBarFoundation(adapter);
    } else if (fixed) {
      this.foundation_ = new MDCFixedTopAppBarFoundation(adapter);
    } else {
      this.foundation_ = new MDCTopAppBarFoundation(adapter);
    }

    this.navIcon_ = this.$el.querySelector(NAVIGATION_ICON_SELECTOR);

    if (this.navIcon_) {
      this.navIcon_.addEventListener('click', this.handleNavigationClick_);
    }

    this.myScrollTarget = this.scrollTarget || window;
    this.foundation_.init();
  },
  beforeDestroy() {

this.myScrollTarget.removeEventListener('scroll', handler);
        } else {
          window.removeEventListener('scroll', handler);
        }
      },

      getViewportScrollY: () => window.pageYOffset,
      getTotalActionItems: () =>
        this.$refs.root.querySelectorAll(`.${cssClasses.ACTION_ITEM}`).length,
    };

    const { short, shortCollapsed, fixed } = this;
    if (short || shortCollapsed) {
      this.foundation_ = new MDCShortTopAppBarFoundation(adapter);
    } else if (fixed) {
      this.foundation_ = new MDCFixedTopAppBarFoundation(adapter);
    } else {
      this.foundation_ = new MDCTopAppBarFoundation(adapter);
    }

    this.foundation_.init();
  },
  beforeDestroy() {