Turn on avoid_dynamic_calls lint, except packages/flutter tests, make appropriate changes. (#84476)

This adds avoid_dynamic_calls to the list of lints, and fixes all instances where it was violated.

Importantly, this lint is NOT turned on for flutter/packages/test, because those changes are happening in another PR: #84478

analysis_options.yaml

@@ -61,7 +61,7 @@ linter:
     # - avoid_catching_errors # we do this commonly
     - avoid_classes_with_only_static_members
     # - avoid_double_and_int_checks # only useful when targeting JS runtime
-    # - avoid_dynamic_calls # not yet tested
+    - avoid_dynamic_calls
     - avoid_empty_else
     - avoid_equals_and_hash_code_on_mutable_classes
     - avoid_escaping_inner_quotes

dev/bots/prepare_package.dart

@@ -595,7 +595,7 @@ class ArchivePublisher {
     if (!jsonData.containsKey('current_release')) {
       jsonData['current_release'] = <String, String>{};
     }
-    jsonData['current_release'][branchName] = revision;
+    (jsonData['current_release'] as Map<String, dynamic>)[branchName] = revision;
     if (!jsonData.containsKey('releases')) {
       jsonData['releases'] = <Map<String, dynamic>>[];
     }

dev/bots/test.dart

@@ -1059,7 +1059,7 @@ Future<void> _ensureChromeDriverIsRunning() async {
   final HttpClientResponse response = await request.close();
   final Map<String, dynamic> webDriverStatus = json.decode(await response.transform(utf8.decoder).join('')) as Map<String, dynamic>;
   client.close();
-  final bool webDriverReady = webDriverStatus['value']['ready'] as bool;
+  final bool webDriverReady = (webDriverStatus['value'] as Map<String, dynamic>)['ready'] as bool;
   if (!webDriverReady) {
     throw Exception('WebDriver not available.');
   }

dev/bots/test/prepare_package_test.dart

@@ -394,7 +394,7 @@ void main() {
         // Make sure the new entry is first (and hopefully it takes less than a
         // minute to go from publishArchive above to this line!).
         expect(
-          DateTime.now().difference(DateTime.parse(releases[0]['release_date'] as String)),
+          DateTime.now().difference(DateTime.parse((releases[0] as Map<String, dynamic>)['release_date'] as String)),
           lessThan(const Duration(minutes: 1)),
         );
         const JsonEncoder encoder = JsonEncoder.withIndent('  ');

dev/bots/unpublish_package.dart

@@ -255,7 +255,7 @@ class ArchiveUnpublisher {
     });
     jsonData['releases'] = releases;
     for (final Channel channel in channels) {
-      if (!revisionsBeingRemoved.contains(jsonData['current_release'][getChannelName(channel)])) {
+      if (!revisionsBeingRemoved.contains((jsonData['current_release'] as Map<String, dynamic>)[getChannelName(channel)])) {
         // Don't replace the current release if it's not one of the revisions we're removing.
         continue;
       }
@@ -263,7 +263,7 @@ class ArchiveUnpublisher {
       if (replacementRelease == null) {
         throw UnpublishException('Unable to find previous release for channel ${getChannelName(channel)}.');
       }
-      jsonData['current_release'][getChannelName(channel)] = replacementRelease['hash'];
+      (jsonData['current_release'] as Map<String, dynamic>)[getChannelName(channel)] = replacementRelease['hash'];
       print(
         '${confirmed ? 'Reverting' : 'Would revert'} current ${getChannelName(channel)} '
         '${getPublishedPlatform(platform)} release to ${replacementRelease['hash']} (version ${replacementRelease['version']}).'

dev/devicelab/bin/tasks/flutter_gallery__transition_perf_with_semantics.dart

@@ -31,7 +31,7 @@ Future<void> main() async {
     final Map<String, dynamic> data = <String, dynamic>{};
     for (final String key in withSemantics.benchmarkScoreKeys) {
       final String deltaKey = 'delta_$key';
-      data[deltaKey] = withSemantics.data[key] - withoutSemantics.data[key];
+      data[deltaKey] = (withSemantics.data[key] as num) - (withoutSemantics.data[key] as num);
       data['semantics_$key'] = withSemantics.data[key];
       data[key] = withoutSemantics.data[key];
       benchmarkScoreKeys.add(deltaKey);

dev/devicelab/lib/framework/browser.dart

@@ -273,7 +273,7 @@ Future<Uri> _getRemoteDebuggerUrl(Uri base) async {
   if (jsonObject == null || jsonObject.isEmpty) {
     return base;
   }
-  return base.resolve(jsonObject.first['webSocketDebuggerUrl'] as String);
+  return base.resolve((jsonObject.first as Map<String, dynamic>)['webSocketDebuggerUrl'] as String);
 }
 
 /// Summarizes a Blink trace down to a few interesting values.

