Update TypeScript

[ryantrem]

One of my other PRs is failing in the build because the older version of TS we are using (5.1.6) is missing the states property from the ElementInternals WebAPI type (the states property and the its type CustomStateSet are sort of new but supported in all the major browsers). TypeScript 5.5+ has this property and type, so I started trying to update our TypeScript version. However I ran into some problems with deprecated TypeScript APIs used for the path transformation stuff in the build. I tried to fix it (based on some input from the TypeScript team!), but I definitely broke it. So I'm creating a draft PR as a starting point for getting TypeScript updated.

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Reviewer - this PR has made changes to one or more package.json files.

[bjsplat]

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[sebavan]

Is ElementInternals support wide enough considering where the viewer might be used ?

[bjsplat]

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[bjsplat]

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[RaananW]

Wer usually fix these first by adding them manually to the mixins file and then removing them when not needed. Using an API that only exists in a certain typescript version will also force our users to use this version. Otherwise, type check will fail.
I have no problem with updating the version (after making sure everything works as existed), but we have to support older versions as well.

[ryantrem]

Is ElementInternals support wide enough considering where the viewer might be used ?

Yes I think it is ok.
ElementInternals is baseline 2023: https://developer.mozilla.org/en-US/docs/Web/API/ElementInternals
CustomStateSet is baseline 2024: https://developer.mozilla.org/en-US/docs/Web/API/CustomStateSet

If they are missing in a browser, it will just mean annotation elements don't get a reduced opacity when not facing the camera.

[ryantrem]

Wer usually fix these first by adding them manually to the mixins file and then removing them when not needed. Using an API that only exists in a certain typescript version will also force our users to use this version. Otherwise, type check will fail. I have no problem with updating the version (after making sure everything works as existed), but we have to support older versions as well.

I remembered this from one of our previous conversations :) In this case, it is only used as an implementation detail, it is not surfaced through the API at all, so it doesn't show up in the d.ts files. I believe that means it cannot impact consumers of the package.