code: function autoLinkifyHelper(node) {
    if (typeof node === 'string') {
      return hyperLinkifiedVersion(node);
    } else if (
      ['a', 'code', 'pre', 'equation'].indexOf(getNodeName(node).toLowerCase()) >
      -1
    ) {
      return node;
    } else {
      return modifyChildren(node, autoLinkifyHelper);
    }
  }
docs: Helper function for autoLinkify to check the type of node and modify them if necessary.
  @param {*} node    node to be checked and modified if necessary.
  @return modified node, if modification was required, else returns node.