dev/devicelab/lib/framework/manifest.dart

@@ -104,11 +104,12 @@ Manifest _validateAndParseManifest(YamlMap manifestYaml) {
 
 List<ManifestTask> _validateAndParseTasks(dynamic tasksYaml) {
   _checkType(tasksYaml is YamlMap, tasksYaml, 'Value of "tasks"', 'dictionary');
-  final List<dynamic> sortedKeys = (tasksYaml as YamlMap).keys.toList()..sort();
-  return sortedKeys.map<ManifestTask>((dynamic taskName) => _validateAndParseTask(taskName, tasksYaml[taskName])).toList();
+  final List<String> sortedKeys = (tasksYaml as YamlMap).keys.toList().cast<String>()..sort();
+  // ignore: avoid_dynamic_calls
+  return sortedKeys.map<ManifestTask>((String taskName) => _validateAndParseTask(taskName, tasksYaml[taskName])).toList();
 }
 
-ManifestTask _validateAndParseTask(dynamic taskName, dynamic taskYaml) {
+ManifestTask _validateAndParseTask(String taskName, dynamic taskYaml) {
   _checkType(taskName is String, taskName, 'Task name', 'string');
   _checkType(taskYaml is YamlMap, taskYaml, 'Value of task "$taskName"', 'dictionary');
   _checkKeys(taskYaml as YamlMap, 'Value of task "$taskName"', const <String>[
@@ -119,27 +120,32 @@ ManifestTask _validateAndParseTask(dynamic taskName, dynamic taskYaml) {
     'timeout_in_minutes',
     'on_luci',
   ]);
-
+  // ignore: avoid_dynamic_calls
   final dynamic isFlaky = taskYaml['flaky'];
   if (isFlaky != null) {
     _checkType(isFlaky is bool, isFlaky, 'flaky', 'boolean');
   }
 
+  // ignore: avoid_dynamic_calls
   final dynamic timeoutInMinutes = taskYaml['timeout_in_minutes'];
   if (timeoutInMinutes != null) {
     _checkType(timeoutInMinutes is int, timeoutInMinutes, 'timeout_in_minutes', 'integer');
   }
 
-  final List<dynamic> capabilities = _validateAndParseCapabilities(taskName as String, taskYaml['required_agent_capabilities']);
+  // ignore: avoid_dynamic_calls
+  final List<dynamic> capabilities = _validateAndParseCapabilities(taskName, taskYaml['required_agent_capabilities']);
 
+  // ignore: avoid_dynamic_calls
   final dynamic onLuci = taskYaml['on_luci'];
   if (onLuci != null) {
     _checkType(onLuci is bool, onLuci, 'on_luci', 'boolean');
   }
 
   return ManifestTask._(
-    name: taskName as String,
+    name: taskName,
+    // ignore: avoid_dynamic_calls
     description: taskYaml['description'] as String,
+    // ignore: avoid_dynamic_calls
     stage: taskYaml['stage'] as String,
     requiredAgentCapabilities: capabilities as List<String>,
     isFlaky: isFlaky as bool ?? false,
@@ -150,8 +156,9 @@ ManifestTask _validateAndParseTask(dynamic taskName, dynamic taskYaml) {
 
 List<String> _validateAndParseCapabilities(String taskName, dynamic capabilitiesYaml) {
   _checkType(capabilitiesYaml is List, capabilitiesYaml, 'required_agent_capabilities', 'list');
-  for (int i = 0; i < (capabilitiesYaml as List<dynamic>).length; i++) {
-    final dynamic capability = capabilitiesYaml[i];
+  final List<dynamic> capabilities = capabilitiesYaml as List<dynamic>;
+  for (int i = 0; i < capabilities.length; i++) {
+    final dynamic capability = capabilities[i];
     _checkType(capability is String, capability, 'required_agent_capabilities[$i]', 'string');
   }
   return (capabilitiesYaml as List<dynamic>).cast<String>();

dev/devicelab/lib/framework/task_result.dart

@@ -31,7 +31,7 @@ class TaskResult {
               'result data ${prettyJson.convert(data)}';
         } else if (data[key] is! num) {
           throw 'Invalid benchmark score for key "$key". It is expected to be a num '
-              'but was ${data[key].runtimeType}: ${prettyJson.convert(data[key])}';
+              'but was ${(data[key] as Object).runtimeType}: ${prettyJson.convert(data[key])}';
         }
       }
     }

dev/devicelab/lib/tasks/hot_mode_tests.dart

@@ -151,24 +151,43 @@ TaskFunction createHotModeTest({String deviceIdOverride, Map<String, String> env
 
