| // Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// @assertion An annotation on a JavaScript interop declaration. |
| /// |
| /// This annotation defines a given library, top-level external declaration, or |
| /// extension type as a JavaScript interop declaration. |
| /// |
| /// @description Check that it is a compile-time error if an extension type is |
| /// annotated with `@JS()` but its representation type is not a valid JS interop |
| /// type. |
| /// @author sgrekhov22@gmail.com |
| |
| import 'dart:js_interop'; |
| |
| @JS() |
| extension type ET1<T extends JSAny>(T _) implements JSAny { |
| // ^ |
| // [analyzer] unspecified |
| // [web] unspecified |
| } |
| |
| @JS() |
| extension type ET2(int _) implements num { |
| // ^^^ |
| // [analyzer] unspecified |
| // [web] unspecified |
| } |
| |
| main() { |
| print(ET1); |
| print(ET2); |
| } |
