[file_selector_web] migrate to pkg:web (#5413)

This allows this package to be used in a web app compiled to Wasm.

Helps unblock https://github.com/flutter/devtools/issues/6606

packages/file_selector/file_selector_web/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.9.3
+
+* Updates minimum supported SDK version to Dart 3.2.
+
 ## 0.9.2+1
 
 * Adds pub topics to package metadata.

packages/file_selector/file_selector_web/example/integration_test/dom_helper_test.dart

@@ -2,23 +2,29 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:html';
+import 'dart:js_interop';
 
 import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
 import 'package:file_selector_web/src/dom_helper.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:integration_test/integration_test.dart';
+import 'package:web/helpers.dart';
 
 void main() {
   group('dom_helper', () {
     IntegrationTestWidgetsFlutterBinding.ensureInitialized();
     late DomHelper domHelper;
-    late FileUploadInputElement input;
+    late HTMLInputElement input;
 
     FileList? createFileList(List<File> files) {
       final DataTransfer dataTransfer = DataTransfer();
-      files.forEach(dataTransfer.items!.add);
-      return dataTransfer.files as FileList?;
+      for (final File e in files) {
+        // TODO(srujzs): This is necessary in order to support package:web 0.4.0.
+        // This was not needed with 0.3.0, hence the lint.
+        // ignore: unnecessary_cast
+        dataTransfer.items.add(e as JSAny);
+      }
+      return dataTransfer.files;
     }
 
     void setFilesAndTriggerEvent(List<File> files, Event event) {
@@ -36,12 +42,13 @@ void main() {
 
     setUp(() {
       domHelper = DomHelper();
-      input = FileUploadInputElement();
+      input = (createElementTag('input') as HTMLInputElement)..type = 'file';
     });
 
     group('getFiles', () {
-      final File mockFile1 = File(<Object>['123456'], 'file1.txt');
-      final File mockFile2 = File(<Object>[], 'file2.txt');
+      final File mockFile1 =
+          File(<Object>['123456'].jsify as JSArray, 'file1.txt');
+      final File mockFile2 = File(<Object>[].jsify as JSArray, 'file2.txt');
 
       testWidgets('works', (_) async {
         final Future<List<XFile>> futureFiles = domHelper.getFiles(
@@ -114,7 +121,7 @@ void main() {
           input: input,
         );
 
-        expect(input.matchesWithAncestors('body'), true);
+        expect(input.matches('body'), true);
         expect(input.accept, accept);
         expect(input.multiple, multiple);
         expect(
@@ -128,7 +135,7 @@ void main() {
         await futureFile;
 
         // It should be already removed from the DOM after the file is resolved.
-        expect(input.parent, isNull);
+        expect(input.parentElement, isNull);
       });
     });
   });

packages/file_selector/file_selector_web/example/integration_test/file_selector_web_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:html';
 import 'dart:typed_data';
 
 import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
@@ -10,6 +9,7 @@ import 'package:file_selector_web/file_selector_web.dart';
 import 'package:file_selector_web/src/dom_helper.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:integration_test/integration_test.dart';
+import 'package:web/helpers.dart';
 
 void main() {
   group('FileSelectorWeb', () {
@@ -121,7 +121,7 @@ class MockDomHelper implements DomHelper {
   Future<List<XFile>> getFiles({
     String accept = '',
     bool multiple = false,
-    FileUploadInputElement? input,
+    HTMLInputElement? input,
   }) {
     expect(accept, _expectedAccept,
         reason: 'Expected "accept" value does not match.');

packages/file_selector/file_selector_web/example/pubspec.yaml

@@ -11,6 +11,7 @@ dependencies:
     path: ../
   flutter:
     sdk: flutter
+  web: '>=0.3.0 <0.5.0'
 
 dev_dependencies:
   flutter_test:

packages/file_selector/file_selector_web/lib/src/dom_helper.dart

@@ -3,41 +3,46 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:html';
+import 'dart:js_interop';
 
 import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
 import 'package:flutter/foundation.dart' show visibleForTesting;
 import 'package:flutter/services.dart';
+import 'package:web/helpers.dart';
 