     return TaskResult.success(
       <String, dynamic> {
+        // ignore: avoid_dynamic_calls
         'hotReloadInitialDevFSSyncMilliseconds': smallReloadData['hotReloadInitialDevFSSyncMilliseconds'][0],
+        // ignore: avoid_dynamic_calls
         'hotRestartMillisecondsToFrame': smallReloadData['hotRestartMillisecondsToFrame'][0],
+        // ignore: avoid_dynamic_calls
         'hotReloadMillisecondsToFrame' : smallReloadData['hotReloadMillisecondsToFrame'][0],
+        // ignore: avoid_dynamic_calls
         'hotReloadDevFSSyncMilliseconds': smallReloadData['hotReloadDevFSSyncMilliseconds'][0],
+        // ignore: avoid_dynamic_calls
         'hotReloadFlutterReassembleMilliseconds': smallReloadData['hotReloadFlutterReassembleMilliseconds'][0],
+        // ignore: avoid_dynamic_calls
         'hotReloadVMReloadMilliseconds': smallReloadData['hotReloadVMReloadMilliseconds'][0],
+        // ignore: avoid_dynamic_calls
         'hotReloadMillisecondsToFrameAfterChange' : smallReloadData['hotReloadMillisecondsToFrame'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadDevFSSyncMillisecondsAfterChange': smallReloadData['hotReloadDevFSSyncMilliseconds'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadFlutterReassembleMillisecondsAfterChange': smallReloadData['hotReloadFlutterReassembleMilliseconds'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadVMReloadMillisecondsAfterChange': smallReloadData['hotReloadVMReloadMilliseconds'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadInitialDevFSSyncAfterRelaunchMilliseconds' : freshRestartReloadsData['hotReloadInitialDevFSSyncMilliseconds'][0],
+        // ignore: avoid_dynamic_calls
         'hotReloadMillisecondsToFrameAfterMediumChange' : mediumReloadData['hotReloadMillisecondsToFrame'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadDevFSSyncMillisecondsAfterMediumChange': mediumReloadData['hotReloadDevFSSyncMilliseconds'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadFlutterReassembleMillisecondsAfterMediumChange': mediumReloadData['hotReloadFlutterReassembleMilliseconds'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadVMReloadMillisecondsAfterMediumChange': mediumReloadData['hotReloadVMReloadMilliseconds'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadMillisecondsToFrameAfterLargeChange' : largeReloadData['hotReloadMillisecondsToFrame'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadDevFSSyncMillisecondsAfterLargeChange': largeReloadData['hotReloadDevFSSyncMilliseconds'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadFlutterReassembleMillisecondsAfterLargeChange': largeReloadData['hotReloadFlutterReassembleMilliseconds'][1],
+        // ignore: avoid_dynamic_calls
         'hotReloadVMReloadMillisecondsAfterLargeChange': largeReloadData['hotReloadVMReloadMilliseconds'][1],
       },
       benchmarkScoreKeys: <String>[

dev/devicelab/lib/tasks/perf_tests.dart

@@ -421,13 +421,15 @@ TaskFunction createsScrollSmoothnessPerfTest() {
       final Map<String, dynamic> result = <String, dynamic>{};
       void addResult(dynamic data, String suffix) {
         assert(data is Map<String, dynamic>);
+        if (data is Map<String, dynamic>) {
           const List<String> metricKeys = <String>[
             'janky_count',
             'average_abs_jerk',
             'dropped_frame_count',
           ];
           for (final String key in metricKeys) {
-          result[key+suffix] = data[key];
+            result[key + suffix] = data[key];
+          }
         }
       }
       addResult(data['resample on with 90Hz input'], '_with_resampler_90Hz');
@@ -1472,15 +1474,15 @@ class DevToolsMemoryTest {
       final Map<String, dynamic> data = json.decode(
         file('$project/$_kJsonFileName').readAsStringSync(),
       ) as Map<String, dynamic>;
-      final List<dynamic> samples = data['samples']['data'] as List<dynamic>;
+      final List<Map<String, dynamic>> samples = (data['samples'] as Map<String, dynamic>)['data'] as List<Map<String, dynamic>>;
       int maxRss = 0;
       int maxAdbTotal = 0;
-      for (final dynamic sample in samples) {
+      for (final Map<String, dynamic> sample in samples) {
         if (sample['rss'] != null) {
           maxRss = math.max(maxRss, sample['rss'] as int);
         }
         if (sample['adb_memoryInfo'] != null) {
-          maxAdbTotal = math.max(maxAdbTotal, sample['adb_memoryInfo']['Total'] as int);
+          maxAdbTotal = math.max(maxAdbTotal, (sample['adb_memoryInfo'] as Map<String, dynamic>)['Total'] as int);
         }
       }
 

dev/devicelab/lib/tasks/web_benchmarks.dart

@@ -69,7 +69,7 @@ Future<TaskResult> runWebBenchmark({ @required bool useCanvasKit }) async {
             final BlinkTraceSummary traceSummary = BlinkTraceSummary.fromJson(latestPerformanceTrace);
             profile['totalUiFrame.average'] = traceSummary.averageTotalUIFrameTime.inMicroseconds;
             profile['scoreKeys'] ??= <dynamic>[]; // using dynamic for consistency with JSON
-            profile['scoreKeys'].add('totalUiFrame.average');
+            (profile['scoreKeys'] as List<dynamic>).add('totalUiFrame.average');
             latestPerformanceTrace = null;
           }
           collectedProfiles.add(profile);

dev/integration_tests/flutter_gallery/lib/demo/transformations/transformations_demo_color_picker.dart

@@ -46,7 +46,7 @@ class _ColorPickerSwatch extends StatelessWidget {
 
   final Color color;
   final bool selected;
-  final Function? onTap;
+  final VoidCallback? onTap;
 
