From 94efa638415ec68b7965d3d3bbcab3828a8cd112 Mon Sep 17 00:00:00 2001
From: paoloricciuti <ricciutipaolo@gmail.com>
Date: Fri, 18 Apr 2025 16:10:28 +0200
Subject: [PATCH 1/3] fix: `update_version` after `delete` if `source` is
 `undefined` and `prop` in `target`

---
 .changeset/great-colts-film.md                  |  5 +++++
 packages/svelte/src/internal/client/proxy.js    |  1 +
 .../samples/delete-proxy-key/_config.js         | 17 +++++++++++++++++
 .../samples/delete-proxy-key/main.svelte        | 12 ++++++++++++
 svelte-renderer-api                             |  1 +
 5 files changed, 36 insertions(+)
 create mode 100644 .changeset/great-colts-film.md
 create mode 100644 packages/svelte/tests/runtime-runes/samples/delete-proxy-key/_config.js
 create mode 100644 packages/svelte/tests/runtime-runes/samples/delete-proxy-key/main.svelte
 create mode 160000 svelte-renderer-api

diff --git a/.changeset/great-colts-film.md b/.changeset/great-colts-film.md
new file mode 100644
index 000000000000..273509c107e8
--- /dev/null
+++ b/.changeset/great-colts-film.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: `update_version` after `delete` if `source` is `undefined` and `prop` in `target`
diff --git a/packages/svelte/src/internal/client/proxy.js b/packages/svelte/src/internal/client/proxy.js
index d690790e3a78..fd5706eaf270 100644
--- a/packages/svelte/src/internal/client/proxy.js
+++ b/packages/svelte/src/internal/client/proxy.js
@@ -100,6 +100,7 @@ export function proxy(value) {
 						prop,
 						with_parent(() => source(UNINITIALIZED, stack))
 					);
+					update_version(version);
 				}
 			} else {
 				// When working with arrays, we need to also ensure we update the length when removing
diff --git a/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/_config.js b/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/_config.js
new file mode 100644
index 000000000000..0149502e9ec9
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/_config.js
@@ -0,0 +1,17 @@
+import { ok, test } from '../../test';
+import { flushSync } from 'svelte';
+
+export default test({
+	html: `<button></button><p>test</p>`,
+
+	async test({ assert, target, instance }) {
+		const btn = target.querySelector('button');
+		let p = target.querySelector('p');
+		assert.equal(p?.innerHTML, 'test');
+		flushSync(() => {
+			btn?.click();
+		});
+		p = target.querySelector('p');
+		assert.equal(p, undefined);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/main.svelte b/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/main.svelte
new file mode 100644
index 000000000000..458c25d5a651
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/main.svelte
@@ -0,0 +1,12 @@
+<script>
+	let obj = $state({test: 0})
+
+	let keys = $derived(Object.keys(obj));
+</script>
+
+<button onclick={()=>{
+	delete obj.test;
+}}></button>
+{#each keys as key}
+	<p>{key}</p>
+{/each}
\ No newline at end of file
diff --git a/svelte-renderer-api b/svelte-renderer-api
new file mode 160000
index 000000000000..97817a95d6fa
--- /dev/null
+++ b/svelte-renderer-api
@@ -0,0 +1 @@
+Subproject commit 97817a95d6fa2d3f72c03f04a1e0882a7650cd16

From 3e432d36fd2bc0537884e9967afeb659d68be8e9 Mon Sep 17 00:00:00 2001
From: paoloricciuti <ricciutipaolo@gmail.com>
Date: Fri, 18 Apr 2025 16:16:01 +0200
Subject: [PATCH 2/3] chore: remove submodule

---
 svelte-renderer-api | 1 -
 1 file changed, 1 deletion(-)
 delete mode 160000 svelte-renderer-api

diff --git a/svelte-renderer-api b/svelte-renderer-api
deleted file mode 160000
index 97817a95d6fa..000000000000
--- a/svelte-renderer-api
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 97817a95d6fa2d3f72c03f04a1e0882a7650cd16

From 57c73350364c87e5168d5214846b0f7a4144cdcf Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Fri, 18 Apr 2025 11:46:42 -0400
Subject: [PATCH 3/3] tweak test

---
 .../samples/delete-proxy-key/_config.js          | 16 ++++++----------
 .../samples/delete-proxy-key/main.svelte         |  9 +++++----
 2 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/_config.js b/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/_config.js
index 0149502e9ec9..23141a01cd86 100644
--- a/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/_config.js
+++ b/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/_config.js
@@ -1,17 +1,13 @@
-import { ok, test } from '../../test';
+import { test } from '../../test';
 import { flushSync } from 'svelte';
 
 export default test({
-	html: `<button></button><p>test</p>`,
+	html: `<button>delete</button><p>test</p>`,
 
-	async test({ assert, target, instance }) {
+	async test({ assert, target }) {
 		const btn = target.querySelector('button');
-		let p = target.querySelector('p');
-		assert.equal(p?.innerHTML, 'test');
-		flushSync(() => {
-			btn?.click();
-		});
-		p = target.querySelector('p');
-		assert.equal(p, undefined);
+
+		flushSync(() => btn?.click());
+		assert.htmlEqual(target.innerHTML, '<button>delete</button>');
 	}
 });
diff --git a/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/main.svelte b/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/main.svelte
index 458c25d5a651..d3c519c401c8 100644
--- a/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/main.svelte
+++ b/packages/svelte/tests/runtime-runes/samples/delete-proxy-key/main.svelte
@@ -4,9 +4,10 @@
 	let keys = $derived(Object.keys(obj));
 </script>
 
-<button onclick={()=>{
-	delete obj.test;
-}}></button>
+<button onclick={() => delete obj.test}>
+	delete
+</button>
+
 {#each keys as key}
 	<p>{key}</p>
-{/each}
\ No newline at end of file
+{/each}