Fix SSR (#75, #315)

[danlobo]

Replace broken package 'closest' with polyfill Fix webpack4 'window not an object' (https://stackoverflow.com/questions/55849240/window-is-not-defined-after-a-build-with-webpack)

Checklist

• [x] The code has been run through pretty yarn run pretty
• [x] The tests pass on CircleCI
• [x] You have referenced the issue(s) or other PR(s) this fixes/relates-to
• [x] The PR Template has been filled out (see below)
• [x] Had a beer/coffee because you are awesome

What?

'window is not an object' errors when using server-side.

Why?

Webpack 4 has issues with window object when the context doesn't have it. It works on browser, but not on server-side.

There are workarounds to not change the settings, but involves dynamic imports inside client-side methods (componentDidUpdate / useEffect ).

Custom classes in separated files, like nodes, factories and widgets doesn't work because imports aren't possible.

The package closest relies on Element object, which doesn't exist on server-side context.

How?

This fixes webpack4 issue as seen here.

The closestpackage was removed and replaced with a polyfill.

Feel good image:

[picodoth]

When will this be merged?

[dylanvorster]

I think this was already fixed