code: function getSourceData(node, children) {
      const sourceData = node.attribs["data"];
      if (sourceData) {
        return sourceData;
      }
      if (Array.isArray(children) && children.length > 0) {
        return children[0];
      }
      return children;
    }
docs: Returns the 'data' attribute if available, otherwise the child of this node.
  @private