 /// Class to manipulate the DOM with the intention of reading files from it.
 class DomHelper {
   /// Default constructor, initializes the container DOM element.
   DomHelper() {
     final Element body = querySelector('body')!;
-    body.children.add(_container);
+    body.appendChild(_container);
   }
 
-  final Element _container = Element.tag('file-selector');
+  final Element _container = createElementTag('file-selector');
 
   /// Sets the <input /> attributes and waits for a file to be selected.
   Future<List<XFile>> getFiles({
     String accept = '',
     bool multiple = false,
-    @visibleForTesting FileUploadInputElement? input,
+    @visibleForTesting HTMLInputElement? input,
   }) {
     final Completer<List<XFile>> completer = Completer<List<XFile>>();
-    final FileUploadInputElement inputElement =
-        input ?? FileUploadInputElement();
+    final HTMLInputElement inputElement =
+        input ?? (createElementTag('input') as HTMLInputElement)
+          ..type = 'file';
 
-    _container.children.add(
+    _container.appendChild(
       inputElement
         ..accept = accept
         ..multiple = multiple,
     );
 
     inputElement.onChange.first.then((_) {
-      final List<XFile> files =
-          inputElement.files!.map(_convertFileToXFile).toList();
+      final List<XFile> files = Iterable<File>.generate(
+              inputElement.files!.length,
+              (int i) => inputElement.files!.item(i)!)
+          .map(_convertFileToXFile)
+          .toList();
       inputElement.remove();
       completer.complete(files);
     });
@@ -52,10 +57,13 @@ class DomHelper {
       completer.completeError(platformException);
     });
 
-    inputElement.addEventListener('cancel', (Event event) {
-      inputElement.remove();
-      completer.complete(<XFile>[]);
-    });
+    inputElement.addEventListener(
+      'cancel',
+      (Event event) {
+        inputElement.remove();
+        completer.complete(<XFile>[]);
+      }.toJS,
+    );
 
     // TODO(dit): Reimplement this with the showPicker() API, https://github.com/flutter/flutter/issues/130365
     inputElement.click();
@@ -64,10 +72,12 @@ class DomHelper {
   }
 
   XFile _convertFileToXFile(File file) => XFile(
-        Url.createObjectUrl(file),
+        // TODO(srujzs): This is necessary in order to support package:web 0.4.0.
+        // This was not needed with 0.3.0, hence the lint.
+        // ignore: unnecessary_cast
+        URL.createObjectURL(file as JSObject),
         name: file.name,
         length: file.size,
-        lastModified: DateTime.fromMillisecondsSinceEpoch(
-            file.lastModified ?? DateTime.now().millisecondsSinceEpoch),
+        lastModified: DateTime.fromMillisecondsSinceEpoch(file.lastModified),
       );
 }

packages/file_selector/file_selector_web/pubspec.yaml

@@ -2,11 +2,11 @@ name: file_selector_web
 description: Web platform implementation of file_selector
 repository: https://github.com/flutter/packages/tree/main/packages/file_selector/file_selector_web
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+file_selector%22
-version: 0.9.2+1
+version: 0.9.3
 
 environment:
-  sdk: ">=2.19.0 <4.0.0"
-  flutter: ">=3.7.0"
+  sdk: ^3.2.0
+  flutter: ">=3.16.0"
 
 flutter:
   plugin:
@@ -22,6 +22,7 @@ dependencies:
     sdk: flutter
   flutter_web_plugins:
     sdk: flutter
+  web: '>=0.3.0 <0.5.0'
 
 dev_dependencies:
   flutter_test:

script/configs/allowed_unpinned_deps.yaml

@@ -51,6 +51,7 @@
 - test_api
 - vm_service
 - wasm
+- web
 - yaml
 # Google-owned packages
 - _discoveryapis_commons

script/tool/lib/src/common/core.dart

@@ -68,6 +68,7 @@ final Map<Version, Version> _dartSdkForFlutterSdk = <Version, Version>{
   Version(3, 10, 0): Version(3, 0, 0),
   Version(3, 10, 6): Version(3, 0, 6),
   Version(3, 13, 0): Version(3, 1, 0),
+  Version(3, 16, 0): Version(3, 2, 0),
 };
 
 /// Returns the version of the Dart SDK that shipped with the given Flutter