Enable the use of TypeScript in this repo

[bradenmacdonald]

We're seeing a lot of defaultProps deprecation warnings in the JS console when running MFEs.

Soon we can use the nice react-prop-types-typescript codemod to convert all our propTypes and defaultProps to TypeScript/JS defaults. But before we can do that we need to support TypeScript and convert the .jsx files to .tsx.

This PR:

• Enables TypeScript support
• Adds type stubs for frontend-platform which still doesn't have types; haven't fixed upstream because frontend-base was supposed to do this.
• Converts everything in src/studio-header from JSX to TSX
• Fixes a few minor type warnings that surfaced

This is only a build/test PR; it should not affect the actual runtime code itself, except for one line that I've called out in a comment.

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[bradenmacdonald]

This is the only change that could have a runtime effect. Everything else is just test code / type checking.

But TypeScript correctly pointed out that we weren't passing the required isMobile here. I assume it's correct to just pass it in, but ignoring the real value and passing isMobile: false would be more consistent with how the code worked before.

[brian-smith-tcril]

I agree adding this is the correct choice. I know testing mobile isn't a huge focus for studio, so my assumption is that this is just an issue that hasn't been noticed. Also, if there are any workarounds in MFEs for this it'll be good to be able to clean those up.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.56%. Comparing base (3be690b) to head (9025974).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #604      +/-   ##
==========================================
+ Coverage   68.75%   72.56%   +3.81%     
==========================================
  Files          48       49       +1     
  Lines         432      492      +60     
  Branches       97      100       +3     
==========================================
+ Hits          297      357      +60     
  Misses        132      132              
  Partials        3        3              

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[bradenmacdonald]

@brian-smith-tcril Would you be able to take a look at this?

[brian-smith-tcril]

I'm extremely glad to see typescript support make it into this repo! Thank you so much for this!

[brian-smith-tcril]

I agree adding this is the correct choice. I know testing mobile isn't a huge focus for studio, so my assumption is that this is just an issue that hasn't been noticed. Also, if there are any workarounds in MFEs for this it'll be good to be able to clean those up.