   @override
   Widget build (BuildContext context) {

dev/integration_tests/flutter_gallery/test_driver/transitions_perf_test.dart

@@ -42,7 +42,7 @@ Future<void> saveDurationsHistogram(List<Map<String, dynamic>> events, String ou
         frameStart = timestamp;
       } else {
         assert(phase == 'E');
-        final String routeName = startEvent['args']['to'] as String;
+        final String routeName = (startEvent['args'] as Map<String, dynamic>)['to'] as String;
         durations[routeName] ??= <int>[];
         durations[routeName]!.add(timestamp - frameStart!);
         startEvent = null;
@@ -79,7 +79,7 @@ Future<void> saveDurationsHistogram(List<Map<String, dynamic>> events, String ou
         continue;
 
       final String routeName = eventName == 'Start Transition'
-        ? eventIter.current['args']['to'] as String
+        ? (eventIter.current['args'] as Map<String, dynamic>)['to'] as String
         : '';
 
       if (eventName == lastEventName && routeName == lastRouteName) {

dev/tools/gen_keycodes/lib/logical_key_data.dart

@@ -440,18 +440,18 @@ class LogicalKeyEntry {
   LogicalKeyEntry.fromJsonMapEntry(Map<String, dynamic> map)
     : value = map['value'] as int,
       name = map['name'] as String,
-      webNames = _toNonEmptyArray<String>(map['names']['web']),
-      macOSKeyCodeNames = _toNonEmptyArray<String>(map['names']['macos']),
-      macOSKeyCodeValues = _toNonEmptyArray<int>(map['values']?['macos']),
-      iOSKeyCodeNames = _toNonEmptyArray<String>(map['names']['ios']),
-      iOSKeyCodeValues = _toNonEmptyArray<int>(map['values']?['ios']),
-      gtkNames = _toNonEmptyArray<String>(map['names']['gtk']),
-      gtkValues = _toNonEmptyArray<int>(map['values']?['gtk']),
-      windowsNames = _toNonEmptyArray<String>(map['names']['windows']),
-      windowsValues = _toNonEmptyArray<int>(map['values']?['windows']),
-      androidNames = _toNonEmptyArray<String>(map['names']['android']),
-      androidValues = _toNonEmptyArray<int>(map['values']?['android']),
-      fuchsiaValues = _toNonEmptyArray<int>(map['values']?['fuchsia']),
+      webNames = _toNonEmptyArray<String>((map['names'] as Map<String, dynamic>)['web']),
+      macOSKeyCodeNames = _toNonEmptyArray<String>((map['names'] as Map<String, dynamic>)['macos']),
+      macOSKeyCodeValues = _toNonEmptyArray<int>((map['values'] as Map<String, dynamic>?)?['macos']),
+      iOSKeyCodeNames = _toNonEmptyArray<String>((map['names'] as Map<String, dynamic>)['ios']),
+      iOSKeyCodeValues = _toNonEmptyArray<int>((map['values'] as Map<String, dynamic>?)?['ios']),
+      gtkNames = _toNonEmptyArray<String>((map['names'] as Map<String, dynamic>)['gtk']),
+      gtkValues = _toNonEmptyArray<int>((map['values'] as Map<String, dynamic>?)?['gtk']),
+      windowsNames = _toNonEmptyArray<String>((map['names'] as Map<String, dynamic>)['windows']),
+      windowsValues = _toNonEmptyArray<int>((map['values'] as Map<String, dynamic>?)?['windows']),
+      androidNames = _toNonEmptyArray<String>((map['names'] as Map<String, dynamic>)['android']),
+      androidValues = _toNonEmptyArray<int>((map['values'] as Map<String, dynamic>?)?['android']),
+      fuchsiaValues = _toNonEmptyArray<int>((map['values'] as Map<String, dynamic>?)?['fuchsia']),
       keyLabel = map['keyLabel'] as String?;
 
   final int value;

dev/tools/gen_keycodes/lib/physical_key_data.dart

@@ -275,17 +275,20 @@ class PhysicalKeyEntry {
 
   /// Populates the key from a JSON map.
   factory PhysicalKeyEntry.fromJsonMapEntry(Map<String, dynamic> map) {
+    final Map<String, dynamic> names = map['names'] as Map<String, dynamic>;
+    final Map<String, dynamic> scanCodes = map['scanCodes'] as Map<String, dynamic>;
+    final Map<String, dynamic>? keyCodes = map['keyCodes'] as Map<String, dynamic>?;
     return PhysicalKeyEntry(
-      name: map['names']['name'] as String,
-      chromiumCode: map['names']['chromium'] as String?,
-      usbHidCode: map['scanCodes']['usb'] as int,
-      androidScanCodes: (map['scanCodes']['android'] as List<dynamic>?)?.cast<int>() ?? <int>[],
-      linuxScanCode: map['scanCodes']['linux'] as int?,
-      xKbScanCode: map['scanCodes']['xkb'] as int?,
-      windowsScanCode: map['scanCodes']['windows'] as int?,
-      macOSScanCode: map['scanCodes']['macos'] as int?,
-      iOSScanCode: map['scanCodes']['ios'] as int?,
-      glfwKeyCodes: (map['keyCodes']?['glfw'] as List<dynamic>?)?.cast<int>() ?? <int>[],
+      name: names['name'] as String,
+      chromiumCode: names['chromium'] as String?,
+      usbHidCode: scanCodes['usb'] as int,
+      androidScanCodes: (scanCodes['android'] as List<dynamic>?)?.cast<int>() ?? <int>[],
+      linuxScanCode: scanCodes['linux'] as int?,
+      xKbScanCode: scanCodes['xkb'] as int?,
+      windowsScanCode: scanCodes['windows'] as int?,
+      macOSScanCode: scanCodes['macos'] as int?,
+      iOSScanCode: scanCodes['ios'] as int?,
+      glfwKeyCodes: (keyCodes?['glfw'] as List<dynamic>?)?.cast<int>() ?? <int>[],
     );
   }
 

