Enable avoid_redundant_argument_values lint (#91409)

analysis_options.yaml

@@ -74,7 +74,7 @@ linter:
     # - avoid_positional_boolean_parameters # would have been nice to enable this but by now there's too many places that break it
     - avoid_print
     # - avoid_private_typedef_functions # we prefer having typedef (discussion in https://github.com/flutter/flutter/pull/16356)
-    # - avoid_redundant_argument_values # not yet tested
+    - avoid_redundant_argument_values
     - avoid_relative_lib_imports
     - avoid_renaming_method_parameters
     - avoid_return_types_on_setters

dev/benchmarks/complex_layout/lib/main.dart

@@ -370,7 +370,6 @@ class UserHeader extends StatelessWidget {
           ),
           Expanded(
             child: Column(
-              mainAxisAlignment: MainAxisAlignment.start,
               crossAxisAlignment: CrossAxisAlignment.stretch,
               children: <Widget>[
                 RichText(text: TextSpan(
@@ -569,7 +568,6 @@ class BottomBar extends StatelessWidget {
         border: Border(
           top: BorderSide(
             color: Theme.of(context).dividerColor,
-            width: 1.0,
           ),
         ),
       ),

dev/benchmarks/complex_layout/test_memory/scroll_perf.dart

@@ -28,7 +28,6 @@ Future<void> main() async {
     },
     behavior: HitTestBehavior.opaque,
     child: const IgnorePointer(
-      ignoring: true,
       child: ComplexLayoutApp(),
     ),
   ));

dev/benchmarks/macrobenchmarks/lib/src/color_filter_and_fade.dart

@@ -147,7 +147,6 @@ class _ShadowWidget extends StatelessWidget {
         ),
         size: Size(width, height),
         isComplex: true,
-        willChange: false,
       ),
     );
   }

dev/benchmarks/macrobenchmarks/lib/src/filtered_child_animation.dart

@@ -73,7 +73,6 @@ class _FilteredChildAnimationPageState extends State<FilteredChildAnimationPage>
       color: Colors.green,
       boxShadow: complex ? <BoxShadow>[
         const BoxShadow(
-          color: Colors.black,
           blurRadius: 10.0,
         ),
       ] : null,

dev/benchmarks/macrobenchmarks/lib/src/multi_widget_construction.dart

@@ -32,7 +32,6 @@ class _MultiWidgetConstructTableState extends State<MultiWidgetConstructTable>
     _controller = AnimationController(
       vsync: this,
       duration: const Duration(milliseconds: 10000),
-      lowerBound: 0,
       upperBound: colorList.length + 1.0,
     )..repeat();
   }

dev/benchmarks/macrobenchmarks/lib/src/web/bench_pageview_scroll_linethrough.dart

@@ -113,7 +113,7 @@ class _CustomPainter extends CustomPainter {
 
       _textPainter.text = span;
 
-      _textPainter.layout(minWidth: 0, maxWidth: width);
+      _textPainter.layout(maxWidth: width);
       _linePainter.style = PaintingStyle.fill;
       canvas.drawRect(
           Rect.fromLTWH(xPosition, yPosition - viewPadding, width, height),

dev/benchmarks/macrobenchmarks/lib/src/web/bench_paths_recording.dart

@@ -1833,7 +1833,7 @@ void pathOps78() {
 
 void pathOps79() {
   final Path path79 = Path();
-  path79.addRRect(RRect.fromRectAndCorners(const Rect.fromLTRB(0, 0, 64, 56), topLeft: Radius.zero, topRight: Radius.zero, bottomLeft: const Radius.circular(10), bottomRight: Radius.zero, ));
+  path79.addRRect(RRect.fromRectAndCorners(const Rect.fromLTRB(0, 0, 64, 56), bottomLeft: const Radius.circular(10), ));
   gFillType = path79.fillType;
   path80 = path79.shift(const Offset(906, 136));
   gFillType = path79.fillType;
@@ -5828,7 +5828,7 @@ void pathOps576() {
   path576.moveTo(0, 0);
   path576.lineTo(220.60000000000002, 0);
   path576.quadraticBezierTo(235.60000000000002, 0, 237.569696969697, 7.817946907441011);
-  path576.arcToPoint(const Offset(299.630303030303, 7.817946907441011), radius: const Radius.circular(32), rotation: 0, largeArc: false, clockwise: false);
+  path576.arcToPoint(const Offset(299.630303030303, 7.817946907441011), radius: const Radius.circular(32), clockwise: false);
   path576.quadraticBezierTo(301.6, 0, 316.6, 0);
   path576.lineTo(312.6, 0);
   path576.lineTo(312.6, 48);

dev/benchmarks/macrobenchmarks/lib/src/web/bench_simple_lazy_text_scroll.dart

@@ -25,7 +25,6 @@ class BenchSimpleLazyTextScroll extends WidgetRecorder {
       child: Row(
         children: const <Widget>[
           Flexible(
-            flex: 1,
             child: _TestScrollingWidget(
               initialScrollOffset: 0,
               scrollDistance: 300,
@@ -33,7 +32,6 @@ class BenchSimpleLazyTextScroll extends WidgetRecorder {
             ),
           ),
           Flexible(
-            flex: 1,
             child: _TestScrollingWidget(
               initialScrollOffset: 1000,
               scrollDistance: 500,
@@ -41,7 +39,6 @@ class BenchSimpleLazyTextScroll extends WidgetRecorder {
             ),
           ),
           Flexible(
-            flex: 1,
             child: _TestScrollingWidget(
               initialScrollOffset: 2000,
               scrollDistance: 700,

dev/benchmarks/macrobenchmarks/lib/src/web/bench_text_layout.dart

@@ -417,7 +417,6 @@ class ColorItem extends StatelessWidget {
           bottom: false,
           child: Row(
             mainAxisAlignment: MainAxisAlignment.spaceBetween,
-            crossAxisAlignment: CrossAxisAlignment.center,
             children: <Widget>[
               Text('$_counter:$prefix$index'),
               Text(colorString()),

dev/benchmarks/macrobenchmarks/lib/src/web/bench_wrapbox_scroll.dart

@@ -155,7 +155,6 @@ class ProductOption extends StatelessWidget {
       padding: const EdgeInsets.symmetric(horizontal: 11, vertical: 5),
       decoration: BoxDecoration(
         border: Border.all(
-          width: 1,
           color: const Color(0xffebebeb),
         ),
         borderRadius: const BorderRadius.all(Radius.circular(15)),

dev/benchmarks/macrobenchmarks/lib/web_benchmarks.dart

@@ -31,7 +31,7 @@ import 'src/web/recorder.dart';
 
 typedef RecorderFactory = Recorder Function();
 
-const bool isCanvasKit = bool.fromEnvironment('FLUTTER_WEB_USE_SKIA', defaultValue: false);
+const bool isCanvasKit = bool.fromEnvironment('FLUTTER_WEB_USE_SKIA');
 
 /// List of all benchmarks that run in the devicelab.
 ///

dev/benchmarks/macrobenchmarks/test/frame_policy.dart

@@ -31,11 +31,9 @@ void main() {
       final List<PointerEventRecord> records = <PointerEventRecord>[
         PointerEventRecord(Duration.zero, <PointerEvent>[
           PointerAddedEvent(
-            timeStamp: Duration.zero,
             position: location,
           ),
           PointerDownEvent(
-            timeStamp: Duration.zero,
             position: location,
             pointer: 1,
           ),

dev/benchmarks/microbenchmarks/lib/foundation/change_notifier_bench.dart

@@ -167,16 +167,16 @@ void main() {
   }
 
   runAddListenerBenchmark(_kNumWarmUp, addResult: false);
-  runAddListenerBenchmark(_kNumIterations, addResult: true);
+  runAddListenerBenchmark(_kNumIterations);
 
   runNotifyListenerBenchmark(_kNumWarmUp, addResult: false);
-  runNotifyListenerBenchmark(_kNumIterations, addResult: true);
+  runNotifyListenerBenchmark(_kNumIterations);
 
   runRemoveListenerBenchmark(_kNumWarmUp, addResult: false);
-  runRemoveListenerBenchmark(_kNumIterations, addResult: true);
+  runRemoveListenerBenchmark(_kNumIterations);
 
   runRemoveListenerWhileNotifyingBenchmark(_kNumWarmUp, addResult: false);
-  runRemoveListenerWhileNotifyingBenchmark(_kNumIterations, addResult: true);
+  runRemoveListenerWhileNotifyingBenchmark(_kNumIterations);
 
   printer.printToStdout();
 }

dev/benchmarks/microbenchmarks/lib/geometry/curves_bench.dart

@@ -48,7 +48,7 @@ void main() {
     Offset(0.70, 0.04),
     Offset(0.78, 0.98),
     Offset(0.88, -0.00),
-  ], tension: 0.00);
+  ]);
   _testCurve(
     catmullRomCurve,
     name: 'catmullrom_transform_iteration',

dev/benchmarks/microbenchmarks/lib/language/sync_star_semantics_bench.dart

@@ -19,7 +19,7 @@ void main() {
   for (int i = 0; i < words.length; i++) {
     if (i.isEven) {
       data.add(
-        InlineSpanSemanticsInformation(words[i], isPlaceholder: false),
+        InlineSpanSemanticsInformation(words[i]),
       );
     } else if (i.isEven) {
       data.add(

dev/benchmarks/platform_views_layout_hybrid_composition/lib/android_platform_view.dart

