generate types with dts-buddy

[Rich-Harris]

• types for exported functions are declared on the functions themselves, rather than in the .d.ts file
• a types/index.d.ts file is generated with an accompanying types/index.d.ts.map, meaning cmd-click takes you to the implementation

Unfortunately couldn't use the CLI for this because the entry point is a .d.ts file rather than a .js file, so this happens via a new scripts/generate-dts.js module

[dominikg]

This basically duplicates src/public.d.ts into types/index.d.ts with the addition of a sourcemap. Is there a way to get the same result without the sourcemap and all these moving parts? v-p-s types are tiny, if all it takes is changing src/index.d.ts to declare the module in place instead of using declare function i'm fine with that.

[Rich-Harris]

Is there a way to get the same result without the sourcemap and all these moving parts?

Unfortunately not, unless you want to create a sourcemap by hand. Though I think re-exporting from index.js (so the function types are declared inline rather than with declare function) will work in either case.

It does add moving parts and the benefit is more modest in this case since there's really just one giant .d.ts file in src — no pressure to merge this PR, I was largely just curious about what it would look like (and I found a couple of dts-buddy bugs along the way, so it was worthwhile for me). Having cmd-click work properly is nice, but might not be worth the trade-off. Your call

[dominikg]

changed to draft for now until we figure out how to integrate it properly

[dominikg]

closing in favor of https://github.com/sveltejs/vite-plugin-svelte/pull/751