fix: fs check in transform middleware

[patak-dev]

Description

Fixes moderate security vulnerabilities reported in GHSA-4r4m-qw57-chr8

[patak-dev]

/ecosystem-ci run

[pkg-pr-new]

Open in Stackblitz

npm i https://pkg.pr.new/vite@19761

commit: b09b03d

[vite-ecosystem-ci]

📝 Ran ecosystem CI on b09b03d: Open

suite	result	latest scheduled
nuxt	✅ success	❌ failure
laravel	❌ failure	✅ success
vite-environment-examples	❌ failure	❌ failure
quasar	✅ success	❌ failure
unocss	✅ success	❌ failure
storybook	✅ success	❌ failure
vite-plugin-vue	✅ success	❌ failure
vite-plugin-svelte	❌ failure	❌ failure
vike	✅ success	❌ failure
sveltekit	❌ failure	✅ success
vuepress	✅ success	❌ failure
vitepress	✅ success	❌ failure

✅ histoire, previewjs, analogjs, rakkas, ladle, qwik, marko, vite-plugin-react, react-router, vite-setup-catalogue, astro, vite-plugin-cloudflare, vite-plugin-react-swc, waku, vite-plugin-pwa, vitest

[patak-dev]

The failures are due to types incompatibilities unrelated to this fix.