@@ -38,7 +38,6 @@ class AndroidPlatformView extends StatelessWidget {
           id: params.id,
           viewType: viewType,
           layoutDirection: TextDirection.ltr,
-          creationParams: null,
           creationParamsCodec: const StandardMessageCodec(),
         )
           ..addOnPlatformViewCreatedListener(params.onPlatformViewCreated)

dev/bots/analyze_sample_code.dart

@@ -30,14 +30,12 @@ Future<void> main(List<String> arguments) async {
   final ArgParser argParser = ArgParser();
   argParser.addOption(
     'temp',
-    defaultsTo: null,
     help: 'A location where temporary files may be written. Defaults to a '
           'directory in the system temp folder. If specified, will not be '
           'automatically removed at the end of execution.',
   );
   argParser.addFlag(
     'verbose',
-    defaultsTo: false,
     negatable: false,
     help: 'Print verbose output for the analysis process.',
   );
@@ -52,12 +50,10 @@ Future<void> main(List<String> arguments) async {
   argParser.addFlag(
     'include-dart-ui',
     defaultsTo: true,
-    negatable: true,
     help: 'Includes the dart:ui code supplied by the engine in the analysis.',
   );
   argParser.addFlag(
     'help',
-    defaultsTo: false,
     negatable: false,
     help: 'Print help for this command.',
   );
@@ -69,7 +65,6 @@ Future<void> main(List<String> arguments) async {
   argParser.addFlag(
     'global-activate-snippets',
     defaultsTo: true,
-    negatable: true,
     help: 'Whether or not to "pub global activate" the snippets package. If set, will '
           'activate version $_snippetsActivateVersion',
   );
@@ -476,7 +471,6 @@ class SampleChecker {
         if (!Platform.environment.containsKey('FLUTTER_ROOT')) 'FLUTTER_ROOT': _flutterRoot,
         if (_flutterVersion!.isNotEmpty) 'FLUTTER_VERSION': _flutterVersion!,
       },
-      includeParentEnvironment: true,
     );
   }
 
@@ -1155,7 +1149,7 @@ class Sample {
     final StringBuffer buf = StringBuffer('sample ${args.join(' ')}\n');
     int count = start.line;
     for (final String line in input) {
-      buf.writeln(' ${count.toString().padLeft(4, ' ')}: $line');
+      buf.writeln(' ${count.toString().padLeft(4)}: $line');
       count++;
     }
     return buf.toString();

dev/bots/browser.dart

@@ -94,8 +94,6 @@ class AppServer {
       debugPort: browserDebugPort,
       url: appUrl,
       userDataDirectory: userDataDirectory.path,
-      windowHeight: 1024,
-      windowWidth: 1024,
     ), onError: chromeErrorCompleter.complete);
     return AppServer._(server, chrome, chromeErrorCompleter.future);
   }

dev/bots/prepare_package.dart

@@ -687,7 +687,6 @@ class ArchivePublisher {
     try {
       await _runGsUtil(
         <String>['stat', cloudPath],
-        failOk: false,
       );
     } on PreparePackageException {
       // `gsutil stat gs://path/to/file` will exit with 1 if file does not exist
@@ -737,7 +736,6 @@ Future<void> main(List<String> rawArguments) async {
   final ArgParser argParser = ArgParser();
   argParser.addOption(
     'temp_dir',
-    defaultsTo: null,
     help: 'A location where temporary files may be written. Defaults to a '
         'directory in the system temp folder. Will write a few GiB of data, '
         'so it should have sufficient free space. If a temp_dir is not '
@@ -745,18 +743,15 @@ Future<void> main(List<String> rawArguments) async {
         'removed automatically.',
   );
   argParser.addOption('revision',
-      defaultsTo: null,
       help: 'The Flutter git repo revision to build the '
           'archive with. Must be the full 40-character hash. Required.');
   argParser.addOption(
     'branch',
-    defaultsTo: null,
     allowed: Branch.values.map<String>((Branch branch) => getBranchName(branch)),
     help: 'The Flutter branch to build the archive with. Required.',
   );
   argParser.addOption(
     'output',
-    defaultsTo: null,
     help: 'The path to the directory where the output archive should be '
         'written. If --output is not specified, the archive will be written to '
         "the current directory. If the output directory doesn't exist, it, and "
@@ -764,7 +759,6 @@ Future<void> main(List<String> rawArguments) async {
   );
   argParser.addFlag(
     'publish',
-    defaultsTo: false,
     help: 'If set, will publish the archive to Google Cloud Storage upon '
         'successful creation of the archive. Will publish under this '
         'directory: $baseUrl$releaseFolder',
@@ -772,18 +766,15 @@ Future<void> main(List<String> rawArguments) async {
   argParser.addFlag(
     'force',
     abbr: 'f',
-    defaultsTo: false,
     help: 'Overwrite a previously uploaded package.',
   );
   argParser.addFlag(
     'dry_run',
-    defaultsTo: false,
     negatable: false,
     help: 'Prints gsutil commands instead of executing them.',
   );
   argParser.addFlag(
     'help',
-    defaultsTo: false,
     negatable: false,
     help: 'Print help for this command.',
   );

dev/bots/test.dart

@@ -645,7 +645,7 @@ Future<void> _runFrameworkTests() async {
 
   Future<void> runLibraries() async {
     final List<String> tests = Directory(path.join(flutterRoot, 'packages', 'flutter', 'test'))
-      .listSync(followLinks: false, recursive: false)
+      .listSync(followLinks: false)
       .whereType<Directory>()
       .where((Directory dir) => dir.path.endsWith('widgets') == false)
       .map<String>((Directory dir) => path.join('test', path.basename(dir.path)) + path.separator)
@@ -1215,7 +1215,7 @@ Future<void> _ensureChromeDriverIsRunning() async {
   final Uri chromeDriverUrl = Uri.parse('http://localhost:4444/status');
   final HttpClientRequest request = await client.getUrl(chromeDriverUrl);
   final HttpClientResponse response = await request.close();
-  final Map<String, dynamic> webDriverStatus = json.decode(await response.transform(utf8.decoder).join('')) as Map<String, dynamic>;
+  final Map<String, dynamic> webDriverStatus = json.decode(await response.transform(utf8.decoder).join()) as Map<String, dynamic>;
   client.close();
   final bool webDriverReady = (webDriverStatus['value'] as Map<String, dynamic>)['ready'] as bool;
   if (!webDriverReady) {

dev/bots/test/analyze_test.dart

@@ -193,6 +193,6 @@ void main() {
         const Hash256(0xA8100AE6AA1940D0, 0xB663BB31CD466142, 0xEBBDBD5187131B92, 0xD93818987832EB89), // sha256("\xff")
         const Hash256(0x155644D3F13D98BF, 0, 0, 0),
       },
-    ), exitCode: 0);
+    ));
   });
 }

dev/bots/test/prepare_package_test.dart

@@ -266,7 +266,6 @@ void main() {
           tempDir,
           testRef,
           Branch.dev,
-          strict: true,
           processManager: processManager,
           subprocessOutput: false,
           platform: platform,
@@ -495,7 +494,7 @@ void main() {
           '$gsutilCall -- stat $gsArchivePath': <ProcessResult>[ProcessResult(0, 0, '', '')],
         };
         processManager.addCommands(convertResults(calls));
-        expect(() async => publisher.publishArchive(false), throwsException);
+        expect(() async => publisher.publishArchive(), throwsException);
       });
 
