Fix Vitepreprocess for components using scss (npm run build doesnt finish compiling)

[EAlexis92]

Describe the bug

When using vitepreprocess (SSR) for components using <style lang="scss"></style> it never finishes compiling unless you kill dart.exe (this is not a fix). You have to use the deprecated sveltePreprocess({` sass: true }), because all projects just never deploy in the hosting. There are other 2 issues about this that were never addressed months ago.

import adapter from '@sveltejs/adapter-vercel';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
import sveltePreprocess from 'svelte-preprocess';
import path from 'path'

/** @type {import('@sveltejs/kit').Config} */

const config = {
	preprocess: vitePreprocess(),
	kit: {
        adapter: adapter({
			// // default options are shown. On some platforms
			// // these options are set automatically — see below
			// pages: 'build',
			// assets: 'build',
			// fallback: undefined,
			// precompress: false,
			// strict: true
			runtime: 'nodejs22.x',
		}),
        alias: {
            $houdini: path.resolve('.', '$houdini')
        },
	prerender: {
		handleHttpError: ({ path, referrer, message }) => {
			// ignore deliberate link to shiny 404 page
			if (path === '/not-found' && referrer === '/blog/how-we-built-our-404-page') {
				return;
			}

			// otherwise fail the build
			throw new Error(message);
		}
	}
    }
};

export default config;

Here is an image of the issue locally:

An example in firebase (I am not using this hosting, just a test 50 minutes have passed):

My official host in vercel (same thing):

Reproduction

npm run build

Logs

.svelte-kit/output/server/chunks/utils.js                              36.48 kB
.svelte-kit/output/server/chunks/_page.js                             101.49 kB
.svelte-kit/output/server/index.js                                    104.56 kB
.svelte-kit/output/server/entries/pages/_page.svelte.js               190.14 kB
✓ built in 16.29s
Run npm run preview to preview your production build locally.
> Using @sveltejs/adapter-vercel
  ✔ done
> online-store@0.0.1 prepack
> svelte-kit sync && svelte-package && publint
src/lib -> dist

System Info

System:
    OS: Windows 10 10.0.19045
    CPU: (8) x64 Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
    Memory: 1.80 GB / 15.88 GB
  Binaries:
    Node: 22.16.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.22 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 11.1.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Chromium (133.0.3065.82)

Severity

blocking all usage of svelte