feat: import svelte types

[bluwy]

Fixes #10

I initially wanted to import the types from svelte directly for every other files, but eslint keeps complaining of node/no-missing-import, and the imports are ugly :D So I've only modified the option.ts file, which re-exports the types needed. Though, let me know if we do want to import from svelte directly, and we could try that path.

I also removed --dts-resolve from tsup. It was unable to resolve estree, likely from Svelte compiler's dependencies. Removing that doesn't change the final dts however, so it looks safe.

[bluwy]

Forgot to mark the exported types with export type which caused these imports to be included in the JS bundle before. Fixed.

[dominikg]

does this actually work? svelte does not export the types, hence the eslint warnings. I thought the first step for this was to make these types public in svelte.

[bluwy]

Yeah it does work. I'm guessing eslint wasn't scanning ts files, hence the errors. They're deep imports though, but it's the only way to import the types, so they sort-off become public APIs (see also sveltejs/svelte#6100). I also did this in the past and it works well.