       test('publishArchive does not throw if forceUpload is true and artifact already exists on cloud storage', () async {

dev/bots/unpublish_package.dart

@@ -401,7 +401,6 @@ Future<void> main(List<String> rawArguments) async {
   final ArgParser argParser = ArgParser();
   argParser.addOption(
     'temp_dir',
-    defaultsTo: null,
     help: 'A location where temporary files may be written. Defaults to a '
         'directory in the system temp folder. If a temp_dir is not '
         'specified, then by default a generated temporary directory will be '
@@ -431,7 +430,6 @@ Future<void> main(List<String> rawArguments) async {
   );
   argParser.addFlag(
     'confirm',
-    defaultsTo: false,
     help: 'If set, will actually remove the archive from Google Cloud Storage '
         'upon successful execution of this script. Published archives will be '
         'removed from this directory: $baseUrl$releaseFolder.  This option '
@@ -440,7 +438,6 @@ Future<void> main(List<String> rawArguments) async {
   );
   argParser.addFlag(
     'help',
-    defaultsTo: false,
     negatable: false,
     help: 'Print help for this command.',
   );

dev/conductor/core/lib/src/repository.dart

@@ -496,7 +496,6 @@ class FrameworkRepository extends Repository {
         name: RemoteName.upstream,
         url: 'file://$upstreamPath/',
       ),
-      localUpstream: false,
       previousCheckoutLocation: previousCheckoutLocation,
     );
   }

dev/conductor/core/lib/src/roll_dev.dart

@@ -43,7 +43,6 @@ class RollDevCommand extends Command<void> {
       kCandidateBranch,
       help: 'Specifies which git branch to roll to the dev branch. Required.',
       valueHelp: 'branch',
-      defaultsTo: null, // This option is required
     );
     argParser.addFlag(
       kForce,

dev/conductor/core/lib/src/state.dart

@@ -42,10 +42,10 @@ String presentState(pb.ConductorState state) {
   buffer.writeln('Conductor version: ${state.conductorVersion}');
   buffer.writeln('Release channel: ${state.releaseChannel}');
   buffer.writeln('Release version: ${state.releaseVersion}');
-  buffer.writeln('');
+  buffer.writeln();
   buffer.writeln('Release started at: ${DateTime.fromMillisecondsSinceEpoch(state.createdDate.toInt())}');
   buffer.writeln('Last updated at: ${DateTime.fromMillisecondsSinceEpoch(state.lastUpdatedDate.toInt())}');
-  buffer.writeln('');
+  buffer.writeln();
   buffer.writeln('Engine Repo');
   buffer.writeln('\tCandidate branch: ${state.engine.candidateBranch}');
   buffer.writeln('\tStarting git HEAD: ${state.engine.startingGitHead}');
@@ -77,7 +77,7 @@ String presentState(pb.ConductorState state) {
   } else {
     buffer.writeln('0 Framework cherrypicks.');
   }
-  buffer.writeln('');
+  buffer.writeln();
   if (state.currentPhase == ReleasePhase.VERIFY_RELEASE) {
     buffer.writeln(
       '${state.releaseChannel} release ${state.releaseVersion} has been published and verified.\n',
@@ -88,7 +88,7 @@ String presentState(pb.ConductorState state) {
   buffer.writeln(presentPhases(state.currentPhase));
 
   buffer.writeln(phaseInstructions(state));
-  buffer.writeln('');
+  buffer.writeln();
   buffer.writeln('Issue `conductor next` when you are ready to proceed.');
   return buffer.toString();
 }

dev/conductor/core/lib/src/status.dart

@@ -30,7 +30,6 @@ class StatusCommand extends Command<void> {
     argParser.addFlag(
       kVerboseFlag,
       abbr: 'v',
-      defaultsTo: false,
       help: 'Also print logs.',
     );
   }

dev/conductor/core/test/repository_test.dart

@@ -56,7 +56,7 @@ void main() {
           'cherry-pick',
           '--no-commit',
           commit,
-        ], exitCode: 0),
+        ]),
         const FakeCommand(command: <String>[
           'git',
           'reset',

dev/conductor/core/test/roll_dev_test.dart

@@ -174,7 +174,7 @@ void main() {
         ),
         false,
       );
-      expect(stdio.logs.join('').contains(nextVersion), true);
+      expect(stdio.logs.join().contains(nextVersion), true);
     });
 
     test("exits with exception if --skip-tagging is provided but commit isn't already tagged", () {

dev/conductor/ui/lib/main.dart

@@ -53,7 +53,6 @@ class MyApp extends StatelessWidget {
           padding: const EdgeInsets.all(20.0),
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
-            mainAxisAlignment: MainAxisAlignment.start,
             children: <Widget>[
               const SelectableText(
                 'Desktop app for managing a release of the Flutter SDK, currently in development',

dev/conductor/ui/lib/widgets/progression.dart

@@ -75,12 +75,7 @@ class MainProgressionState extends State<MainProgression> {
               stateFilePath: widget.stateFilePath,
             ),
             Stepper(
-              controlsBuilder: (BuildContext context, ControlsDetails details) {
+              controlsBuilder: (BuildContext context, ControlsDetails details) => Row(),
-                return Row(
-                  children: const <Widget>[],
-                );
-              },
-              type: StepperType.vertical,
               physics: const ScrollPhysics(),
               currentStep: _completedStep,
               onStepContinue: nextStep,
@@ -127,9 +122,7 @@ class MainProgressionState extends State<MainProgression> {
                 ),
                 Step(
                   title: Text(MainProgression._stepTitles[4]),
-                  content: Column(
+                  content: Column(),
-                    children: const <Widget>[],
-                  ),
                   isActive: true,
                   state: handleStepState(4),
                 ),

dev/conductor/ui/test/widgets/stepper_test.dart

@@ -18,7 +18,6 @@ void main() {
               child: Column(
                 children: const <Widget>[
                   MainProgression(
-                    releaseState: null,
                     stateFilePath: './testPath',
                   ),
                 ],
@@ -62,7 +61,6 @@ void main() {
               child: Column(
                 children: const <Widget>[
                   MainProgression(
-                    releaseState: null,
                     stateFilePath: './testPath',
                   ),
                 ],

dev/customer_testing/run_tests.dart

@@ -41,22 +41,18 @@ Future<bool> run(List<String> arguments) async {
     )
     ..addFlag(
       'skip-on-fetch-failure',
-      defaultsTo: false,
       help: 'Whether to skip tests that we fail to download.',
     )
     ..addFlag(
       'skip-template',
-      defaultsTo: false,
       help: 'Whether to skip tests named "template.test".',
     )
     ..addFlag(
       'verbose',
-      defaultsTo: false,
       help: 'Describe what is happening in detail.',
     )
     ..addFlag(
       'help',
-      defaultsTo: false,
       negatable: false,
       help: 'Print this help message.',
     );

dev/devicelab/bin/run.dart

@@ -239,7 +239,6 @@ final ArgParser _argParser = ArgParser()
   ..addMultiOption(
     'task',
     abbr: 't',
-    splitCommas: true,
     help: 'Either:\n'
         ' - the name of a task defined in manifest.yaml.\n'
         '   Example: complex_layout__start_up.\n'
@@ -362,13 +361,10 @@ final ArgParser _argParser = ArgParser()
   )
   ..addFlag(
     'silent',
-    negatable: true,
-    defaultsTo: false,
   )
   ..addMultiOption(
     'test',
     hide: true,
-    splitCommas: true,
     callback: (List<String> value) {
       if (value.isNotEmpty) {
         throw const FormatException(

dev/devicelab/bin/tasks/animated_image_gc_perf.dart

@@ -13,7 +13,5 @@ Future<void> main() async {
     '${flutterDirectory.path}/dev/benchmarks/macrobenchmarks',
     'test_driver/animated_image.dart',
     'animated_image',
-    measureCpuGpu: true,
-    measureMemory: true,
   ).run);
 }

dev/devicelab/bin/tasks/complex_layout_scroll_perf_ios__timeline_summary.dart

@@ -8,5 +8,5 @@ import 'package:flutter_devicelab/tasks/perf_tests.dart';
 
 Future<void> main() async {
   deviceOperatingSystem = DeviceOperatingSystem.ios;
-  await task(createComplexLayoutScrollPerfTest(measureCpuGpu: true));
+  await task(createComplexLayoutScrollPerfTest());
 }

dev/devicelab/bin/tasks/ios_app_with_extensions_test.dart

@@ -115,7 +115,6 @@ Future<void> main() async {
           'list',
           'runtimes',
         ],
-        canFail: false,
         workingDirectory: flutterDirectory.path,
       );
 
