def self.render_to_string(element)
      if !(`typeof ReactDOMServer === 'undefined'`)
        React::RenderingContext.build { `ReactDOMServer.renderToString(#{element.to_n})` } # v0.15+
      elsif !(`typeof React.renderToString === 'undefined'`)
        React::RenderingContext.build { `React.renderToString(#{element.to_n})` }