svelte-check --tsgo --incremental tsconfig.json "references" inconsistency

[ageorgeh]

Describe the bug

There is an inconsistency in the error reporting of svelte-check with the --tsgo and --incremental flags in projects with "references" in tsconfig.json
In tsgo mode it shows extra errors for references:

Error: Output file '/.../svelte-check-refs/t/dist/src/index.d.ts' has not been built from source file '/.../svelte-check-refs/t/src/index.ts'. (ts)

Reproduction

Follow the README steps in this repo. The differences can be seen in the npm scripts

https://github.com/ageorgeh/svelte-check-repro

Expected behaviour

tsgo and incremental do not give these errors and svelte-check reports the same with or without these flags

System Info

• OS: Linux
• IDE: VSCode

Which package is the issue about?

svelte-check

Additional Information, eg. Screenshots

No response

[jasonlyu123]

The current typescript-go integration/incremental works by extracting errors from the output of the tsgo/tsc command. And the error is because of how tsc works. It needs the referenced project to be built to proceed. For normal svelte-check, it works because it uses a feature that was meant for the editor, but there is no API for us to do that now.