@@ -166,7 +165,6 @@ Future<void> main() async {
           'com.apple.CoreSimulator.SimDeviceType.iPhone-11',
           iOSSimRuntime,
         ],
-        canFail: false,
         workingDirectory: flutterDirectory.path,
       );
 
@@ -180,7 +178,6 @@ Future<void> main() async {
           'com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-5-44mm',
           watchSimRuntime,
         ],
-        canFail: false,
         workingDirectory: flutterDirectory.path,
       );
 
@@ -188,7 +185,6 @@ Future<void> main() async {
       await eval(
         'xcrun',
         <String>['simctl', 'pair', watchDeviceID, phoneDeviceID],
-        canFail: false,
         workingDirectory: flutterDirectory.path,
       );
 
@@ -196,13 +192,11 @@ Future<void> main() async {
       await eval(
         'xcrun',
         <String>['simctl', 'bootstatus', phoneDeviceID, '-b'],
-        canFail: false,
         workingDirectory: flutterDirectory.path,
       );
       await eval(
         'xcrun',
         <String>['simctl', 'bootstatus', watchDeviceID, '-b'],
-        canFail: false,
         workingDirectory: flutterDirectory.path,
       );
 

dev/devicelab/bin/tasks/large_image_changer_perf_ios.dart

@@ -13,8 +13,6 @@ Future<void> main() async {
     '${flutterDirectory.path}/dev/benchmarks/macrobenchmarks',
     'test_driver/large_image_changer.dart',
     'large_image_changer',
-    measureCpuGpu: true,
-    measureMemory: true,
     // This benchmark doesn't care about frame times, frame times will be heavily
     // impacted by IO time for loading the image initially.
     benchmarkScoreKeys: <String>[

dev/devicelab/bin/tasks/post_backdrop_filter_perf_ios__timeline_summary.dart

@@ -8,5 +8,5 @@ import 'package:flutter_devicelab/tasks/perf_tests.dart';
 
 Future<void> main() async {
   deviceOperatingSystem = DeviceOperatingSystem.ios;
-  await task(createPostBackdropFilterPerfTest(measureCpuGpu: true));
+  await task(createPostBackdropFilterPerfTest());
 }

dev/devicelab/bin/tasks/routing_test.dart

@@ -32,7 +32,6 @@ void main() {
           '/smuggle-it',
           'lib/route.dart',
         ],
-        canFail: false,
       );
     });
     section('TEST WHETHER `flutter run --route` WORKS');

dev/devicelab/bin/tasks/simple_animation_perf_ios.dart

@@ -8,5 +8,5 @@ import 'package:flutter_devicelab/tasks/perf_tests.dart';
 
 Future<void> main() async {
   deviceOperatingSystem = DeviceOperatingSystem.ios;
-  await task(createSimpleAnimationPerfTest(measureCpuGpu: true));
+  await task(createSimpleAnimationPerfTest());
 }

dev/devicelab/lib/command/test.dart

@@ -49,8 +49,6 @@ class TestCommand extends Command<void> {
             'task, will write test results to the file.');
     argParser.addFlag(
       'silent',
-      negatable: true,
-      defaultsTo: false,
     );
   }
 

dev/devicelab/lib/framework/devices.dart

@@ -274,7 +274,7 @@ class AndroidDeviceDiscovery implements DeviceDiscovery {
 
   @override
   Future<List<String>> discoverDevices() async {
-    final List<String> output = (await eval(adbPath, <String>['devices', '-l'], canFail: false))
+    final List<String> output = (await eval(adbPath, <String>['devices', '-l']))
         .trim().split('\n');
     final List<String> results = <String>[];
     for (final String line in output) {
@@ -327,7 +327,7 @@ class AndroidDeviceDiscovery implements DeviceDiscovery {
     // Restarting `adb` helps with keeping device connections alive. When `adb`
     // runs non-stop for too long it loses connections to devices. There may be
     // a better method, but so far that's the best one I've found.
-    await exec(adbPath, <String>['kill-server'], canFail: false);
+    await exec(adbPath, <String>['kill-server']);
   }
 }
 
@@ -555,7 +555,6 @@ class AndroidDevice extends Device {
       adbPath,
       <String>['-s', deviceId, ...arguments],
       environment: environment,
-      canFail: false,
       printStdout: !silent,
       printStderr: !silent,
     );

dev/devicelab/lib/framework/utils.dart

@@ -224,7 +224,7 @@ Future<String> getDartVersion() async {
 
 Future<String?> getCurrentFlutterRepoCommit() {
   if (!dir('${flutterDirectory.path}/.git').existsSync()) {
-    return Future<String?>.value(null);
+    return Future<String?>.value();
   }
 
   return inDirectory<String>(flutterDirectory, () {

dev/devicelab/lib/tasks/dart_plugin_registry_tests.dart

@@ -145,7 +145,6 @@ class PluginPlatformInterfaceMacOS {
         final Process run = await startProcess(
           path.join(flutterDirectory.path, 'bin', 'flutter'),
           flutterCommandArgs('run', <String>['-d', 'macos', '-v']),
-          environment: null,
         );
         Completer<void> registryExecutedCompleter = Completer<void>();
         final StreamSubscription<void> subscription = run.stdout

dev/devicelab/lib/tasks/web_benchmarks.dart

@@ -133,8 +133,6 @@ Future<TaskResult> runWebBenchmark({ required bool useCanvasKit }) async {
       final ChromeOptions options = ChromeOptions(
         url: 'http://localhost:$benchmarkServerPort/index.html',
         userDataDirectory: userDataDir,
-        windowHeight: 1024,
-        windowWidth: 1024,
         headless: isUncalibratedSmokeTest,
         debugPort: chromeDebugPort,
       );

dev/devicelab/test/adb_test.dart

@@ -27,8 +27,8 @@ void main() {
         final AndroidDevice androidDevice = device as AndroidDevice;
         expect(await androidDevice.isArm64(), isTrue);
         expectLog(<CommandArgs>[
-          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk']),
-          cmd(command: 'getprop', arguments: <String>['ro.product.cpu.abi'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.product.cpu.abi']),
         ]);
       });
     });
@@ -51,7 +51,7 @@ void main() {
       test('sends power event', () async {
         await device.togglePower();
         expectLog(<CommandArgs>[
-          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk']),
           cmd(command: 'input', arguments: <String>['keyevent', '26']),
         ]);
       });
@@ -62,7 +62,7 @@ void main() {
         FakeDevice.pretendAwake();
         await device.wakeUp();
         expectLog(<CommandArgs>[
-          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk']),
           cmd(command: 'dumpsys', arguments: <String>['power']),
         ]);
       });
@@ -71,7 +71,7 @@ void main() {
         FakeDevice.pretendAsleep();
         await device.wakeUp();
         expectLog(<CommandArgs>[
-          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk']),
           cmd(command: 'dumpsys', arguments: <String>['power']),
           cmd(command: 'input', arguments: <String>['keyevent', '26']),
         ]);
@@ -83,7 +83,7 @@ void main() {
         FakeDevice.pretendAsleep();
         await device.sendToSleep();
         expectLog(<CommandArgs>[
-          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk']),
           cmd(command: 'dumpsys', arguments: <String>['power']),
         ]);
       });
@@ -92,7 +92,7 @@ void main() {
         FakeDevice.pretendAwake();
         await device.sendToSleep();
         expectLog(<CommandArgs>[
-          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk']),
           cmd(command: 'dumpsys', arguments: <String>['power']),
           cmd(command: 'input', arguments: <String>['keyevent', '26']),
         ]);
@@ -104,7 +104,7 @@ void main() {
         FakeDevice.pretendAwake();
         await device.unlock();
         expectLog(<CommandArgs>[
-          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk']),
           cmd(command: 'dumpsys', arguments: <String>['power']),
           cmd(command: 'input', arguments: <String>['keyevent', '82']),
         ]);
@@ -115,7 +115,7 @@ void main() {
       test('tap', () async {
         await device.tap(100, 200);
         expectLog(<CommandArgs>[
-          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk']),
           cmd(command: 'input', arguments: <String>['tap', '100', '200']),
         ]);
       });

dev/devicelab/test/running_processes_test.dart

@@ -61,7 +61,7 @@ Sat Mar  9 20:13:00 2019        49 /usr/sbin/syslogd
           ),
           RunningProcessInfo(
             '49',
-            DateTime(2019, 3, 9, 20, 13, 00),
+            DateTime(2019, 3, 9, 20, 13),
             '/usr/sbin/syslogd',
           ),
         ]));

dev/integration_tests/android_semantics_testing/lib/src/tests/text_field_page.dart

