feat: svelte-check --incremental / --tsgo

[dummdidumm]

Adds two new flags:

• --incremental: Opts into TypeScript's incremental build cache, which speeds up subsequent runs. Saved within .svelte-kit or if not available within .svelte-check. This might result in slightly different type check outcomes, and certain patterns are not supported. Specifically, anything that is not in the root dir of your tsconfig.json and is a Svelte file will not be properly loaded and type-checked.
• --tsgo: Use TypeScript's Go implementation. Needs to have @typescript/native-preview installed. Subject to the same limitations as --incremental

Part of #2733
closes #2131

Huge kudos to @astralhpi for building https://github.com/astralhpi/svelte-fast-check and @pheuter for building https://svelte-check-rs.vercel.app/ , both of which heavily inspired this PR

[changeset-bot]

🦋 Changeset detected

Latest commit: dba2c40

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
svelte-check	Minor
svelte2tsx	Patch
svelte-language-server	Patch
typescript-svelte-plugin	Patch

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[pheuter]

Love it ❤️

[jasonlyu123]

Found a few problems.

This one also needs to change to JSDoc. Feel like there are still other places like this, but it's indeed kind of hard to check.

language-tools/packages/svelte2tsx/src/htmlxtojsx_v2/nodes/SnippetBlock.ts

Line 128 in 12e141d

surroundWithIgnoreComments(`: ReturnType<import('svelte').Snippet>`), // shows up nicely preserved on hover, other alternatives don't

There is also a problem with relative imports from svelte files. Maybe we should also add the original project root to the rootDir of the generated tsconfig.json.

[jasonlyu123]

The jsdoc changes look good.

There is also a problem with relative imports from svelte files

About this. I meant the relative import from svelte files to js/ts files. js/ts files aren't copied to the .svelte-check directory, so relative import failed.

[dummdidumm]

relative import issue should be fixed

[jasonlyu123]

Is --tsgo intended to be only used alongside --incremental? Right now, if you only use --tsgo, the flag seems to be ignored.

[dummdidumm]

fixed

[pheuter]

Noticing a lot of implicit any errors when passing --incremental --tsgo, does it currently support Zero-effort type safety? https://svelte.dev/blog/zero-config-type-safety

/cc @dummdidumm

[ceifa]

Noticing a lot of implicit any errors when passing --incremental --tsgo, does it currently support Zero-effort type safety? https://svelte.dev/blog/zero-config-type-safety

Yep, same here. And other errors like: Error: Cannot find name '__sveltets_2_any'. (ts)