renderText(template, templateData = undefined) {
    return soy.renderAsText(template, templateData, this.getInjectedData_());
  }
Renders a strict Soy template of kind="text" and returns the output string.
It is an error to use renderText on templates of kinds other than "text".
@param {function(ARG_TYPES, ?Object<string,*>=): string} template The Soy
    template to render.
@param {ARG_TYPES=} templateData The data for the template.
@return {string} The return value of rendering the template directly.
@template ARG_TYPES