@@ -32,14 +32,12 @@ class _TextFieldPageState extends State<TextFieldPage> {
           TextField(
             key: normalTextFieldKey,
             controller: _normalController,
-            autofocus: false,
           ),
           const Spacer(),
           TextField(
             key: passwordTextFieldKey,
             controller: _passwordController,
             obscureText: true,
-            autofocus: false,
           ),
         ],
       ),

dev/integration_tests/android_views/lib/motion_events_page.dart

@@ -227,7 +227,7 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
         setState(() {});
         break;
     }
-    return Future<dynamic>.value(null);
+    return Future<dynamic>.value();
   }
 
   Future<dynamic> onViewMethodChannelCall(MethodCall call) {
@@ -240,7 +240,7 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
         setState(() {});
         break;
     }
-    return Future<dynamic>.value(null);
+    return Future<dynamic>.value();
   }
 
   Widget buildEventTile(BuildContext context, int index) {

dev/integration_tests/channels/lib/src/method_calls.dart

@@ -10,8 +10,7 @@ import 'test_step.dart';
 Future<TestStepResult> methodCallJsonSuccessHandshake(dynamic payload) async {
   const MethodChannel channel =
       MethodChannel('json-method', JSONMethodCodec());
-  return _methodCallSuccessHandshake(
+  return _methodCallSuccessHandshake('JSON success($payload)', channel, payload);
-      'JSON success($payload)', channel, payload);
 }
 
 Future<TestStepResult> methodCallJsonErrorHandshake(dynamic payload) async {
@@ -32,8 +31,7 @@ Future<TestStepResult> methodCallStandardSuccessHandshake(
     'std-method',
     StandardMethodCodec(ExtendedStandardMessageCodec()),
   );
-  return _methodCallSuccessHandshake(
+  return _methodCallSuccessHandshake('Standard success($payload)', channel, payload);
-      'Standard success($payload)', channel, payload);
 }
 
 Future<TestStepResult> methodCallStandardErrorHandshake(dynamic payload) async {
@@ -41,8 +39,7 @@ Future<TestStepResult> methodCallStandardErrorHandshake(dynamic payload) async {
     'std-method',
     StandardMethodCodec(ExtendedStandardMessageCodec()),
   );
-  return _methodCallErrorHandshake(
+  return _methodCallErrorHandshake('Standard error($payload)', channel, payload);
-      'Standard error($payload)', channel, payload);
 }
 
 Future<TestStepResult> methodCallStandardNotImplementedHandshake() async {
@@ -50,8 +47,7 @@ Future<TestStepResult> methodCallStandardNotImplementedHandshake() async {
     'std-method',
     StandardMethodCodec(ExtendedStandardMessageCodec()),
   );
-  return _methodCallNotImplementedHandshake(
+  return _methodCallNotImplementedHandshake('Standard notImplemented()', channel);
-      'Standard notImplemented()', channel);
 }
 
 Future<TestStepResult> _methodCallSuccessHandshake(
@@ -89,8 +85,7 @@ Future<TestStepResult> _methodCallErrorHandshake(
   final List<dynamic> received = <dynamic>[];
   channel.setMethodCallHandler((MethodCall call) async {
     received.add(call.arguments);
-    throw PlatformException(
+    throw PlatformException(code: 'error', details: arguments);
-        code: 'error', message: null, details: arguments);
   });
   dynamic errorDetails = nothing;
   dynamic error = nothing;

dev/integration_tests/flutter_gallery/lib/demo/animation/widgets.dart

@@ -23,8 +23,6 @@ class SectionCard extends StatelessWidget {
       child: DecoratedBox(
         decoration: BoxDecoration(
           gradient: LinearGradient(
-            begin: Alignment.centerLeft,
-            end: Alignment.centerRight,
             colors: <Color>[
               section.leftColor!,
               section.rightColor!,
@@ -132,7 +130,6 @@ class SectionDetailView extends StatelessWidget {
             package: detail.imageAssetPackage,
           ),
           fit: BoxFit.cover,
-          alignment: Alignment.center,
         ),
       ),
     );

dev/integration_tests/flutter_gallery/lib/demo/calculator/logic.dart

@@ -136,7 +136,7 @@ class CalcExpression {
   /// in the calculator's display panel.
   @override
   String toString() {
-    final StringBuffer buffer = StringBuffer('');
+    final StringBuffer buffer = StringBuffer();
     buffer.writeAll(_list);
     return buffer.toString();
   }

dev/integration_tests/flutter_gallery/lib/demo/colors_demo.dart

@@ -67,7 +67,6 @@ class ColorItem extends StatelessWidget {
           bottom: false,
           child: Row(
             mainAxisAlignment: MainAxisAlignment.spaceBetween,
-            crossAxisAlignment: CrossAxisAlignment.center,
             children: <Widget>[
               Text('$prefix$index'),
               Text(colorString()),

dev/integration_tests/flutter_gallery/lib/demo/cupertino/cupertino_navigation_demo.dart

@@ -327,7 +327,6 @@ class Tab1ItemPageState extends State<Tab1ItemPage> {
             Padding(
               padding: const EdgeInsets.symmetric(horizontal: 16.0),
               child: Row(
-                mainAxisSize: MainAxisSize.max,
                 children: <Widget>[
                   Container(
                     height: 128.0,

dev/integration_tests/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart

@@ -247,7 +247,6 @@ class _CupertinoPickerDemoState extends State<CupertinoPickerDemo> {
             return _BottomPicker(
               child: CupertinoDatePicker(
                 backgroundColor: CupertinoColors.systemBackground.resolveFrom(context),
-                mode: CupertinoDatePickerMode.dateAndTime,
                 initialDateTime: dateTime,
                 onDateTimeChanged: (DateTime newDateTime) {
                   setState(() => dateTime = newDateTime);

dev/integration_tests/flutter_gallery/lib/demo/cupertino/cupertino_segmented_control_demo.dart

@@ -117,13 +117,11 @@ class _CupertinoSegmentedControlDemoState extends State<CupertinoSegmentedContro
                               BoxShadow(
                                 offset: Offset(0.0, 6.0),
                                 blurRadius: 10.0,
-                                spreadRadius: 0.0,
                                 color: _kKeyPenumbraOpacity,
                               ),
                               BoxShadow(
                                 offset: Offset(0.0, 1.0),
                                 blurRadius: 18.0,
-                                spreadRadius: 0.0,
                                 color: _kAmbientShadowOpacity,
                               ),
                             ],

dev/integration_tests/flutter_gallery/lib/demo/cupertino/cupertino_slider_demo.dart

@@ -42,7 +42,6 @@ class _CupertinoSliderDemoState extends State<CupertinoSliderDemo> {
                   children: <Widget> [
                     CupertinoSlider(
                       value: _value,
-                      min: 0.0,
                       max: 100.0,
                       onChanged: (double value) {
                         setState(() {
@@ -58,7 +57,6 @@ class _CupertinoSliderDemoState extends State<CupertinoSliderDemo> {
                   children: <Widget> [
                     CupertinoSlider(
                       value: _discreteValue,
-                      min: 0.0,
                       max: 100.0,
                       divisions: 5,
                       onChanged: (double value) {

dev/integration_tests/flutter_gallery/lib/demo/material/bottom_app_bar_demo.dart

@@ -27,7 +27,6 @@ class _BottomAppBarDemoState extends State<BottomAppBarDemo> {
   static const _ChoiceValue<Widget> kNoFab = _ChoiceValue<Widget>(
     title: 'None',
     label: 'do not show a floating action button',
-    value: null,
   );
 
   static const _ChoiceValue<Widget> kCircularFab = _ChoiceValue<Widget>(

dev/integration_tests/flutter_gallery/lib/demo/material/buttons_demo.dart

@@ -275,7 +275,6 @@ class _ButtonsDemoState extends State<ButtonsDemo> {
     return Padding(
       padding: const EdgeInsets.all(24.0),
       child: Column(
-        mainAxisAlignment: MainAxisAlignment.start,
         children: <Widget>[
           ListTile(
             title: const Text('Simple dropdown:'),

dev/integration_tests/flutter_gallery/lib/demo/material/chip_demo.dart

@@ -344,7 +344,7 @@ class _ChipDemoState extends State<ChipDemo> {
         data: _showShapeBorder
             ? theme.chipTheme.copyWith(
                 shape: BeveledRectangleBorder(
-                side: const BorderSide(width: 0.66, style: BorderStyle.solid, color: Colors.grey),
+                side: const BorderSide(width: 0.66, color: Colors.grey),
                 borderRadius: BorderRadius.circular(10.0),
               ))
             : theme.chipTheme,

dev/integration_tests/flutter_gallery/lib/demo/material/dialog_demo.dart

@@ -33,8 +33,6 @@ class DialogDemoItem extends StatelessWidget {
     return SimpleDialogOption(
       onPressed: onPressed,
       child: Row(
-        mainAxisAlignment: MainAxisAlignment.start,
-        crossAxisAlignment: CrossAxisAlignment.center,
         children: <Widget>[
           Icon(icon, size: 36.0, color: color),
           Padding(

dev/integration_tests/flutter_gallery/lib/demo/material/expansion_panels_demo.dart

