fix

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

@@ -23,15 +23,6 @@ export function migrate(source) {
 
 		let parsed = parse(source);
 
-		if (parsed.metadata.ts) {
-			parsed = {
-				...parsed,
-				fragment: parsed.fragment && remove_typescript_nodes(parsed.fragment),
-				instance: parsed.instance && remove_typescript_nodes(parsed.instance),
-				module: parsed.module && remove_typescript_nodes(parsed.module)
-			};
-		}
-
 		const { customElement: customElementOptions, ...parsed_options } = parsed.options || {};
 
 		/** @type {import('#compiler').ValidatedCompileOptions} */

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

@@ -54,9 +54,6 @@ const visitors = {
 	TSTypeAliasDeclaration() {
 		return b.empty;
 	},
-	TSTypeAnnotation() {
-		return b.empty;
-	},
 	TSTypeParameterDeclaration() {
 		return b.empty;
 	},
@@ -65,6 +62,15 @@ const visitors = {
 	},
 	TSEnumDeclaration() {
 		return b.empty;
+	},
+	Identifier(node) {
+		if (node.typeAnnotation) {
+			return {
+				...node,
+				typeAnnotation: null,
+			}
+		}
+		return node;
 	}
 };