check if "document" is present (server-side rendering)

[indeyets]

componentDidUpdate() calls dispatchEvent which unconditionally calls document.createEvent('Event');

The problem is that document global is not available when server-side rendering is used (either in isomorphic scenarios or in tests).

Simple if (typeof document !== 'undefined') guard should be enough to fix this

[FrancescoCioria]

Hi @indeyets
As far as I know renderToString (from react-dom/server) calls only componentWillMount, while componentDidMount/Update are called in the client during the hydrate.

Why is componentDidUpdate being called on your server? are you sure?

[indeyets]

Update happens during tests. I noticed issue while checking logs of our test runs actually.

Re-rendering on server-side is not a recommended practice, but not exactly prohibited.

I can find more details later today if you think that is important