@@ -308,7 +308,6 @@ class _ExpansionPanelsDemoState extends State<ExpansionPanelsDemo> {
                         // Allow room for the value indicator.
                         padding: const EdgeInsets.only(top: 44.0),
                         child: Slider(
-                          min: 0.0,
                           max: 100.0,
                           divisions: 5,
                           activeColor: Colors.orange[100 + (field.value! * 5.0).round()],

dev/integration_tests/flutter_gallery/lib/demo/material/slider_demo.dart

@@ -284,7 +284,6 @@ class _SlidersState extends State<_Sliders> {
               Slider.adaptive(
                 label: _continuousValue.toStringAsFixed(6),
                 value: _continuousValue,
-                min: 0.0,
                 max: 100.0,
                 onChanged: (double value) {
                   setState(() {
@@ -307,7 +306,6 @@ class _SlidersState extends State<_Sliders> {
             children: <Widget>[
               Slider.adaptive(
                 value: _discreteValue,
-                min: 0.0,
                 max: 200.0,
                 divisions: 5,
                 label: '${_discreteValue.round()}',
@@ -338,7 +336,6 @@ class _SlidersState extends State<_Sliders> {
                 ),
                 child: Slider(
                   value: _discreteCustomValue,
-                  min: 0.0,
                   max: 200.0,
                   divisions: 5,
                   semanticFormatterCallback: (double value) => value.round().toString(),
@@ -381,7 +378,6 @@ class _RangeSlidersState extends State<_RangeSliders> {
             children: <Widget>[
               RangeSlider(
                 values: _continuousValues,
-                min: 0.0,
                 max: 100.0,
                 onChanged: (RangeValues values) {
                   setState(() {
@@ -404,7 +400,6 @@ class _RangeSlidersState extends State<_RangeSliders> {
             children: <Widget>[
               RangeSlider(
                 values: _discreteValues,
-                min: 0.0,
                 max: 200.0,
                 divisions: 5,
                 labels: RangeLabels('${_discreteValues.start.round()}', '${_discreteValues.end.round()}'),
@@ -433,7 +428,6 @@ class _RangeSlidersState extends State<_RangeSliders> {
                 ),
                 child: RangeSlider(
                   values: _discreteCustomValues,
-                  min: 0.0,
                   max: 200.0,
                   divisions: 5,
                   labels: RangeLabels('${_discreteCustomValues.start.round()}', '${_discreteCustomValues.end.round()}'),

dev/integration_tests/flutter_gallery/lib/demo/material/tabs_demo.dart

@@ -107,7 +107,6 @@ class _CardDataItem extends StatelessWidget {
         padding: const EdgeInsets.all(16.0),
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.stretch,
-          mainAxisAlignment: MainAxisAlignment.start,
           children: <Widget>[
             Align(
               alignment: page!.id == 'H'

dev/integration_tests/flutter_gallery/lib/demo/material/text_form_field_demo.dart

@@ -252,7 +252,6 @@ class TextFormFieldDemoState extends State<TextFormFieldDemo> {
                       suffixText: 'USD',
                       suffixStyle: TextStyle(color: Colors.green),
                     ),
-                    maxLines: 1,
                   ),
                   const SizedBox(height: 24.0),
                   PasswordField(

dev/integration_tests/flutter_gallery/lib/demo/shrine/expanding_bottom_sheet.dart

@@ -171,7 +171,7 @@ class ExpandingBottomSheetState extends State<ExpandingBottomSheet> with TickerP
       ).animate(
         CurvedAnimation(
           parent: _controller.view,
-          curve: const Interval(0.434, 1.0, curve: Curves.linear), // not used
+          curve: const Interval(0.434, 1.0), // not used
           // only the reverseCurve will be used
           reverseCurve: Interval(0.434, 1.0, curve: Curves.fastOutSlowIn.flipped),
         ),
@@ -448,7 +448,7 @@ class _ProductThumbnailRowState extends State<ProductThumbnailRow> {
     );
 
     final Animation<double> opacity = CurvedAnimation(
-      curve: const Interval(0.33, 1.0, curve: Curves.linear),
+      curve: const Interval(0.33, 1.0),
       parent: animation,
     );
 

dev/integration_tests/flutter_gallery/lib/demo/shrine/shopping_cart.dart

@@ -124,7 +124,6 @@ class ShoppingCartSummary extends StatelessWidget {
             child: Column(
               children: <Widget>[
                 Row(
-                  crossAxisAlignment: CrossAxisAlignment.center,
                   children: <Widget>[
                     const Expanded(
                       child: Text('TOTAL'),

dev/integration_tests/flutter_gallery/lib/demo/shrine/supplemental/product_card.dart

@@ -45,7 +45,6 @@ class ProductCard extends StatelessWidget {
         children: <Widget>[
           Column(
             mainAxisAlignment: MainAxisAlignment.center,
-            crossAxisAlignment: CrossAxisAlignment.center,
             children: <Widget>[
               AspectRatio(
                 aspectRatio: imageAspectRatio,
@@ -56,7 +55,6 @@ class ProductCard extends StatelessWidget {
                 width: 121.0,
                 child: Column(
                   mainAxisAlignment: MainAxisAlignment.end,
-                  crossAxisAlignment: CrossAxisAlignment.center,
                   children: <Widget>[
                     Text(
                       product == null ? '' : product!.name,

dev/integration_tests/flutter_gallery/lib/gallery/example_code.dart

@@ -253,7 +253,6 @@ class GridLists {
 // loaded from the web.
 GridView.count(
   crossAxisCount: 3,
-  childAspectRatio: 1.0,
   padding: const EdgeInsets.all(4.0),
   mainAxisSpacing: 4.0,
   crossAxisSpacing: 4.0,

dev/integration_tests/flutter_gallery/lib/gallery/home.dart

@@ -58,14 +58,12 @@ class _CategoryItem extends StatelessWidget {
     // repainted when the button's ink splash animates.
     return RepaintBoundary(
       child: RawMaterialButton(
-        padding: EdgeInsets.zero,
         hoverColor: theme.primaryColor.withOpacity(0.05),
         splashColor: theme.primaryColor.withOpacity(0.12),
         highlightColor: Colors.transparent,
         onPressed: onTap,
         child: Column(
           mainAxisAlignment: MainAxisAlignment.end,
-          crossAxisAlignment: CrossAxisAlignment.center,
           children: <Widget>[
             Padding(
               padding: const EdgeInsets.all(6.0),
@@ -184,7 +182,6 @@ class _DemoItem extends StatelessWidget {
     final bool isDark = theme.brightness == Brightness.dark;
     final double textScaleFactor = MediaQuery.textScaleFactorOf(context);
     return RawMaterialButton(
-      padding: EdgeInsets.zero,
       splashColor: theme.primaryColor.withOpacity(0.12),
       highlightColor: Colors.transparent,
       onPressed: () {

dev/integration_tests/flutter_gallery/test/smoke_test.dart

@@ -162,7 +162,7 @@ Future<void> smokeGallery(WidgetTester tester) async {
     await tester.tap(find.text(category.name));
     await tester.pumpAndSettle();
     for (final GalleryDemo demo in kGalleryCategoryToDemos[category]!) {
-      await Scrollable.ensureVisible(tester.element(find.text(demo.title)), alignment: 0.0);
+      await Scrollable.ensureVisible(tester.element(find.text(demo.title)));
       await smokeDemo(tester, demo);
       tester.binding.debugAssertNoTransientCallbacks('A transient callback was still active after running $demo');
     }

