code: function disableTocAnimation (event) {
      var target = event.target || event.srcElement
      if (typeof target.className !== 'string' || target.className.indexOf(options.linkClass) === -1) {
        return
      }
      // Bind to tocLink clicks to temporarily disable highlighting
      // while smoothScroll is animating.
      currentlyHighlighting = false
    }
docs: Disable TOC Animation when a link is clicked.
  @param {Event} event