[TextareaAutosize][base] Convert code to TypeScript

[michaldudak]

Convert the TextareaAutosize and related modules (everything inside mui-base/src/TextareaAutosize) to TypeScript, to increase consistency with other MUI Base components.
There should be no functional changes.
Use other components as a reference.

[ryanrw]

@michaldudak I think I can take this task. Could you assign to me, please?

[michaldudak]

Sure, go ahead!

[ryanrw]

I need help with with some piece of code inside the TextareaAutoSize.

The component contains inputRef and shadowRef, which is React's ref.

React.useRef(null);

Is it a good practice that I use non-null assertion on the variable assignment like this?

const inputShallow = shadowRef.current;
// here I put the non-null assertion to resolve TS typecheck
inputShallow!.style.width = computedStyle.width;

It will resolve the TypeScript typecheck error warning, but I don't know if ref can be null.

Thank you for your help.

[michaldudak]

Yes, you could do it. This ref is null only initially. We would get runtime errors otherwise.

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I see @paco9595 has also started working on this in #34751. Could you please coordinate your efforts? As @ryanrw was assigned to this issue, I'd prefer his implementation to be merged, but we can have @paco9595's PR as a fallback.

[ryanrw]

@michaldudak It's ok to merge #34751 work first, since I'm tried to type safe if I'm possible to do so. (It's also holiday here, sorry for late work 😅)

[ryanrw]

@michaldudak I just review on #34751 and I think his work is as same as mine, so it's ok to using his work instead.

[sai6855]

@michaldudak created PR which closes this issue #35862