code: function createTextNode (type, item) {
        var node = parser.createTextNode(type, item.surface_form)
  
        if (options && options.pos) {
          node.data = item
        }
  
        return node
      }
docs: Create TextNode for SymbolNode, PunctuationNode, WhiteSpaceNode and SourceNode with POS.
  @param type
  @param item
  @returns {{type: string, value: *}}