Svelte Check Monorepo

Repo to illustrate how it's not possible to exclude certain files. This example is highly simplistic, just enough complexity to show the problem.

Overview

In this monorepo, we have 2 projects.

1. svelte-project - a sveltekit project, it has the default verbatimModuleSyntax of true.
2. project-1 - a lib that svelte-project imports. It's tsconfig sets verbatimModuleSyntax to false.

The tsconfig.base.json in the root of the project details the import alias for project-1, so that svelte-project can import it as @project/first to treat it like an external dependency, but in reality it exists in the same repo.

The svelte.config.ts file reads the tsconfig.base.json, adjusts the paths so they match the location as the .svelte-kit/tsconfig.json will expect them. It then combines the paths from that base config to the one svelte uses.

The vite.config.ts file does a similar thing, where it tells vite how to resolve the @project/first at it's actual location.

Set up

1. Ensure you have node >= 18 installed
2. Clone down this repo
3. npm install in the svelte-project directory

Running svelte-check

To run the basic version, in the svelte-project folder, run:

$ npm run check

> [email protected] check:with-exclude
> svelte-kit sync && svelte-check --tsconfig ./tsconfig-exclude.json


====================================
Loading svelte-check in workspace: /Users/blade/workspace/svelte-check-monorepo/svelte-project
Getting Svelte diagnostics...

/<absolute-path-here>/svelte-check-monorepo/svelte-project/../project-1/src/index.ts:1:10
Error: 'MyType' is a type and must be imported using a type-only import when 'verbatimModuleSyntax' is enabled. 
import { MyType } from './types'



====================================
svelte-check found 1 error and 0 warnings in 1 file

If you try running a version of the check command that uses a tsconfig that explicitly tries to exclude the project-1 directory, you get the same thing:

$ npm run check:with-exclude

> [email protected] check:with-exclude
> svelte-kit sync && svelte-check --tsconfig ./tsconfig-exclude.json


====================================
Loading svelte-check in workspace: /Users/blade/workspace/svelte-check-monorepo/svelte-project
Getting Svelte diagnostics...

/<absolute-path-here>/svelte-check-monorepo/svelte-project/../project-1/src/index.ts:1:10
Error: 'MyType' is a type and must be imported using a type-only import when 'verbatimModuleSyntax' is enabled. 
import { MyType } from './types'



====================================
svelte-check found 1 error and 0 warnings in 1 file

Expectation

My expectation is that the separate project-1 project, with it's own TSConfig, should not error, but I don't know how to configure the svelte-check command to skip checks for it or use the own project's tsconfig for evaluating it.