Cannot import @auth/sveltekit in Vitest

[Stadly]

Environment

  System:
    OS: Linux 6.5 Ubuntu 20.04.6 LTS (Focal Fossa)
    CPU: (2) x64 Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz
    Memory: 5.56 GB / 7.74 GB
    Container: Yes
    Shell: 5.0.17 - /bin/bash
  Binaries:
    Node: 20.17.0 - ~/nvm/current/bin/node
    Yarn: 1.22.22 - /usr/bin/yarn
    npm: 10.8.2 - ~/nvm/current/bin/npm
    pnpm: 9.11.0 - ~/nvm/current/bin/pnpm
  npmPackages:
    @auth/sveltekit: latest => 1.7.4 
    @sveltejs/kit: 2.5.7 => 2.5.7 
    svelte: 4.2.19 => 4.2.19 

Reproduction URL

https://github.com/Stadly/reproduction/tree/auth.js/sveltekit-vitest-failing

Describe the issue

When using browser resolution, which is the way to go, Vitest fails when importing @auth/sveltekit:

SyntaxError: Named export 'jsx' not found. The requested module 'preact/jsx-runtime' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:

import pkg from 'preact/jsx-runtime';
const { jsx: _jsx, jsxs: _jsxs } = pkg;

 ❯ node_modules/@auth/sveltekit/dist/env.js:1:31
      1| import { setEnvDefaults as coreSetEnvDefaults, skipCSRFCheck } from "@auth/core";
       |                               ^
      2| import { dev, building } from "$app/environment";
      3| import { base } from "$app/paths";

How to reproduce

1. Set up Vitest and Svelte Testing Library
2. Set up Auth.js
3. Create a test importing @auth/sveltekit

import { SvelteKitAuth } from "@auth/sveltekit"; // <-- This fails!
import { it } from "vitest";

it("test auth in some way", () => {
   // ... 
});

With the reproduction URL, just run npm run i && npm run test to see the issue.

Expected behavior

Importing @auth/sveltekit should not cause any issues with Vitest.