1 files changed, 16 insertions, 6 deletions
diff --git a/packages/integrations/svelte/client-v5.js b/packages/integrations/svelte/client-v5.js
index fda68ee54..78bab3ea3 100644
--- a/packages/integrations/svelte/client-v5.js
+++ b/packages/integrations/svelte/client-v5.js
@@ -1,5 +1,7 @@
 import { createRawSnippet, hydrate, mount, unmount } from 'svelte';
 
+const existingApplications = new WeakMap();
+
 export default (element) => {
 	return async (Component, props, slotted, { client }) => {
 		if (!element.hasAttribute('ssr')) return;
@@ -21,15 +23,23 @@ export default (element) => {
 		}
 
 		const bootstrap = client !== 'only' ? hydrate : mount;
-
-		const component = bootstrap(Component, {
-			target: element,
-			props: {
+		if (existingApplications.has(element)) {
+			existingApplications.get(element).$set({
 				...props,
 				children,
 				$$slots,
-			},
-		});
+			});
+		} else {
+			const component = bootstrap(Component, {
+				target: element,
+				props: {
+					...props,
+					children,
+					$$slots,
+				},
+			});
+			existingApplications.set(element, component);
+		}
 
 		element.addEventListener('astro:unmount', () => unmount(component), { once: true });
 	};