From 88dbb7f927ffa5063540222de339bb604015aae0 Mon Sep 17 00:00:00 2001
From: Taku Fukada <naninunenor@gmail.com>
Date: Wed, 18 Dec 2024 16:00:42 +0900
Subject: [PATCH 1/2] fix: remove implements from class declaration

---
 .changeset/calm-maps-cover.md                                | 5 +++++
 .../src/compiler/phases/1-parse/remove_typescript_nodes.js   | 1 +
 2 files changed, 6 insertions(+)
 create mode 100644 .changeset/calm-maps-cover.md

diff --git a/.changeset/calm-maps-cover.md b/.changeset/calm-maps-cover.md
new file mode 100644
index 000000000000..b7bd449c1ade
--- /dev/null
+++ b/.changeset/calm-maps-cover.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: remove implements from class declarations
diff --git a/packages/svelte/src/compiler/phases/1-parse/remove_typescript_nodes.js b/packages/svelte/src/compiler/phases/1-parse/remove_typescript_nodes.js
index 96639829bb60..18c805128dfe 100644
--- a/packages/svelte/src/compiler/phases/1-parse/remove_typescript_nodes.js
+++ b/packages/svelte/src/compiler/phases/1-parse/remove_typescript_nodes.js
@@ -115,6 +115,7 @@ const visitors = {
 		if (node.declare) {
 			return b.empty;
 		}
+		delete node.implements;
 		return context.next();
 	},
 	VariableDeclaration(node, context) {

From 54ba0bb86e37493bbc657968efbc2614a2047cd5 Mon Sep 17 00:00:00 2001
From: Taku Fukada <naninunenor@gmail.com>
Date: Wed, 18 Dec 2024 18:04:04 +0900
Subject: [PATCH 2/2] add a smoke test

---
 .../samples/typescript-class-and-interface/_config.js        | 3 +++
 .../samples/typescript-class-and-interface/main.svelte       | 5 +++++
 2 files changed, 8 insertions(+)
 create mode 100644 packages/svelte/tests/runtime-browser/samples/typescript-class-and-interface/_config.js
 create mode 100644 packages/svelte/tests/runtime-browser/samples/typescript-class-and-interface/main.svelte

diff --git a/packages/svelte/tests/runtime-browser/samples/typescript-class-and-interface/_config.js b/packages/svelte/tests/runtime-browser/samples/typescript-class-and-interface/_config.js
new file mode 100644
index 000000000000..4e8f43d5dbfd
--- /dev/null
+++ b/packages/svelte/tests/runtime-browser/samples/typescript-class-and-interface/_config.js
@@ -0,0 +1,3 @@
+import { test } from '../../assert';
+
+export default test({});
diff --git a/packages/svelte/tests/runtime-browser/samples/typescript-class-and-interface/main.svelte b/packages/svelte/tests/runtime-browser/samples/typescript-class-and-interface/main.svelte
new file mode 100644
index 000000000000..3d58f1072d32
--- /dev/null
+++ b/packages/svelte/tests/runtime-browser/samples/typescript-class-and-interface/main.svelte
@@ -0,0 +1,5 @@
+<script lang="ts">
+  // TypeScript syntax should not cause compilation failure
+  interface MyInterface {}
+  class MyClass implements MyInterface {}
+</script>
\ No newline at end of file