packages/flutter/lib/src/animation/tween.dart

@@ -221,7 +221,7 @@ class _ChainedEvaluation<T> extends Animatable<T> {
 /// If `T` is not nullable, then [begin] and [end] must both be set to
 /// non-null values before using [lerp] or [transform], otherwise they
 /// will throw.
-class Tween<T extends dynamic> extends Animatable<T> {
+class Tween<T extends Object?> extends Animatable<T> {
   /// Creates a tween.
   ///
   /// The [begin] and [end] properties must be non-null before the tween is
@@ -261,7 +261,8 @@ class Tween<T extends dynamic> extends Animatable<T> {
       // that do not conform to the Tween requirements.
       dynamic result;
       try {
-        result = begin + (end - begin) * t;
+        // ignore: avoid_dynamic_calls
+        result = (begin as dynamic) + ((end as dynamic) - (begin as dynamic)) * t;
         result as T;
         return true;
       } on NoSuchMethodError {
@@ -301,7 +302,8 @@ class Tween<T extends dynamic> extends Animatable<T> {
         ]);
       }
     }());
-    return begin + (end - begin) * t as T;
+    // ignore: avoid_dynamic_calls
+    return (begin as dynamic) + ((end as dynamic) - (begin as dynamic)) * t as T;
   }
 
   /// Returns the interpolated value for the current value of the given animation.
@@ -330,7 +332,7 @@ class Tween<T extends dynamic> extends Animatable<T> {
 }
 
 /// A [Tween] that evaluates its [parent] in reverse.
-class ReverseTween<T> extends Tween<T> {
+class ReverseTween<T extends Object?> extends Tween<T> {
   /// Construct a [Tween] that evaluates its [parent] in reverse.
   ReverseTween(this.parent)
     : assert(parent != null),

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

@@ -35,6 +35,7 @@ Future<R> compute<Q, R>(isolates.ComputeCallback<Q, R> callback, Q message, { St
   final Completer<R> result = Completer<R>();
   errorPort.listen((dynamic errorData) {
     assert(errorData is List<dynamic>);
+    if (errorData is List<dynamic>) {
       assert(errorData.length == 2);
       final Exception exception = Exception(errorData[0]);
       final StackTrace stack = StackTrace.fromString(errorData[1] as String);
@@ -43,6 +44,7 @@ Future<R> compute<Q, R>(isolates.ComputeCallback<Q, R> callback, Q message, { St
       } else {
         result.completeError(exception, stack);
       }
+    }
   });
   exitPort.listen((dynamic exitData) {
     if (!result.isCompleted) {

packages/flutter/lib/src/painting/_network_image_web.dart

@@ -86,7 +86,7 @@ class NetworkImage
     final Uri resolved = Uri.base.resolve(key.url);
     // This API only exists in the web engine implementation and is not
     // contained in the analyzer summary for Flutter.
-    return ui.webOnlyInstantiateImageCodecFromUrl(// ignore: undefined_function
+    return ui.webOnlyInstantiateImageCodecFromUrl(// ignore: undefined_function, avoid_dynamic_calls
       resolved,
       chunkCallback: (int bytes, int total) {
         chunkEvents.add(ImageChunkEvent(cumulativeBytesLoaded: bytes, expectedTotalBytes: total));

packages/flutter/lib/src/painting/image_cache.dart

@@ -517,7 +517,7 @@ class ImageCache {
       image.dispose();
       _cache.remove(key);
       if (!kReleaseMode) {
-        finishArgs['evictedKeys'].add(key.toString());
+        (finishArgs['evictedKeys'] as List<String>).add(key.toString());
       }
     }
     if (!kReleaseMode) {

