docs: function revert(h, node) {
      var subtype = node.referenceType
      var suffix = ']'
      var contents
      var head
      var tail
  
      if (subtype === 'collapsed') {
          suffix += '[]'
      } else if (subtype === 'full') {
          suffix += '[' + node.identifier + ']'
      }
  
      if (node.type === 'imageReference') {
          return u('text', '![' + node.alt + suffix)
      }
  
      contents = all(h, node)
      head = contents[0]
  
      if (head && head.type === 'text') {
          head.value = '[' + head.value
      } else {
          contents.unshift(u('text', '['))
      }
  
      tail = contents[contents.length - 1]
  
      if (tail && tail.type === 'text') {
          tail.value += suffix
      } else {
          contents.push(u('text', suffix))
      }
  
      return contents
  }