Documentation

SvelteKit installation guide

Install the local browser package. Merge this into src/routes/+layout.svelte without removing its existing children or slot markup:

<script>
  import { onMount } from 'svelte';
  import { init } from 'analyticfast';
  onMount(() => {
    init({ siteId: 'YOUR_SITE_ID', host: 'https://YOUR_ANALYTICS_HOST' });
  });
</script>

Initialize once, after required consent. onMount only runs in the browser; do not put initialization in a server load function. The tracker detects SPA navigation itself. Use package track for goals and forward attribution IDs to checkout through a validated server action.

Official reference, checked 2026-10-26: Svelte lifecycle hooks.