Added test showing that styled-calls yield non-functions

[gertsonderby]

I ran into some issues wrt. testing that seemed to be caused by styled components not being JS function type, somehow. Test replication was very easy - a simple styled component is of type 'object'! A quick look at the constructors used did not yield an immediately obvious source, so I submit it here.

[kachkaev]

@gertsonderby the reason why SC are objects is because they are wrapped into React.forwardRef. Why seeing them as functions it necessary for you?

[joeegan]

One reason would be react-redux connect compatibility.

[kachkaev]

Could you please provide an example that does not work for you now?

[joeB2C2]

Slightly more details here: https://spectrum.chat/thread/9b5cc71e-100e-4380-a976-b40166332896

[mxstbr]

As @kachkaev correctly stated, styled components are not functions due to React.forwardRef being used, which returns an object. If that bothers you for whatever reason, please submit an issue with React itself and discuss whether React.forwardRef can use a function under the hood!

One reason would be react-redux connect compatibility.

react-redux has to add support for React.forwardRef components, there's nothing we can do from our side to help this.

[joeB2C2]

OK cool, I'll try and get round to raising a PR for react-redux

[mxstbr]

It seems like they recently did, see reduxjs/react-redux#914

Might just have to upgrade!

[joeB2C2]

Excellent, thanks for looking into it