Typescript 4.5.2 errors with svelte-check

[frederikhors]

Describe the bug

Upgrading from "typescript": "4.4.4" to "typescript": "4.5.2" I get many many errors in my code base using svelte-check --tsconfig ./tsconfig.json.

Do you know this?

[dummdidumm]

This is an TypeScript issue, I created microsoft/TypeScript#46860 for that. I also created sveltejs/svelte#6937 which would solve this independently on our end. Don't use TS 4.5.x in the meantime.

[dummdidumm]

This is fixed on our end through sveltejs/svelte#6937 . Update Svelte to the latest version and the errors should go away. Keeping this open for more visibility for others and while it's not fixed in TS itself as a reminder to wait a little before doing the next language tools release which would bumping the TS version.

[dummdidumm]

This was fixed upstream in TS 4.5.3