dev/integration_tests/flutter_gallery/test_driver/run_demos.dart

@@ -45,7 +45,7 @@ Future<void> runDemos(List<String> demos, WidgetController controller) async {
       await controller.pumpAndSettle();
       // Scroll back to the top
       await controller.drag(demoList, const Offset(0.0, 10000.0));
-      await controller.pumpAndSettle(const Duration(milliseconds: 100));
+      await controller.pumpAndSettle();
     }
     currentDemoCategory = demoCategory;
 

dev/integration_tests/flutter_gallery/test_driver/transitions_perf_e2e.dart

@@ -31,7 +31,7 @@ void main([List<String> args = const <String>[]]) {
       await tester.pumpAndSettle();
       final int id = tester.getSemantics(find.bySemanticsLabel('Material')).id;
       expect(id, greaterThan(-1));
-    }, skip: !withSemantics, semanticsEnabled: true);
+    }, skip: !withSemantics);
 
     testWidgets(
       'all demos',

dev/integration_tests/flutter_gallery/test_memory/memory_nav.dart

@@ -31,7 +31,6 @@ Future<void> main() async {
     },
     behavior: HitTestBehavior.opaque,
     child: const IgnorePointer(
-      ignoring: true,
       child: GalleryApp(testMode: true),
     ),
   ));

dev/integration_tests/hybrid_android_views/lib/motion_events_page.dart

@@ -199,7 +199,7 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
         setState(() {});
         break;
     }
-    return Future<dynamic>.value(null);
+    return Future<dynamic>.value();
   }
 
   Future<dynamic> onViewMethodChannelCall(MethodCall call) {
@@ -212,7 +212,7 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
         setState(() {});
         break;
     }
-    return Future<dynamic>.value(null);
+    return Future<dynamic>.value();
   }
 
   Widget buildEventTile(BuildContext context, int index) {

dev/integration_tests/web_e2e_tests/lib/scroll_wheel_main.dart

@@ -105,6 +105,5 @@ void dispatchMouseWheelEvent(int mouseX, int mouseY,
     deltaMode: deltaMode,
     deltaX : deltaX,
     deltaY : deltaY,
-    shiftKey: false,
   ));
 }

dev/manual_tests/lib/drag_and_drop.dart

@@ -248,13 +248,10 @@ class DragAndDropAppState extends State<DragAndDropApp> {
         children: <Widget>[
           Expanded(
             child: Row(
-              crossAxisAlignment: CrossAxisAlignment.center,
               mainAxisAlignment: MainAxisAlignment.spaceAround,
               children: <Widget>[
                 ExampleDragSource(
                   color: Colors.yellow.shade300,
-                  under: true,
-                  heavy: false,
                   child: const Text('under'),
                 ),
                 ExampleDragSource(
@@ -266,7 +263,6 @@ class DragAndDropAppState extends State<DragAndDropApp> {
                 ExampleDragSource(
                   color: Colors.indigo.shade300,
                   under: false,
-                  heavy: false,
                   child: const Text('above'),
                 ),
               ],

dev/manual_tests/lib/hover.dart

@@ -89,7 +89,6 @@ class _HoverDemoState extends State<HoverDemo> {
                 const Padding(
                   padding: EdgeInsets.all(8.0),
                   child: TextField(
-                    autofocus: false,
                     decoration: InputDecoration(
                       border: OutlineInputBorder(),
                       labelText: 'Enter Text',

dev/manual_tests/lib/text.dart

@@ -96,7 +96,6 @@ class _HomeState extends State<Home> {
           Padding(
             padding: const EdgeInsets.symmetric(horizontal: 20.0),
             child: Slider(
-              min: 0.0,
               max: 1024.0,
               value: seed.toDouble(),
               label: '$seed',

dev/tools/dartdoc.dart

@@ -250,15 +250,15 @@ ArgParser _createArgsParser() {
   final ArgParser parser = ArgParser();
   parser.addFlag('help', abbr: 'h', negatable: false,
       help: 'Show command help.');
-  parser.addFlag('verbose', negatable: true, defaultsTo: true,
+  parser.addFlag('verbose', defaultsTo: true,
       help: 'Whether to report all error messages (on) or attempt to '
           'filter out some known false positives (off).  Shut this off '
           'locally if you want to address Flutter-specific issues.');
-  parser.addFlag('checked', abbr: 'c', negatable: true,
+  parser.addFlag('checked', abbr: 'c',
       help: 'Run dartdoc in checked mode.');
-  parser.addFlag('json', negatable: true,
+  parser.addFlag('json',
       help: 'Display json-formatted output from dartdoc and skip stdout/stderr prefixing.');
-  parser.addFlag('validate-links', negatable: true,
+  parser.addFlag('validate-links',
       help: 'Display warnings for broken links generated by dartdoc (slow)');
   return parser;
 }

dev/tools/examples_smoke_test.dart

@@ -50,7 +50,7 @@ Future<void> cleanUp(File integrationTest) async {
   try {
     await integrationTest.delete();
     // Delete the integration_test directory if it is empty.
-    await integrationTest.parent.delete(recursive: false);
+    await integrationTest.parent.delete();
   } on FileSystemException {
     // Ignore, there might be other files in there preventing it from
     // being removed, or it might not exist.
@@ -205,7 +205,6 @@ Future<String> runCommand(
     process = await processManager.start(
       cmd,
       workingDirectory: workingDirectory.absolute.path,
-      includeParentEnvironment: true,
       environment: environment,
     );
     process.stdout.listen(

dev/tools/gen_keycodes/bin/gen_keycodes.dart

@@ -132,7 +132,6 @@ Future<void> main(List<String> rawArguments) async {
   );
   argParser.addFlag(
     'collect',
-    defaultsTo: false,
     negatable: false,
     help: 'If this flag is set, then collect and parse header files from '
         'Chromium and Android instead of reading pre-parsed data from '
@@ -141,7 +140,6 @@ Future<void> main(List<String> rawArguments) async {
   );
   argParser.addFlag(
     'help',
-    defaultsTo: false,
     negatable: false,
     help: 'Print help for this command.',
   );

dev/tools/gen_keycodes/lib/constants.dart

@@ -22,7 +22,7 @@ class MaskConstant {
     return name
       .split(' ')
       .map<String>((String word) => lowerCamelToUpperCamel(word.toLowerCase()))
-      .join('');
+      .join();
   }
 
   String get lowerCamelName {

dev/tools/gen_keycodes/lib/ios_code_gen.dart

@@ -81,7 +81,7 @@ class IOSCodeGenerator extends PlatformCodeGenerator {
       buffer.write(wrapString(constant.description, prefix: ' * '));
       buffer.writeln(' */');
       buffer.writeln('const uint64_t k${constant.upperCamelName} = ${toHex(constant.value, digits: 11)};');
-      buffer.writeln('');
+      buffer.writeln();
     }
     return buffer.toString().trimRight();
   }

dev/tools/gen_keycodes/lib/keyboard_keys_code_gen.dart

@@ -61,7 +61,7 @@ class KeyboardKeysCodeGenerator extends BaseCodeGenerator {
         '[RawKeyEvent.physicalKey] for more information.');
       lines.add(entry.usbHidCode, '''
 $firstComment  ///
-$otherComments  static const PhysicalKeyboardKey ${entry.constantName} = PhysicalKeyboardKey(${toHex(entry.usbHidCode, digits: 8)});
+$otherComments  static const PhysicalKeyboardKey ${entry.constantName} = PhysicalKeyboardKey(${toHex(entry.usbHidCode)});
 ''');
     }
     return lines.sortedJoin().trimRight();
@@ -71,7 +71,7 @@ $otherComments  static const PhysicalKeyboardKey ${entry.constantName} = Physica
     final OutputLines<int> lines = OutputLines<int>('Physical debug names');
     for (final PhysicalKeyEntry entry in keyData.entries) {
       lines.add(entry.usbHidCode, '''
-      ${toHex(entry.usbHidCode, digits: 8)}: '${entry.commentName}',''');
+      ${toHex(entry.usbHidCode)}: '${entry.commentName}',''');
     }
     return lines.sortedJoin().trimRight();
   }

