doesn't work with yarn pnp

it looks for node_modules even when installed using yarn in pnp mode... I know, total edge case. 


```
Error [ERR_MODULE_NOT_FOUND]: Cannot find package '@vitejs/plugin-react' imported from /Users/.../vitest.config.mts.timestamp-1731610634973-70c1fdc39fd33.mjs
```

```
"devDependencies": ...
    "@vitejs/plugin-react": "^4.3.1",
```