LibTest/js_interop/FunctionToJSExportedDartFunction/toJS_A02_t01.dart

// 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 JSExportedDartFunction get toJS
/// ...
/// If the static type of the [Function] could not be determined or if the
/// static type uses types that are disallowed, the call will fail to compile.
/// See https://dart.dev/interop/js-interop/js-types#requirements-on-external-declarations-and-function-tojs
/// for more details on what types are allowed.
///
/// @description Check that it is a compile-time error if the static type of the
/// [Function]  could not be determined or if the static type uses types that
/// are disallowed.
/// @author sgrekhov22@gmail.com

import 'dart:js_interop';

test(Function f) {
  f.toJS;
//  ^^^^
// [analyzer] unspecified
// [web] unspecified
}

class C {}

C? foo() {return null;}

void bar(C c) {}

void baz(Map<String, int> s) {}

dynamic qux() {}

void quux(Symbol s) {}

main() {
  test(test);
  foo.toJS;
//    ^^^^
// [analyzer] unspecified
// [web] unspecified
  bar.toJS;
//    ^^^^
// [analyzer] unspecified
// [web] unspecified
  baz.toJS;
//    ^^^^
// [analyzer] unspecified
// [web] unspecified
  qux.toJS;
//    ^^^^
// [analyzer] unspecified
// [web] unspecified
  quux.toJS;
//     ^^^^
// [analyzer] unspecified
// [web] unspecified
}