From 669d2d7a1ea8d5eebc61782497e12a0d8a77fd49 Mon Sep 17 00:00:00 2001
From: Simon H <5968653+dummdidumm@users.noreply.github.com>
Date: Fri, 19 Apr 2024 14:03:09 +0200
Subject: [PATCH] fix: preserve getters/setters in HMR mode (#11231)

fixes #11228
---
 .changeset/tender-rocks-walk.md                | 5 +++++
 packages/svelte/src/internal/client/dev/hmr.js | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/tender-rocks-walk.md

diff --git a/.changeset/tender-rocks-walk.md b/.changeset/tender-rocks-walk.md
new file mode 100644
index 0000000000..db290471ca
--- /dev/null
+++ b/.changeset/tender-rocks-walk.md
@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+fix: preserve getters/setters in HMR mode
diff --git a/packages/svelte/src/internal/client/dev/hmr.js b/packages/svelte/src/internal/client/dev/hmr.js
index 3082e47c68..0f79607707 100644
--- a/packages/svelte/src/internal/client/dev/hmr.js
+++ b/packages/svelte/src/internal/client/dev/hmr.js
@@ -28,7 +28,11 @@ export function hmr(source) {
 
 			effect = branch(() => {
 				set_should_intro(false);
-				Object.assign(instance, component(anchor, props));
+				// preserve getters/setters
+				Object.defineProperties(
+					instance,
+					Object.getOwnPropertyDescriptors(component(anchor, props))
+				);
 				set_should_intro(true);
 			});
 		});