[typescript] Fix for Popover -> PaperProps typing

[xaviergonz]

This was failing in ts:

 <Popover
  PaperProps={{
    style: {
      backgroundColor: 'rgb(30, 30, 30)'
    }
  }}
  >
    {tooltip}
  </Popover>

[sebald]

@xaviergonz Can you please add a test for the Popover to test/typescript/components.spec.tsx. You can just copy/pase your failing example at the end!

[sebald]

Partial is not needed, but also doesn't hurt, I guess :)

[xaviergonz]

just to be future proof in case paper ever gets a required prop :)

[sebald]

Good thinking.

[oliviertassinari]

@xaviergonz I was waiting for a test case, but in the end, it's always better to have this fix than nothing. Thank you :)

[xaviergonz]

Sorry, I didn't have the time to, just got home from work :-S

[oliviertassinari]

@xaviergonz I understand that it can be hard to find some time to contribute. It's already a step forward. I don't think typing tests are as important as unit tests for our component as the checks are static, you have a very kick feedback loop between breaking one and fixing it. The main issue is around shipping a broken typescript to the users. So, having some is a nice to have :).