feat: twoslash-svelte

[Hugos68]

This PR attempts to create twoslash-svelte which is an extension of twoslashthat supports Svelte.

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[Hugos68]

@antfu @orta
A review would be appreiciated, I'm now at a point where I feel confident I have the code working. I was able to copy some code from twoslash-vue as it works similarly (convert source to tsx then typecheck and use sourcemaps to backtrack the original location).

All that's left is tests.

[orta]

From a high level, this looks very cool to me!

[Hugos68]

@antfu This is ready for review btw, not sure if you have missed it as I know you're inbox is quite lengthy.

[Hugos68]

@dominikg, I might need some help as you're one of the maintainers of svelte2tsx correct?
When compiling the tsx coming from svelte2tsx how can I include the .d.ts files? I've tried many methods but can't find a consistent way where the user can install svelte2tsx and the twoslash-svelte package can use those files.

[dominikg]

@dominikg, I might need some help as you're one of the maintainers of svelte2tsx correct?

sorry for not responding sooner. I do not maintain svelte2tsx, @dummdidumm would be the best person to reach out to, you can try #editor-tools-questions on https://svelte.dev/chat

[Hugos68]

No problem, and thanks, will do!

[Hugos68]

@antfu This is ready for review

[PuruVJ]

Side comment, do remember to add svelte to dependencies or peers dependencies or devDependency :)

[Hugos68]

@PuruVJ Good call! Thanks, will do.