function convertToElement(templateResult, domHelper = undefined) {
  return convertToElementInternal(templateResult, domHelper);
}
Converts a processed Soy template into a single node. If the rendered
HTML string represents a single node, then that node is returned. Otherwise,
a DIV element is returned containing the rendered nodes.
@param {!SanitizedContent} templateResult The processed template of kind HTML
    or TEXT (which will be escaped).
@param {?googDom.DomHelper=} domHelper The DOM helper used to create DOM
    nodes; defaults to `goog.dom.getDomHelper`.
@return {!Element} Rendered template contents, wrapped in a parent DIV
    element if necessary.