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#3180. Add @JS() annotation tests. Part 4. (#3270)
Add `@JS()` annotation tests. Part 4.
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‎LibTest/js_interop/JS/js_A03_t05.dart

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@@ -32,9 +32,9 @@ void complete(String value) {
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main() {
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globalContext["complete"] = complete.toJS;
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eval(r'''
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var lib1;
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(async () => {
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lib1 = await import('/root_dart/tests/co19/src/LibTest/js_interop/module.js');
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globalThis.lib1 =
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await import('/root_dart/tests/co19/src/LibTest/js_interop/module.js');
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})().then(function(v) {
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globalThis.complete("");
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});

‎LibTest/js_interop/JS/js_A03_t06.dart

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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/// @assertion An annotation on a JavaScript interop declaration.
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///
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/// This annotation defines a given library, top-level external declaration, or
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/// extension type as a JavaScript interop declaration.
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///
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/// @description Check that a library directive can be annotated with a `@JS()`
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/// annotation. Test renaming a top-level function.
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/// @author [email protected]
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@JS("lib1")
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library;
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import 'dart:async';
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import 'dart:js_interop';
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import 'dart:js_interop_unsafe';
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import '../../../Utils/expect.dart';
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import '../js_utils.dart';
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@JS("answer")
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external int myAnswer();
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final completer = Completer<String>();
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void complete(String value) {
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completer.complete(value);
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}
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main() {
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globalContext["complete"] = complete.toJS;
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eval(r'''
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(async () => {
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globalThis.lib1 =
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await import('/root_dart/tests/co19/src/LibTest/js_interop/module.js');
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})().then(function(v) {
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globalThis.complete("");
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});
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''');
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asyncStart();
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completer.future.then((_) {
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Expect.equals(42, myAnswer()); // calls lib1.answer()
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asyncEnd();
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});
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}

‎LibTest/js_interop/JS/js_A03_t07.dart

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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/// @assertion An annotation on a JavaScript interop declaration.
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///
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/// This annotation defines a given library, top-level external declaration, or
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/// extension type as a JavaScript interop declaration.
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///
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/// @description Check that a library directive can be annotated with a `@JS()`
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/// annotation. Test an extension type.
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/// @author [email protected]
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@JS("lib1")
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library;
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import 'dart:async';
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import 'dart:js_interop';
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import 'dart:js_interop_unsafe';
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import '../../../Utils/expect.dart';
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import '../js_utils.dart';
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extension type C(JSObject v) implements JSObject {
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external String foo();
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external static String bar();
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}
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final completer = Completer<String>();
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void complete(String value) {
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completer.complete(value);
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}
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main() {
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globalContext["complete"] = complete.toJS;
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eval(r'''
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(async () => {
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globalThis.lib1 =
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await import('/root_dart/tests/co19/src/LibTest/js_interop/module.js');
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})().then(function(v) {
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globalThis.c = new globalThis.C();
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globalThis.complete("");
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});
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''');
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asyncStart();
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completer.future.then((_) {
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C c = C(globalContext["c"] as JSObject);
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Expect.equals("C.foo() from module.js", c.foo());
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Expect.equals("C.bar() from module.js", C.bar());
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asyncEnd();
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});
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}

‎LibTest/js_interop/JS/js_A03_t08.dart

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
3+
// BSD-style license that can be found in the LICENSE file.
4+
5+
/// @assertion An annotation on a JavaScript interop declaration.
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///
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/// This annotation defines a given library, top-level external declaration, or
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/// extension type as a JavaScript interop declaration.
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///
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/// @description Check that a library directive can be annotated with a `@JS()`
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/// annotation. Test an extension type with rename.
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/// @author [email protected]
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@JS("lib1")
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library;
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import 'dart:async';
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import 'dart:js_interop';
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import 'dart:js_interop_unsafe';
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import '../../../Utils/expect.dart';
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import '../js_utils.dart';
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@JS("C")
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extension type A(JSObject v) implements JSObject {
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@JS("foo")
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external String myFoo();
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@JS("bar")
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external static String myBar();
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}
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final completer = Completer<String>();
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void complete(String value) {
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completer.complete(value);
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}
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main() {
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globalContext["complete"] = complete.toJS;
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eval(r'''
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(async () => {
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globalThis.lib1 =
42+
await import('/root_dart/tests/co19/src/LibTest/js_interop/module.js');
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})().then(function(v) {
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globalThis.c = new globalThis.C();
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globalThis.complete("");
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});
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''');
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asyncStart();
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completer.future.then((_) {
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A c = A(globalContext["c"] as JSObject);
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Expect.equals("C.foo() from module.js", c.myFoo());
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Expect.equals("C.bar() from module.js", A.myBar());
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asyncEnd();
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});
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}

