Async React.renderToString for server-side rendering

It would really help if we could use the async version of the React.renderToString when rendering on the server-side.

app.get('*', function (req, res) {

  Router.run(routes, req.path, (Handler, router) => {
    // var content = React.renderToString(<Handler/>);
    // res.render('index', { content: content });
    React.renderToString(<Handler/>, function(content) {
      res.render('index', { content: content });
    });
});

[gaearon]

There’s new work in this area in https://github.com/facebook/react/pull/20970.

[xpepermint]

Thanks! Following #3009 then.