Setting the type to number for log_lvl.

src/routes/+layout.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 /** @type {import('./$types').LayoutData} */
 export let data: any;
-let log_lvl = 0;
+let log_lvl: number = 0;
 // console.log(`ae_ Svelte root +layout data:`, data);
 
 import { onMount } from 'svelte';