‎LibTest/js_interop/JS/js_A04_t01.dart

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
4+
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/// @assertion An annotation on a JavaScript interop declaration.
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/// ...
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/// Specifying name customizes the JavaScript name to use, which can be used in
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/// the following scenarios:
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/// - Adding a JavaScript prefix to all the external top-level declarations,
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/// static members, and constructors of a library by parameterizing the
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/// annotation on the library with `name`.
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/// - Specifying the JavaScript class to use for external static members and
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/// constructors of an interop extension type by parameterizing the annotation
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/// on the interop extension type with `name`.
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/// - Renaming external declarations by parameterizing the annotation on the
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/// member with `name`.
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///
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/// @description Check that `@JS("")` is equivalent to `@JS()`.
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/// @author [email protected]
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@JS("")
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library;
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import 'dart:js_interop';
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import 'dart:js_interop_unsafe';
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import '../../../Utils/expect.dart';
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import '../js_utils.dart';
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@JS("")
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external int f1();
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@JS("")
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extension type ET1(JSObject _) implements JSObject {
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external String f2();
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external static String f3();
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}
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extension type ET2(JSObject _) implements JSObject {
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@JS("")
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external String f4();
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@JS("")
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external static String f5();
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}
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main() {
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eval(r'''
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globalThis.f1 = function() {return 1;};
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class ET1 {
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f2() {
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return "f2() from ET1";
53+
}
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static f3() {
55+
return "f3() from ET1";
56+
}
57+
}
58+
globalThis.ET1 = ET1;
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globalThis.et1 = new ET1();
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class ET2 {
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f4() {
63+
return "f4() from ET2";
64+
}
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static f5() {
66+
return "f5() from ET2";
67+
}
68+
}
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globalThis.ET2 = ET2;
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globalThis.et2 = new ET2();
71+
''');
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Expect.equals(1, f1());
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ET1 et1 = ET1(globalContext["et1"] as JSObject);
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Expect.equals("f2() from ET1", et1.f2());
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Expect.equals("f3() from ET1", ET1.f3());
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ET2 et2 = ET2(globalContext["et2"] as JSObject);
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Expect.equals("f4() from ET2", et2.f4());
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Expect.equals("f5() from ET2", ET2.f5());
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}

‎LibTest/js_interop/JS/js_A04_t02.dart

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
3+
// BSD-style license that can be found in the LICENSE file.
4+
5+
/// @assertion An annotation on a JavaScript interop declaration.
6+
/// ...
7+
/// Specifying name customizes the JavaScript name to use, which can be used in
8+
/// the following scenarios:
9+
/// - Adding a JavaScript prefix to all the external top-level declarations,
10+
/// static members, and constructors of a library by parameterizing the
11+
/// annotation on the library with `name`.
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/// - Specifying the JavaScript class to use for external static members and
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/// constructors of an interop extension type by parameterizing the annotation
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/// on the interop extension type with `name`.
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/// - Renaming external declarations by parameterizing the annotation on the
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/// member with `name`.
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///
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/// @description Check that `@JS(null)` is equivalent to `@JS()`.
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/// @author [email protected]
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@JS(null)
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library;
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import 'dart:js_interop';
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import 'dart:js_interop_unsafe';
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import '../../../Utils/expect.dart';
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import '../js_utils.dart';
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@JS(null)
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external int f1();
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@JS(null)
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extension type ET1(JSObject _) implements JSObject {
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external String f2();
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external static String f3();
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}
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extension type ET2(JSObject _) implements JSObject {
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@JS(null)
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external String f4();
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@JS(null)
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external static String f5();
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}
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main() {
47+
eval(r'''
48+
globalThis.f1 = function() {return 1;};
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50+
class ET1 {
51+
f2() {
52+
return "f2() from ET1";
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}
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static f3() {
55+
return "f3() from ET1";
56+
}
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}
58+
globalThis.ET1 = ET1;
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globalThis.et1 = new ET1();
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class ET2 {
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f4() {
63+
return "f4() from ET2";
64+
}
65+
static f5() {
66+
return "f5() from ET2";
67+
}
68+
}
69+
globalThis.ET2 = ET2;
70+
globalThis.et2 = new ET2();
71+
''');
72+
Expect.equals(1, f1());
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ET1 et1 = ET1(globalContext["et1"] as JSObject);
75+
Expect.equals("f2() from ET1", et1.f2());
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Expect.equals("f3() from ET1", ET1.f3());
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ET2 et2 = ET2(globalContext["et2"] as JSObject);
79+
Expect.equals("f4() from ET2", et2.f4());
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Expect.equals("f5() from ET2", ET2.f5());
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}

‎LibTest/js_interop/module.js

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export function answer() {
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return 42;
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}
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export class C {
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foo() {
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return "C.foo() from module.js";
15+
}
16+
static bar() {
17+
return "C.bar() from module.js";
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}
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}
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globalThis.C = C;

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