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

@@ -1369,8 +1369,10 @@ class TextInput {
         _currentConnection!._client.performAction(_toTextInputAction(args[1] as String));
         break;
       case 'TextInputClient.performPrivateCommand':
+        final Map<String, dynamic> firstArg = args[1] as Map<String, dynamic>;
         _currentConnection!._client.performPrivateCommand(
-          args[1]['action'] as String, args[1]['data'] as Map<String, dynamic>,
+          firstArg['action'] as String,
+          firstArg['data'] as Map<String, dynamic>,
         );
         break;
       case 'TextInputClient.updateFloatingCursor':

packages/flutter/lib/src/widgets/framework.dart

@@ -6395,7 +6395,7 @@ FlutterErrorDetails _debugReportException(
 ///  * [RenderObjectElement.updateChildren], which discusses why this class is
 ///    used as slot values for the children of a [MultiChildRenderObjectElement].
 @immutable
-class IndexedSlot<T> {
+class IndexedSlot<T extends Element?> {
   /// Creates an [IndexedSlot] with the provided [index] and slot [value].
   const IndexedSlot(this.index, this.value);
 

packages/flutter/lib/src/widgets/overscroll_indicator.dart

@@ -306,6 +306,9 @@ class _GlowingOverscrollIndicatorState extends State<GlowingOverscrollIndicator>
         }
       }
     } else if (notification is ScrollEndNotification || notification is ScrollUpdateNotification) {
+      // Using dynamic here to avoid layer violations of importing
+      // drag_details.dart from gestures.
+      // ignore: avoid_dynamic_calls
       if ((notification as dynamic).dragDetails != null) {
         _leadingController!.scrollEnd();
         _trailingController!.scrollEnd();

packages/flutter/test/analysis_options.yaml

+include: ../analysis_options.yaml
+
+linter:
+  rules:
+    # Turn off for tests, since we often use dynamic as a method to obtain a
+    # reference to a private state object or renderer in tests.
+    avoid_dynamic_calls: false

packages/flutter/test/services/fake_platform_views.dart

@@ -209,7 +209,9 @@ class FakeAndroidPlatformViewsController {
   Future<dynamic> _dispose(MethodCall call) {
     assert(call.arguments is Map);
 
+    // ignore: avoid_dynamic_calls
     final int id = call.arguments['id'] as int;
+    // ignore: avoid_dynamic_calls
     final bool hybrid = call.arguments['hybrid'] as bool;
 
     if (hybrid && !_views[id]!.hybrid!) {

packages/flutter_driver/lib/src/driver/web_driver.dart

@@ -156,12 +156,12 @@ class WebFlutterDriver extends FlutterDriver {
     final List<Map<String, dynamic>> events = <Map<String, dynamic>>[];
     for (final async_io.LogEntry entry in await _connection.logs.toList()) {
       if (_startTime.isBefore(entry.timestamp)) {
-        final Map<String, dynamic> data = jsonDecode(entry.message!)['message'] as Map<String, dynamic>;
+        final Map<String, dynamic> data = (jsonDecode(entry.message!) as Map<String, dynamic>)['message'] as Map<String, dynamic>;
         if (data['method'] == 'Tracing.dataCollected') {
           // 'ts' data collected from Chrome is in double format, conversion needed
           try {
-            data['params']['ts'] =
-                double.parse(data['params']['ts'].toString()).toInt();
+            final Map<String, dynamic> params = data['params'] as Map<String, dynamic>;
+            params['ts'] = double.parse(params['ts'].toString()).toInt();
           } on FormatException catch (_) {
             // data is corrupted, skip
             continue;

packages/flutter_driver/test/src/real_tests/flutter_driver_test.dart

@@ -968,16 +968,16 @@ void main() {
   });
 }
 
-/// This function will verify the format of the script
-/// and return the actual script.
-/// script will be in the following format:
+// This function will verify the format of the script and return the actual
+// script. The script will be in the following format:
 //   window.flutterDriver('[actual script]')
-String? _checkAndEncode(dynamic script) {
+String _checkAndEncode(dynamic script) {
   expect(script, isA<String>());
-  expect(script.startsWith(_kWebScriptPrefix), isTrue);
-  expect(script.endsWith(_kWebScriptSuffix), isTrue);
+  final String scriptString = script as String;
+  expect(scriptString.startsWith(_kWebScriptPrefix), isTrue);
+  expect(scriptString.endsWith(_kWebScriptSuffix), isTrue);
   // Strip prefix and suffix
-  return script.substring(_kWebScriptPrefix.length, script.length - 2) as String?;
+  return scriptString.substring(_kWebScriptPrefix.length, script.length - 2);
 }
 
 vms.Response? makeFakeResponse(
@@ -999,7 +999,7 @@ class FakeFlutterWebConnection extends Fake implements FlutterWebConnection {
   @override
   Future<dynamic> sendCommand(String script, Duration? duration) async {
     commandLog.add('$script $duration');
-    final Map<String, dynamic> decoded = jsonDecode(_checkAndEncode(script)!) as Map<String, dynamic>;
+    final Map<String, dynamic> decoded = jsonDecode(_checkAndEncode(script)) as Map<String, dynamic>;
     final dynamic response = responses[decoded['command']];
     assert(response != null, 'Missing ${decoded['command']} in responses.');
     return response;

packages/flutter_localizations/test/material/time_picker_test.dart

@@ -345,14 +345,18 @@ void main() {
 
     final CustomPaint dialPaint = tester.widget(find.byKey(const ValueKey<String>('time-picker-dial')));
     final dynamic dialPainter = dialPaint.painter;
+    // ignore: avoid_dynamic_calls
     final List<dynamic> primaryLabels = dialPainter.primaryLabels as List<dynamic>;
     expect(
+      // ignore: avoid_dynamic_calls
       primaryLabels.map<String>((dynamic tp) => ((tp.painter as TextPainter).text! as TextSpan).text!),
       labels12To11,
     );
 
