frontend/src/routes/+layout.svelte
<script>
import '../app.css';
import 'preline/dist/preline.js';
import { loadConfig } from '$lib/config/config';
let loading = true;
loadConfig().then(() => {
loading = false;
})
</script>
{#if loading}
loading...
{:else}
<slot data-sveltekit-preload-data="off" />
{/if}