[fix] don't crash Vite dev server on manifest error (#8093)

Author: dummdidumm

.changeset/yellow-taxis-itch.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+[fix] don't crash Vite dev server on manifest error

packages/kit/src/exports/vite/dev/index.js

@@ -49,7 +49,22 @@ export async function dev(vite, vite_config, svelte_config) {
 	}
 
 	async function update_manifest() {
-		({ manifest_data } = await sync.create(svelte_config));
+		try {
+			({ manifest_data } = await sync.create(svelte_config));
+		} catch (error) {
+			console.error(colors.bold().red('Failed to update manifest'));
+			console.error(error);
+			vite.ws.send({
+				type: 'error',
+				err: {
+					message: `Failed to udpate manifest: ${
+						/** @type {Error} */ (error)?.message ?? 'Unknown error'
+					}`,
+					stack: /** @type {Error} */ (error)?.stack ?? ''
+				}
+			});
+			return;
+		}
 
 		manifest = {
 			appDir: svelte_config.kit.appDir,