[web_ui] move several uses of (deprecated) pkg:js to js_interop_unsafe (#164264)

engine/src/flutter/lib/web_ui/lib/src/engine/js_interop/js_loader.dart

@@ -6,8 +6,8 @@
 library js_loader;
 
 import 'dart:js_interop';
+import 'dart:js_interop_unsafe';
 
-import 'package:js/js_util.dart' as js_util;
 import 'package:ui/src/engine.dart';
 
 @JS()
@@ -29,7 +29,7 @@ class FlutterLoader {}
 
 extension FlutterLoaderExtension on FlutterLoader {
   external void didCreateEngineInitializer(FlutterEngineInitializer initializer);
-  bool get isAutoStart => !js_util.hasProperty(this, 'didCreateEngineInitializer');
+  bool get isAutoStart => !(this as JSObject).has('didCreateEngineInitializer');
 }
 
 /// Typedef for the function that initializes the flutter engine.

engine/src/flutter/lib/web_ui/test/canvaskit/initialization/does_not_mock_module_exports_test.dart

@@ -1,7 +1,10 @@
 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-import 'package:js/js_util.dart' as js_util;
+
+import 'dart:js_interop';
+import 'dart:js_interop_unsafe';
+
 import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
 import 'package:ui/src/engine.dart';
@@ -20,12 +23,12 @@ void testMain() {
 
       // window.exports and window.module should be undefined!
       expect(
-        js_util.hasProperty(domWindow, 'exports'),
+        (domWindow as JSObject).has('exports'),
         isFalse,
         reason: '`window.exports` should not be defined.',
       );
       expect(
-        js_util.hasProperty(domWindow, 'module'),
+        (domWindow as JSObject).has('module'),
         isFalse,
         reason: '`window.module` should not be defined.',
       );

engine/src/flutter/lib/web_ui/test/canvaskit/initialization/stores_config_test.dart

@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:js/js_util.dart' as js_util;
+import 'dart:js_interop';
+import 'dart:js_interop_unsafe';
+
 import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
 import 'package:ui/src/engine.dart';
@@ -15,15 +17,16 @@ void testMain() {
   group('initializeEngineServices', () {
     test('stores user configuration', () async {
       final JsFlutterConfiguration config = JsFlutterConfiguration();
-      // `canvasKitBaseUrl` is required for the test to actually run.
-      js_util.setProperty(config, 'canvasKitBaseUrl', '/canvaskit/');
-      // A property under test, that we'll try to read later.
-      js_util.setProperty(config, 'nonce', 'some_nonce');
-      // A non-existing property to verify our js-interop doesn't crash.
-      js_util.setProperty(config, 'nonexistentProperty', 32.0);
+      (config as JSObject)
+        // `canvasKitBaseUrl` is required for the test to actually run.
+        ..['canvasKitBaseUrl'] = '/canvaskit/'.toJS
+        // A property under test, that we'll try to read later.
+        ..['nonce'] = 'some_nonce'.toJS
+        // A non-existing property to verify our js-interop doesn't crash.
+        ..['nonexistentProperty'] = 32.0.toJS;
 
       // Remove window.flutterConfiguration (if it's there)
-      js_util.setProperty(domWindow, 'flutterConfiguration', null);
+      (domWindow as JSObject)['flutterConfiguration'] = null;
 
       // TODO(web): Replace the above nullification by the following assertion
       // when wasm and JS tests initialize their config the same way:

engine/src/flutter/lib/web_ui/test/engine/initialization_test.dart

@@ -3,8 +3,8 @@
 // found in the LICENSE file.
 
 import 'dart:js_interop';
+import 'dart:js_interop_unsafe';
 
-import 'package:js/js_util.dart' as js_util;
 import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
 import 'package:ui/src/engine.dart' as engine;
@@ -20,14 +20,15 @@ external set didCreateEngineInitializer(JSFunction? callback);
 
 void main() {
   // Prepare _flutter.loader.didCreateEngineInitializer, so it's ready in the page ASAP.
-  loader = js_util.jsify(<String, Object>{
-    'loader': <String, Object>{
-      'didCreateEngineInitializer':
-          () {
-            print('not mocked');
-          }.toJS,
-    },
-  });
+  loader =
+      <String, Object>{
+        'loader': <String, Object>{
+          'didCreateEngineInitializer':
+              () {
+                print('not mocked');
+              }.toJS,
+        },
+      }.jsify();
   internalBootstrapBrowserTest(() => testMain);
 }
 
@@ -52,12 +53,12 @@ void testMain() {
       // Check that the object we captured is actually a loader
       expect(engineInitializer, isNotNull);
       expect(
-        js_util.hasProperty(engineInitializer!, 'initializeEngine'),
+        (engineInitializer! as JSObject).has('initializeEngine'),
         isTrue,
         reason: 'Missing FlutterEngineInitializer method: initializeEngine.',
       );
       expect(
-        js_util.hasProperty(engineInitializer!, 'autoStart'),
+        (engineInitializer! as JSObject).has('autoStart'),
         isTrue,
         reason: 'Missing FlutterEngineInitializer method: autoStart.',
       );