fix: disable prefer-const rule for svelte files as it does not handle deriveds well

Author: dominikg

eslint.config.js

@@ -116,7 +116,8 @@ export default [
 		},
 
 		rules: {
-			'n/no-missing-import': 'off' // n doesn't know some vite specifics or monorepo imports.
+			'n/no-missing-import': 'off', // n doesn't know some vite specifics or monorepo imports.
+			'prefer-const': 'off' // this turns let foo = $derived into a const otherwise
 		}
 	},
 	{

packages/vite-plugin-svelte-inspector/src/runtime/Inspector.svelte

@@ -36,7 +36,7 @@
 
 	let hold_start_ts = $state();
 
-	const show_toggle = $derived(
+	let show_toggle = $derived(
 		options.showToggleButton === 'always' || (options.showToggleButton === 'active' && enabled)
 	);