Imported module CSS file missing on Vercel only

[carstenjaksch]

In a Svelte component, I import the corresponding stylesheet like so:

<script>
	import { onMount } from 'svelte';
	import * as CookieConsent from 'vanilla-cookieconsent';
	import config from '$lib/gdpr/cookieconsent-config';
	import 'vanilla-cookieconsent/dist/cookieconsent.css'; // <- this

	const { run, showPreferences } = CookieConsent;

	onMount(() => {
		run(config);
	});
</script>

<button on:click={showPreferences}>Cookies</button>

It works flawless on localhost, but on Vercel the stylesheet is missing. Any idea how to get that imported during Vercel build?

I would prefer to keep it inside the component.