How to use the @material/toolbar/foundation function in @material/toolbar

mounted() {
    this.foundation = new MDCToolbarFoundation({
      addClass: className => {
        this.$set(this.rootClasses, className, true);
      },
      removeClass: className => {
        this.$delete(this.rootClasses, className);
      },
      hasClass: className => {
        return this.$refs.root.classList.contains(className);
      },
      registerScrollHandler: handler => {
        window.addEventListener('scroll', handler);
      },
      deregisterScrollHandler: handler => {
        window.removeEventListener('scroll', handler);
      },
      registerResizeHandler: handler => {