From 542cda3f6853838ea18cf8465a4d14c809829915 Mon Sep 17 00:00:00 2001
From: tomoam <29677552+tomoam@users.noreply.github.com>
Date: Thu, 13 Feb 2025 18:54:23 +0900
Subject: [PATCH 1/3] fix: prevent writable store value from becoming a proxy
 when reassigning using $ prefix

---
 .../client/visitors/AssignmentExpression.js           |  1 +
 .../samples/store-reassign-object/_config.js          | 10 ++++++++++
 .../samples/store-reassign-object/main.svelte         | 11 +++++++++++
 3 files changed, 22 insertions(+)
 create mode 100644 packages/svelte/tests/runtime-runes/samples/store-reassign-object/_config.js
 create mode 100644 packages/svelte/tests/runtime-runes/samples/store-reassign-object/main.svelte

diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/AssignmentExpression.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/AssignmentExpression.js
index 0c70f7e00cda..a8c615af936f 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/AssignmentExpression.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/AssignmentExpression.js
@@ -118,6 +118,7 @@ function build_assignment(operator, left, right, context) {
 			binding.kind !== 'prop' &&
 			binding.kind !== 'bindable_prop' &&
 			binding.kind !== 'raw_state' &&
+			binding.kind !== 'store_sub' &&
 			context.state.analysis.runes &&
 			should_proxy(right, context.state.scope) &&
 			is_non_coercive_operator(operator)
diff --git a/packages/svelte/tests/runtime-runes/samples/store-reassign-object/_config.js b/packages/svelte/tests/runtime-runes/samples/store-reassign-object/_config.js
new file mode 100644
index 000000000000..3cded0a7e0a4
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/store-reassign-object/_config.js
@@ -0,0 +1,10 @@
+import { test } from '../../test';
+
+export default test({
+	async test({ target, assert }) {
+		assert.htmlEqual(
+			target.innerHTML,
+			`<p>bar</p>`
+		);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/store-reassign-object/main.svelte b/packages/svelte/tests/runtime-runes/samples/store-reassign-object/main.svelte
new file mode 100644
index 000000000000..ecffbb2d837c
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/store-reassign-object/main.svelte
@@ -0,0 +1,11 @@
+<script>
+	import { writable } from "svelte/store";
+
+	const obj = writable({ name: 'foo' });
+
+	$obj = { name: 'bar' };
+
+	const clone = structuredClone($obj);
+</script>
+
+<p>{clone.name}</p>

From 8b326b0ea77a2614869212c05e2832d531025010 Mon Sep 17 00:00:00 2001
From: tomoam <29677552+tomoam@users.noreply.github.com>
Date: Thu, 13 Feb 2025 19:09:59 +0900
Subject: [PATCH 2/3] format

---
 .../runtime-runes/samples/store-reassign-object/_config.js   | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/packages/svelte/tests/runtime-runes/samples/store-reassign-object/_config.js b/packages/svelte/tests/runtime-runes/samples/store-reassign-object/_config.js
index 3cded0a7e0a4..f9a329889d21 100644
--- a/packages/svelte/tests/runtime-runes/samples/store-reassign-object/_config.js
+++ b/packages/svelte/tests/runtime-runes/samples/store-reassign-object/_config.js
@@ -2,9 +2,6 @@ import { test } from '../../test';
 
 export default test({
 	async test({ target, assert }) {
-		assert.htmlEqual(
-			target.innerHTML,
-			`<p>bar</p>`
-		);
+		assert.htmlEqual(target.innerHTML, `<p>bar</p>`);
 	}
 });

From 5aa2b7c8b5105940bfbaaf7d755ac0cf8cf8e90c Mon Sep 17 00:00:00 2001
From: tomoam <29677552+tomoam@users.noreply.github.com>
Date: Thu, 13 Feb 2025 19:16:05 +0900
Subject: [PATCH 3/3] add changeset

---
 .changeset/lovely-chairs-compete.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/lovely-chairs-compete.md

diff --git a/.changeset/lovely-chairs-compete.md b/.changeset/lovely-chairs-compete.md
new file mode 100644
index 000000000000..d311a3dde6f0
--- /dev/null
+++ b/.changeset/lovely-chairs-compete.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: prevent writable store value from becoming a proxy when reassigning using $-prefix