LibTest/js_interop/JSFunctionUtilExtension/callAsFunction_A01_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
/// @JS('call')
/// JSAny? callAsFunction([
///   JSAny? thisArg,
///   JSAny? arg1,
///   JSAny? arg2,
///   JSAny? arg3,
///   JSAny? arg4,
/// ])
/// Call this [JSFunction] using the JavaScript `.call` syntax and returns the
/// result.
///
/// Takes at most 4 args for consistency with other APIs and relative brevity.
/// If more are needed, you can declare your own external member with the same
/// syntax.
///
/// @description Check that this method calls this JS function and returns the
/// result.
/// @author sgrekhov22@gmail.com

import 'dart:js_interop';
import 'dart:js_interop_unsafe';
import '../../../Utils/expect.dart';
import '../../js_interop/js_utils.dart';

extension type ET._(JSObject _) implements JSObject {
  external factory ET({JSString bar});
}

main() {
  eval(r'''
    globalThis.f1 = function(p1, p2, p3, p4) {
      return `${this.bar}, ${p1}, ${p2}, ${p3}, ${p4}`;
    };
  ''');
  JSFunction f1 = globalContext["f1"] as JSFunction;
  var res = f1.callAsFunction(
    ET(bar: "BAR".toJS),
    1.toJS,
    "two".toJS,
    3.14.toJS,
    true.toJS,
  );
  Expect.equals("BAR, 1, two, 3.14, true", (res as JSString).toDart);
}