docs: function(constructor, props, id) {
      var domNode = document.getElementById(id);
      ("production" !== process.env.NODE_ENV ? invariant(
        domNode,
        'Tried to get element with id of "%s" but it is not present on the page.',
        id
      ) : invariant(domNode));
      return ReactMount.constructAndRenderComponent(constructor, props, domNode);
    }