[web] Migrate framework away from dart:html and package:js (#128580)

Use `package:web` and `dart:js_interop` instead.

Part of https://github.com/flutter/flutter/issues/127030

dev/bots/allowlist.dart

@@ -48,5 +48,6 @@ const Set<String> kCorePackageAllowList = <String>{
   'test_api',
   'vector_math',
   'vm_service',
+  'web',
   'webdriver',
 };

packages/flutter/lib/src/foundation/_capabilities_web.dart

@@ -2,11 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// For now, we're hiding dart:js_interop's `@JS` to avoid a conflict with
-// package:js' `@JS`. In the future, we should be able to remove package:js
-// altogether and just import dart:js_interop.
-import 'dart:js_interop' hide JS;
-import 'package:js/js.dart';
+import 'dart:js_interop';
 
 // This value is set by the engine. It is used to determine if the application is
 // using canvaskit.

packages/flutter/lib/src/services/dom.dart

@@ -2,11 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// For now, we're hiding dart:js_interop's `@JS` to avoid a conflict with
-// package:js' `@JS`. In the future, we should be able to remove package:js
-// altogether and just import dart:js_interop.
-import 'dart:js_interop' hide JS;
-import 'package:js/js.dart';
+import 'dart:js_interop';
 
 /// This file includes static interop helpers for Flutter Web.
 // TODO(joshualitt): This file will eventually be removed,

packages/flutter/pubspec.yaml

@@ -9,10 +9,10 @@ dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
   characters: 1.3.0
   collection: 1.17.2
-  js: 0.6.7
   material_color_utilities: 0.5.0
   meta: 1.9.1
   vector_math: 2.1.4
+  web: 0.1.3-beta
   sky_engine:
     sdk: flutter
 
@@ -72,4 +72,4 @@ dev_dependencies:
   webkit_inspection_protocol: 1.2.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   yaml: 3.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
 
-# PUBSPEC CHECKSUM: dd07
+# PUBSPEC CHECKSUM: d32a

packages/flutter/test/painting/_test_http_request.dart

@@ -2,14 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// For now, we're hiding dart:js_interop's `@JS` to avoid a conflict with
-// package:js' `@JS`. In the future, we should be able to remove package:js
-// altogether and just import dart:js_interop.
-import 'dart:js_interop' hide JS;
+import 'dart:js_interop';
 
 import 'package:flutter/src/services/dom.dart';
-import 'package:js/js.dart';
-import 'package:js/js_util.dart' as js_util;
 
 /// Defines a new property on an Object.
 @JS('Object.defineProperty')
@@ -19,11 +14,10 @@ void createGetter(JSAny mock, String key, JSAny? Function() get) {
   objectDefineProperty(
     mock,
     key.toJS,
-      js_util.jsify(
-          <String, Object>{
-            'get': () { return get(); }.toJS
-          }
-      ) as JSAny);
+    <String, JSFunction>{
+      'get': (() => get()).toJS,
+    }.jsify()!,
+  );
 }
 
 @JS()
@@ -51,13 +45,12 @@ class TestHttpRequest {
     );
     // TODO(srujzs): This is needed for when we reify JS types. Right now, JSAny
     // is a typedef for Object?, but when we reify, it'll be its own type.
-    // ignore: unnecessary_cast
     final JSAny mock = _mock as JSAny;
-    createGetter(mock, 'headers', () => js_util.jsify(headers) as JSAny);
+    createGetter(mock, 'headers', () => headers.jsify());
     createGetter(mock,
-        'responseHeaders', () => js_util.jsify(responseHeaders) as JSAny);
+        'responseHeaders', () => responseHeaders.jsify());
     createGetter(mock, 'status', () => status.toJS);
-    createGetter(mock, 'response', () => js_util.jsify(response) as JSAny);
+    createGetter(mock, 'response', () => response.jsify());
   }
 
   late DomXMLHttpRequestMock _mock;

packages/flutter/test/widgets/selectable_region_context_menu_test.dart

@@ -5,20 +5,36 @@
 @TestOn('browser') // This file contains web-only library.
 library;
 
-import 'dart:html' as html;
+import 'dart:js_interop';
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:web/web.dart' as web;
+
+extension on JSString {
+  external JSBoolean includes(JSString searchString);
+}
+extension on web.HTMLCollection {
+  Iterable<web.Element> get iterable => _genIterable(length, (JSNumber i) => item(i));
+}
+extension on web.CSSRuleList {
+  Iterable<web.CSSRule> get iterable => _genIterable(length, (JSNumber i) => item(i));
+}
+
+typedef ItemGetter<T> = T? Function(JSNumber index);
+Iterable<T> _genIterable<T>(JSNumber length, ItemGetter<T> getItem) {
+  return Iterable<T>.generate(length.toDart.toInt(), (int index) => getItem(index.toJS)!);
+}
 
 void main() {
-  html.Element? element;
+  web.HTMLElement? element;
   PlatformSelectableRegionContextMenu.debugOverrideRegisterViewFactory = (String viewType, Object Function(int viewId) fn, {bool isVisible = true}) {
-    element = fn(0) as html.Element;
+    element = fn(0) as web.HTMLElement;
     // The element needs to be attached to the document body to receive mouse
     // events.
-    html.document.body!.append(element!);
+    web.document.body!.append(element);
   };
   // This force register the dom element.
   PlatformSelectableRegionContextMenu(child: const Placeholder());
@@ -26,19 +42,24 @@ void main() {
 
   test('DOM element is set up correctly', () async {
     expect(element, isNotNull);
-    expect(element!.style.width, '100%');
-    expect(element!.style.height, '100%');
-    expect(element!.classes.length, 1);
-    final String className = element!.classes.first;
+    expect(element!.style.width, '100%'.toJS);
+    expect(element!.style.height, '100%'.toJS);
+    expect(element!.classList.length, 1.toJS);
+    final JSString className = element!.className;
 
-    expect(html.document.head!.children, isNotEmpty);
+    expect(web.document.head!.children.iterable, isNotEmpty);
     bool foundStyle = false;
-    for (final html.Element element in html.document.head!.children) {
-      if (element is! html.StyleElement) {
+    for (final web.Element element in web.document.head!.children.iterable) {
+      if (element.tagName != 'STYLE'.toJS) {
         continue;
       }
-      final html.CssStyleSheet sheet = element.sheet! as html.CssStyleSheet;
-      foundStyle = sheet.rules!.any((html.CssRule rule) => rule.cssText!.contains(className));
+      final web.CSSRuleList? rules = (element as web.HTMLStyleElement).sheet?.rules;
+      if (rules != null) {
+        foundStyle = rules.iterable.any((web.CSSRule rule) => rule.cssText.includes(className).toDart);
+      }
+      if (foundStyle) {
+        break;
+      }
     }
     expect(foundStyle, isTrue);
   });
@@ -62,11 +83,13 @@ void main() {
 
     // Dispatch right click.
     element!.dispatchEvent(
-      html.MouseEvent(
-        'mousedown',
-        button: 2,
-        clientX: 200,
-        clientY: 300,
+      web.MouseEvent(
+        'mousedown'.toJS,
+        web.MouseEventInit(
+          button: 2.toJS,
+          clientX: 200.toJS,
+          clientY: 300.toJS,
+        ),
       ),
     );
     final RenderSelectionSpy renderSelectionSpy = tester.renderObject<RenderSelectionSpy>(find.byKey(spy));