code: function commentNode(el, vnode) {
    const comment = document.createComment(' ')
  
    Object.defineProperty(comment, 'setAttribute', {
      value: () => undefined
    })
  
    vnode.text = ' '
    vnode.elm = comment
    vnode.isComment = true
    vnode.tag = undefined
    vnode.data.directives = undefined
  
    if (vnode.componentInstance) {
      vnode.componentInstance.$el = comment
    }
  
    if (el.parentNode) {
      el.parentNode.replaceChild(comment, el)
    }
  }
docs: Create comment node
  
  @private
  @author https://stackoverflow.com/questions/43003976/a-custom-directive-similar-to-v-if-in-vuejs#43543814