dev/tools/gen_keycodes/lib/testing_key_codes_gen.dart

@@ -23,7 +23,7 @@ class KeyCodesCcGenerator extends BaseCodeGenerator {
     final OutputLines<int> lines = OutputLines<int>('Physical Key list');
     for (final PhysicalKeyEntry entry in keyData.entries) {
       lines.add(entry.usbHidCode, '''
-constexpr uint64_t kPhysical${_toUpperCammel(entry.constantName)} = ${toHex(entry.usbHidCode, digits: 8)};''');
+constexpr uint64_t kPhysical${_toUpperCammel(entry.constantName)} = ${toHex(entry.usbHidCode)};''');
     }
     return lines.sortedJoin().trimRight();
   }

dev/tools/localization/bin/gen_subtag_registry.dart

@@ -15,7 +15,7 @@ Future<void> main() async {
   final HttpClient client = HttpClient();
   final HttpClientRequest request = await client.getUrl(Uri.parse(registry));
   final HttpClientResponse response = await request.close();
-  final String body = (await response.cast<List<int>>().transform<String>(utf8.decoder).toList()).join('');
+  final String body = (await response.cast<List<int>>().transform<String>(utf8.decoder).toList()).join();
   final File subtagRegistry = File('../language_subtag_registry.dart');
   final File subtagRegistryFlutterTools = File('../../../../packages/flutter_tools/lib/src/localizations/language_subtag_registry.dart');
 

dev/tools/localization/localizations_utils.dart

@@ -118,7 +118,7 @@ class LocaleInfo implements Comparable<LocaleInfo> {
     return originalString
       .split('_')
       .map<String>((String part) => part.substring(0, 1).toUpperCase() + part.substring(1).toLowerCase())
-      .join('');
+      .join();
   }
 
   @override
@@ -232,17 +232,14 @@ GeneratorOptions parseArgs(List<String> rawArgs) {
     ..addFlag(
       'overwrite',
       abbr: 'w',
-      defaultsTo: false,
     )
     ..addFlag(
       'material',
       help: 'Whether to print the generated classes for the Material package only. Ignored when --overwrite is passed.',
-      defaultsTo: false,
     )
     ..addFlag(
       'cupertino',
       help: 'Whether to print the generated classes for the Cupertino package only. Ignored when --overwrite is passed.',
-      defaultsTo: false,
     );
   final argslib.ArgResults args = argParser.parse(rawArgs);
   final bool writeToFile = args['overwrite'] as bool;

dev/tools/mega_gallery.dart

@@ -165,7 +165,7 @@ class SourceStats {
 SourceStats getStatsFor(Directory dir, [SourceStats? stats]) {
   stats ??= SourceStats();
 
-  for (final FileSystemEntity entity in dir.listSync(recursive: false, followLinks: false)) {
+  for (final FileSystemEntity entity in dir.listSync(followLinks: false)) {
     final String name = path.basename(entity.path);
     if (entity is File && name.endsWith('.dart')) {
       stats.files += 1;

dev/tools/update_icons.dart

@@ -212,7 +212,7 @@ ArgResults _handleArguments(List<String> args) {
     ..addOption(_iconsClassPathOption,
         defaultsTo: _defaultIconsPath,
         help: 'Location of the material icons file')
-    ..addFlag(_dryRunOption, defaultsTo: false);
+    ..addFlag(_dryRunOption);
   argParser.addFlag('help', abbr: 'h', negatable: false, callback: (bool help) {
     if (help) {
       print(argParser.usage);
@@ -289,7 +289,7 @@ String _regenerateIconsFile(String iconData, Map<String, String> tokenPairMap) {
     // Generate for Icons
     if (line.contains(_beginGeneratedMark)) {
       generating = true;
-      final String iconDeclarationsString = newIcons.map((_Icon icon) => icon.fullDeclaration).join('');
+      final String iconDeclarationsString = newIcons.map((_Icon icon) => icon.fullDeclaration).join();
       buf.write(iconDeclarationsString);
     } else if (line.contains(_endGeneratedMark)) {
       generating = false;

examples/api/lib/animation/curves/curve2_d.0.dart

@@ -39,7 +39,6 @@ final CatmullRomSpline path = CatmullRomSpline(
   ],
   startHandle: const Offset(0.93, 0.93),
   endHandle: const Offset(0.18, 0.23),
-  tension: 0.0,
 );
 
 class FollowCurve2D extends StatefulWidget {
@@ -74,7 +73,7 @@ class _FollowCurve2DState extends State<FollowCurve2D>
     animation = CurvedAnimation(parent: controller, curve: widget.curve);
     // Have the controller repeat indefinitely.  If you want it to "bounce" back
     // and forth, set the reverse parameter to true.
-    controller.repeat(reverse: false);
+    controller.repeat();
     controller.addListener(() => setState(() {}));
   }
 
@@ -107,7 +106,6 @@ class MyStatelessWidget extends StatelessWidget {
       alignment: Alignment.center,
       child: FollowCurve2D(
         path: path,
-        curve: Curves.easeInOut,
         duration: const Duration(seconds: 3),
         child: CircleAvatar(
           backgroundColor: Colors.yellow,

examples/api/lib/cupertino/refresh/cupertino_sliver_refresh_control.0.dart

@@ -53,8 +53,6 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget> {
             largeTitle: Text('Scroll down'),
           ),
           CupertinoSliverRefreshControl(
-            refreshTriggerPullDistance: 100.0,
-            refreshIndicatorExtent: 60.0,
             onRefresh: () async {
               await Future<void>.delayed(
                 const Duration(milliseconds: 1000),

examples/api/lib/gestures/pointer_signal_resolver/pointer_signal_resolver.0.dart

@@ -116,7 +116,6 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget> {
           Align(
             alignment: Alignment.topLeft,
             child: Row(
-              crossAxisAlignment: CrossAxisAlignment.center,
               children: <Widget>[
                 Switch(
                   value: useResolver,

examples/api/lib/material/date_picker/show_date_picker.0.dart

@@ -64,8 +64,8 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget>
           restorationId: 'date_picker_dialog',
           initialEntryMode: DatePickerEntryMode.calendarOnly,
           initialDate: DateTime.fromMillisecondsSinceEpoch(arguments! as int),
-          firstDate: DateTime(2021, 1, 1),
+          firstDate: DateTime(2021),
-          lastDate: DateTime(2022, 1, 1),
+          lastDate: DateTime(2022),
         );
       },
     );

examples/api/lib/material/date_picker/show_date_range_picker.0.dart

@@ -41,7 +41,7 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget>
   String? get restorationId => widget.restorationId;
 
   final RestorableDateTimeN _startDate =
-      RestorableDateTimeN(DateTime(2021, 1, 1));
+      RestorableDateTimeN(DateTime(2021));
   final RestorableDateTimeN _endDate =
       RestorableDateTimeN(DateTime(2021, 1, 5));
   late final RestorableRouteFuture<DateTimeRange?>
@@ -85,9 +85,9 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget>
           restorationId: 'date_picker_dialog',
           initialDateRange:
               _initialDateTimeRange(arguments! as Map<dynamic, dynamic>),
-          firstDate: DateTime(2021, 1, 1),
+          firstDate: DateTime(2021),
           currentDate: DateTime(2021, 1, 25),
-          lastDate: DateTime(2022, 1, 1),
+          lastDate: DateTime(2022),
         );
       },
     );

examples/api/lib/material/dropdown/dropdown_button.0.dart

@@ -42,7 +42,6 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget> {
     return DropdownButton<String>(
       value: dropdownValue,
       icon: const Icon(Icons.arrow_downward),
-      iconSize: 24,
       elevation: 16,
       style: const TextStyle(color: Colors.deepPurple),
       underline: Container(

examples/api/lib/material/list_tile/list_tile.5.dart

@@ -47,7 +47,6 @@ class _ArticleDescription extends StatelessWidget {
       crossAxisAlignment: CrossAxisAlignment.start,
       children: <Widget>[
         Expanded(
-          flex: 1,
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
             children: <Widget>[
@@ -73,7 +72,6 @@ class _ArticleDescription extends StatelessWidget {
           ),
         ),
         Expanded(
-          flex: 1,
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
             mainAxisAlignment: MainAxisAlignment.end,

examples/api/lib/material/material_state/material_state_border_side.0.dart

@@ -49,7 +49,7 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget> {
       },
       side: MaterialStateBorderSide.resolveWith((Set<MaterialState> states) {
         if (states.contains(MaterialState.selected)) {
-          return const BorderSide(width: 1, color: Colors.red);
+          return const BorderSide(color: Colors.red);
         }
         return null; // Defer to default value on the theme or widget.
       }),