From b874e049de0aea0948dab7a1016f3fb0d54c91a8 Mon Sep 17 00:00:00 2001
From: ComputerGuy <63362464+Ocean-OS@users.noreply.github.com>
Date: Fri, 13 Jun 2025 19:02:11 -0700
Subject: [PATCH 1/2] fix: prune typescript class field declarations

---
 .changeset/neat-lemons-occur.md                     |  5 +++++
 .../phases/1-parse/remove_typescript_nodes.js       | 13 +++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 .changeset/neat-lemons-occur.md

diff --git a/.changeset/neat-lemons-occur.md b/.changeset/neat-lemons-occur.md
new file mode 100644
index 000000000000..53d77ed7644d
--- /dev/null
+++ b/.changeset/neat-lemons-occur.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: prune typescript class field 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 aba94ee20db4..cb498c3c131a 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 +115,19 @@ const visitors = {
 	TSDeclareFunction() {
 		return b.empty;
 	},
+	ClassBody(node, context) {
+		const body = [];
+		for (const _child of node.body) {
+			const child = context.visit(_child);
+			if (child.type !== 'PropertyDefinition' || !child.declare) {
+				body.push(child);
+			}
+		}
+		return {
+			...node,
+			body
+		};
+	},
 	ClassDeclaration(node, context) {
 		if (node.declare) {
 			return b.empty;

From b701b3b95a9743861cf0053424418335410cc6b5 Mon Sep 17 00:00:00 2001
From: ComputerGuy <63362464+Ocean-OS@users.noreply.github.com>
Date: Sat, 14 Jun 2025 02:01:57 -0700
Subject: [PATCH 2/2] add test

---
 .../svelte/tests/runtime-runes/samples/typescript/main.svelte    | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/svelte/tests/runtime-runes/samples/typescript/main.svelte b/packages/svelte/tests/runtime-runes/samples/typescript/main.svelte
index d1b6452df465..4fc7c4ec38d9 100644
--- a/packages/svelte/tests/runtime-runes/samples/typescript/main.svelte
+++ b/packages/svelte/tests/runtime-runes/samples/typescript/main.svelte
@@ -14,6 +14,7 @@
 
 	class Foo<T> {
 		public name: string;
+		declare bar: string;
 		x = 'x' as const;
 		constructor(name: string) {
 			this.name = name;