fix: snippets with TS incorrect transformation

[paoloricciuti]

After sveltejs/svelte#12070 the AST for the SnippetBlock has changed (to be more correct).

The problem is that svelte2tsx was using that wrong information for the transformation. This means that currently last version of svelte produces wrong ts code from svelte2tsx.

The problem is that before parameter end was including the typeAnnotation

while now it stops where it should (at the parameter)

this PR fixes this problem by looking at the end of typeAnnotation if there's one and falling back to the end of the parameter otherwise.

I tried to update a test but despite messing with the expected to make it fail it was still passing so i think i need a bit of guidance over this (sorry).

Also currently there's one failing test for the language server (in the SemanticTokenProvider so i have to check what's that.

Ok by debugging the language server it seems like the type semantic tokens are lost in the snippet...will try to fix

Lol scratch last one it was failing in master too, i just needed a pnpm i

[paoloricciuti]

Ok this should be ready...however ci is failing here and not locally for something seemingly unrelated. Maybe it's a flaky?

[jasonlyu123]

Yes, it's a flaky test. I only saw it once or twice locally so haven't figured out what the problem is 😅.