Integrated type checking

[brunnerh]

There is an issue for svelte-preprocess that TypeScript errors are not reported during processing (sveltejs/svelte-preprocess#205), but due to the fact that the pre-processor handles sections independently this cannot reliably be done there.

Would it be possible/make sense to perform these type checks in the loader?

[dummdidumm]

Closing this as type-checking is out of scope of the loader. svelte-check is the recommended and officially supported way of doing these kind of checks.