[Modal] Convert code to typescript

[leventdeniz]

• [x] I have followed (at least) the PR section of the contributing guide.

closes #34716

[leventdeniz]

Thank you for your review, I will work on these on the weekend!

[mui-bot]

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[leventdeniz]

I can't seem to get these last two type errors solved. Maybe someone could help me with them.

[michaldudak]

Do you need any help resolving merge conflicts or making CI checks green?

Regarding type errors, you need to cast the const ModalUnstyled to OverridableComponent<ModalUnstyledTypeMap> as React.forwardRef messes up the generics. The proper definition of types should allow for the removal of the last @ts-expect-error in ModalUnstyled.spec.tsx.

[leventdeniz]

I did what you suggested but this somehow gave me even more errors in the ModalUnstyled.test.tsx. Thank you for your patience but I think I need help resolving these last few errors.

[michaldudak]

You have done the majority of hard work, thanks! The remaining issue was missing types of React.createRef. I added them. I also removed one of the tests as prop forwarding is already being tested in describeConformanceUnstyled.

[leventdeniz]

Thank you so much for your patience and help, I really appreciate it!

[michaldudak]

Thank you for contributing! Feel free to tackle any other issues.