fix: exclude type-only props from instance exports when migrating (#13485)

Author: Rich-Harris

.changeset/seven-wombats-retire.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: exclude type-only props from instance exports when migrating

packages/svelte/src/compiler/migrate/index.js

@@ -273,7 +273,7 @@ export function migrate(source) {
 		if (state.props.length > 0 && state.analysis.accessors) {
 			str.appendRight(
 				insertion_point,
-				`\n${indent}export {${state.props.reduce((acc, prop) => (prop.slot_name ? acc : `${acc}\n${indent}\t${prop.local},`), '')}\n${indent}}\n`
+				`\n${indent}export {${state.props.reduce((acc, prop) => (prop.slot_name || prop.type_only ? acc : `${acc}\n${indent}\t${prop.local},`), '')}\n${indent}}\n`
 			);
 		}
 

packages/svelte/tests/migrate/samples/accessors/output.svelte

@@ -9,14 +9,12 @@
 	}
 
 	let {
-		test,
 		count = 0,
 		stuff,
 		cool
 	}: Props = $props();
 
 	export {
-		test,
 		count,
 		stuff,
 	}