Failed to load url error when using sveltekit and jsdom environment (0.34.1)

[EugeneDraitsev]

Describe the bug

I have "Failed to load url" error when using sveltekit and jsdom environment for setupFiles file. It works fine with vitest 0.33, this error appear only in vitest 0.34.1

Reproduction

1. Create empty sveltekit project with vitest npm create svelte@latest my-app or clone my repo with all dependencies and files: https://github.com/EugeneDraitsev/vitest-setup-files-bug
2. Add jsdom to dependencies, add empty setupTest.ts and use following vite.config.ts

export default defineConfig({
	plugins: [sveltekit()],
	test: {
		include: ['src/**/*.{test,spec}.{js,ts}'],
		environment: 'jsdom',
		setupFiles: './setupTest.ts'
	}
});

3. Run yarn test and see "Failed to load url" error

If you comment environment: 'jsdom', or downgrade vitest to 0.33.0, then it will work fine

System Info

System:
    OS: Windows 10 10.0.22621
    CPU: (24) x64 13th Gen Intel(R) Core(TM) i7-13700KF
    Memory: 13.58 GB / 31.82 GB
  Binaries:
    Node: 18.15.0 - ~\scoop\apps\nvm\current\nodejs\nodejs\node.EXE
    Yarn: 1.22.19 - ~\scoop\apps\yarn\current\bin\yarn.CMD
    npm: 9.5.0 - ~\scoop\apps\nvm\current\nodejs\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.22621.1992.0), Chromium (115.0.1901.188)
    Internet Explorer: 11.0.22621.1

Used Package Manager

yarn

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[sheremet-va]

Previously Vitest was running in SSR mode even if environment was JSDOM.

Vite doesn't allow accessing files outside of the root folder by default. Since 0.34.0, Vitest uses web mode to load all files inside a test suite, and because of this Vite fallbacks to fs.allow rules. You need to allow files outside of root to be served manually:

export default defineConfig({
	plugins: [sveltekit()],
	test: {
		include: ['src/**/*.{test,spec}.{js,ts}'],
		environment: 'jsdom',
		setupFiles: './setupTest.ts'
	},
	server: {
		fs: {
			allow: ['./setupTest.ts']
		}
	}
});

For security concerns, it's probably better to check for process.env.VITEST when allowing those files to be server:

   {
		fs: {
			allow: process.env.VITEST ? ['./setupTest.ts'] : undefined
		}
	}

[sheremet-va]

We should probably add those files on the Vitest side, actually.

[EugeneDraitsev]

Thank you for explanation! It works fine with server configuration