Muuri: SSR: document is not defined

[abhipanda]

During SSR getting document is not defined, it would be great if we can make this global check.

[niklasramo]

Yep, would be nice if Muuri played nice with SSR. I'm not fully sure what that would entail code-wise so if anyone wants to chime in (e.g. in the form of PR) that would be awesome.

[abhipanda]

The idea is to use https://www.npmjs.com/package/global instead of directly using window / document.

Thanks

[niklasramo]

Alrighty, sounds pretty straightforward if that's all what it takes. This would need tests too. Let's see if someone wants to take a stab at this at some point.