+    // ignore: avoid_dynamic_calls
     final List<dynamic> secondaryLabels = dialPainter.secondaryLabels as List<dynamic>;
     expect(
+      // ignore: avoid_dynamic_calls
       secondaryLabels.map<String>((dynamic tp) => ((tp.painter as TextPainter).text! as TextSpan).text!),
       labels12To11,
     );
@@ -363,14 +367,18 @@ void main() {
 
     final CustomPaint dialPaint = tester.widget(find.byKey(const ValueKey<String>('time-picker-dial')));
     final dynamic dialPainter = dialPaint.painter;
+    // ignore: avoid_dynamic_calls
     final List<dynamic> primaryLabels = dialPainter.primaryLabels as List<dynamic>;
     expect(
+      // ignore: avoid_dynamic_calls
       primaryLabels.map<String>((dynamic tp) => ((tp.painter as TextPainter).text! as TextSpan).text!),
       labels00To22TwoDigit,
     );
 
+    // ignore: avoid_dynamic_calls
     final List<dynamic> secondaryLabels = dialPainter.secondaryLabels as List<dynamic>;
     expect(
+      // ignore: avoid_dynamic_calls
       secondaryLabels.map<String>((dynamic tp) => ((tp.painter as TextPainter).text! as TextSpan).text!),
       labels00To22TwoDigit,
     );

packages/flutter_test/lib/src/matchers.dart

@@ -866,7 +866,7 @@ class _HasGoodToStringDeep extends Matcher {
   @override
   bool matches(dynamic object, Map<dynamic, dynamic> matchState) {
     final List<String> issues = <String>[];
-    String description = object.toStringDeep() as String;
+    String description = object.toStringDeep() as String; // ignore: avoid_dynamic_calls
     if (description.endsWith('\n')) {
       // Trim off trailing \n as the remaining calculations assume
       // the description does not end with a trailing \n.
@@ -904,7 +904,7 @@ class _HasGoodToStringDeep extends Matcher {
     const String prefixOtherLines = 'PREFIX_OTHER_LINES_';
     final List<String> prefixIssues = <String>[];
     String descriptionWithPrefixes =
-      object.toStringDeep(prefixLineOne: prefixLineOne, prefixOtherLines: prefixOtherLines) as String;
+      object.toStringDeep(prefixLineOne: prefixLineOne, prefixOtherLines: prefixOtherLines) as String; // ignore: avoid_dynamic_calls
     if (descriptionWithPrefixes.endsWith('\n')) {
       // Trim off trailing \n as the remaining calculations assume
       // the description does not end with a trailing \n.
@@ -1875,7 +1875,7 @@ class _MatchesSemanticsData extends Matcher {
     bool allMatched = true;
     if (children != null) {
       int i = 0;
-      node.visitChildren((SemanticsNode child) {
+      (node as SemanticsNode).visitChildren((SemanticsNode child) {
         allMatched = children![i].matches(child, matchState) && allMatched;
         i += 1;
         return allMatched;

packages/flutter_test/lib/src/test_text_input.dart

@@ -119,8 +119,9 @@ class TestTextInput {
     log.add(methodCall);
     switch (methodCall.method) {
       case 'TextInput.setClient':
-        _client = methodCall.arguments[0] as int;
-        setClientArgs = methodCall.arguments[1] as Map<String, dynamic>;
+        final List<dynamic> arguments = methodCall.arguments as List<dynamic>;
+        _client = arguments[0] as int;
+        setClientArgs = arguments[1] as Map<String, dynamic>;
         break;
       case 'TextInput.updateConfig':
         setClientArgs = methodCall.arguments as Map<String, dynamic>;

packages/flutter_test/test/window_test.dart

@@ -11,6 +11,7 @@ import 'package:flutter_test/flutter_test.dart';
 void main() {
   test('TestWindow can handle new methods without breaking', () {
     final dynamic testWindow = TestWindow(window: ui.window);
+    // ignore: avoid_dynamic_calls
     expect(testWindow.someNewProperty, null);
   });
 

packages/flutter_tools/lib/src/base/multi_root_file_system.dart

@@ -126,7 +126,7 @@ class MultiRootFileSystem extends ForwardingFileSystem {
     } else if (path is FileSystemEntity) {
       uri = path.uri;
     } else {
-      throw ArgumentError('Invalid type for "path": ${path?.runtimeType}');
+      throw ArgumentError('Invalid type for "path": ${(path as Object?)?.runtimeType}');
     }
 
     if (!uri.hasScheme || uri.scheme != _scheme) {

packages/flutter_tools/lib/src/build_system/targets/web.dart

@@ -15,6 +15,7 @@ import '../../base/file_system.dart';
 import '../../base/io.dart';
 import '../../build_info.dart';
 import '../../cache.dart';
+import '../../convert.dart';
 import '../../dart/language_version.dart';
 import '../../dart/package_map.dart';
 import '../../globals_null_migrated.dart' as globals;
@@ -198,6 +199,16 @@ class Dart2JSTarget extends Target {
     'dart2js.d',
   ];
 
