vitest clobbers playwright in a fresh SvelteKit installation.

[kyllerss]

Describe the bug

Installing vitest in a fresh SvelteKit project causes playwright tests to fail with a runtime error. The project's README.md provides the full error report, but a sample of the error message is as follows:

[WebServer] [vite-plugin-svelte] /home/my_home/vitest-playwright-bug/.svelte-kit/runtime/components/layout.svelte:15:1 The keyword 'let' is reserved
file: /home/my_home/vitest-playwright-bug/.svelte-kit/runtime/components/layout.svelte:15:1
 13 |  
 14 |  function create_fragment(ctx) {
 15 |    let current;
         ^
 16 |    const default_slot_template = /*#slots*/ ctx[1].default;
 17 |    const default_slot = create_slot(default_slot_template, ctx, /*$$scope*/ ctx[0], null);
[WebServer] > /home/my_home/vitest-playwright-bug/.svelte-kit/runtime/components/layout.svelte:15:1 The keyword 'let' is reserved
[WebServer] 13: 
14: function create_fragment(ctx) {
15:   let current;
      ^
16:   const default_slot_template = /*#slots*/ ctx[1].default;
17:   const default_slot = create_slot(default_slot_template, ctx, /*$$scope*/ ctx[0], null);
    at error (file:///home/my_home/vitest-playwright-bug/node_modules/svelte/compiler.mjs:17716:19)
...

Reproduction

I have created a public repo that illustrates the problem:

https://github.com/kyllerss/vitest-playwright-bug

The commit history is clean to illustrate where things break.

System Info

Fresh SvelteKit installation w/ Typescript + Playwright.

Used Package Manager

npm

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]

Please, follow SvelteKit support here: sveltejs/kit#5094

[benmccann]

@sveltejs/kit/experimental/vite has been released in @sveltejs/kit version 1.0.0-next.353. Feedback welcome in sveltejs/kit#5184

[kyllerss]

The issue has shifted now. I will file a separate bug report as I think the issue now lies elsewhere. Considering this closed.