fix: strip exported TypeScript function overloads (#14458)

fixes #14455

Author: dummdidumm

.changeset/shy-starfishes-type.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: strip exported TypeScript function overloads

packages/svelte/src/compiler/phases/1-parse/remove_typescript_nodes.js

@@ -36,7 +36,11 @@ const visitors = {
 		if (node.exportKind === 'type') return b.empty;
 
 		if (node.declaration) {
-			return context.next();
+			const result = context.next();
+			if (result?.declaration?.type === 'EmptyStatement') {
+				return b.empty;
+			}
+			return result;
 		}
 
 		if (node.specifiers) {

packages/svelte/tests/runtime-runes/samples/typescript/main.svelte

@@ -27,6 +27,10 @@
 		export type Foo = true
 	}
 
+	export function overload(a: boolean): boolean;
+	export function overload(b: string): number;
+	export function overload(c: any): any {}
+
 	export type { Hello };
 </script>