Add render prop to Conditional

[ferdinandsalis]

Here is my first stab at adding tests and some documentation. I am sure you are still making a few changes for the release, so feel free to discard the pull request or make changes.

[MicheleBertoli]

This is awesome, thank you very much @ferdinandsalis.

I've got just a few questions/considerations but it looks great to me:

• why are we passing { visibile } instead of just visibile? (this is the only thing that prevented me from pressing "merge" straight away : )).
• I suggest we use render props rather than "function as child".
• it's might worth reorganizing the tests and separate the callbacks from the visible (children / render props) and not visible states - I/we can do it later.

[ferdinandsalis]

• Do we ever need to pass in any other data, if not I guess we could just pass the boolean
• Will do. Should we maybe allow both?
• Yes I thought so too. However I am not that apt yet when it comes to testing. Will try, maybe …

Thanks for the feedback!

[MicheleBertoli]

• I would go for the boolean approach, and if we ever need more data we can pass multiple params (unless they become too many :))
• Although I tend to prefer the "function as child" approach, I would go with the render prop (as it seems more common, and it's used in the official React docs)
• Let's consider this a nice to have - I'll be happy to merge and refactor the tests later

Thank you very much one more time.

[MicheleBertoli]

🙌