+  String _collectOutput(ProcessResult result) {
+    final String stdout = result.stdout is List<int>
+        ? utf8.decode(result.stdout as List<int>)
+        : result.stdout as String;
+    final String stderr = result.stderr is List<int>
+        ? utf8.decode(result.stderr as List<int>)
+        : result.stderr as String;
+    return stdout + stderr;
+  }
+
   @override
   Future<void> build(Environment environment) async {
     final BuildMode buildMode = getBuildModeForName(environment.defines[kBuildMode]);
@@ -233,7 +244,7 @@ class Dart2JSTarget extends Target {
       environment.buildDir.childFile('main.dart').path, // dartfile
     ]);
     if (kernelResult.exitCode != 0) {
-      throw Exception(kernelResult.stdout + kernelResult.stderr);
+      throw Exception(_collectOutput(kernelResult));
     }
 
     final String dart2jsOptimization = environment.defines[kDart2jsOptimization];
@@ -250,7 +261,7 @@ class Dart2JSTarget extends Target {
       environment.buildDir.childFile('app.dill').path, // dartfile
     ]);
     if (javaScriptResult.exitCode != 0) {
-      throw Exception(javaScriptResult.stdout + javaScriptResult.stderr);
+      throw Exception(_collectOutput(javaScriptResult));
     }
     final File dart2jsDeps = environment.buildDir
       .childFile('app.dill.deps');

packages/flutter_tools/lib/src/dart/analysis.dart

@@ -150,7 +150,7 @@ class AnalysisServer {
   void _handleStatus(Map<String, dynamic> statusInfo) {
     // {"event":"server.status","params":{"analysis":{"isAnalyzing":true}}}
     if (statusInfo['analysis'] != null && !_analyzingController.isClosed) {
-      final bool isAnalyzing = statusInfo['analysis']['isAnalyzing'] as bool;
+      final bool isAnalyzing = (statusInfo['analysis'] as Map<String, dynamic>)['isAnalyzing'] as bool;
       _analyzingController.add(isAnalyzing);
     }
   }
@@ -293,15 +293,16 @@ class WrittenError {
   ///      "hasFix":false
   ///  }
   static WrittenError fromJson(Map<String, dynamic> json) {
+    final Map<String, dynamic> location = json['location'] as Map<String, dynamic>;
     return WrittenError._(
       severity: json['severity'] as String,
       type: json['type'] as String,
       message: json['message'] as String,
       code: json['code'] as String,
-      file: json['location']['file'] as String,
-      startLine: json['location']['startLine'] as int,
-      startColumn: json['location']['startColumn'] as int,
-      offset: json['location']['offset'] as int,
+      file: location['file'] as String,
+      startLine: location['startLine'] as int,
+      startColumn: location['startColumn'] as int,
+      offset: location['offset'] as int,
     );
   }
 

packages/flutter_tools/lib/src/dart/pub.dart

@@ -496,10 +496,10 @@ class _DefaultPub implements Pub {
 
     // Because [loadPackageConfigWithLogging] succeeded [packageConfigFile]
     // we can rely on the file to exist and be correctly formatted.
-    final dynamic jsonContents =
-        json.decode(packageConfigFile.readAsStringSync());
+    final Map<String, dynamic> jsonContents =
+        json.decode(packageConfigFile.readAsStringSync()) as Map<String, dynamic>;
 
-    jsonContents['packages'].add(<String, dynamic>{
+    (jsonContents['packages'] as List<dynamic>).add(<String, dynamic>{
       'name': 'flutter_gen',
       'rootUri': 'flutter_gen',
       'languageVersion': '2.12',

packages/flutter_tools/lib/src/flutter_manifest.dart

@@ -247,7 +247,7 @@ class FlutterManifest {
         DeferredComponent(
           name: component['name'] as String,
           libraries: component['libraries'] == null ?
-              <String>[] : component['libraries'].cast<String>() as List<String>,
+              <String>[] : (component['libraries'] as List<dynamic>).cast<String>(),
           assets: assetsUri,
         )
       );
@@ -571,6 +571,7 @@ void _validateFlutter(YamlMap? yaml, List<String> errors) {
 void _validateListType<T>(YamlList yamlList, List<String> errors, String context, String typeAlias) {
   for (int i = 0; i < yamlList.length; i++) {
     if (yamlList[i] is! T) {
+      // ignore: avoid_dynamic_calls
       errors.add('Expected $context to be a list of $typeAlias, but element $i was a ${yamlList[i].runtimeType}');
     }
   }
@@ -584,6 +585,7 @@ void _validateDeferredComponents(MapEntry<Object?, Object?> kvp, List<String> er
     for (int i = 0; i < yamlList.length; i++) {
       final Object? valueMap = yamlList[i];
       if (valueMap is! YamlMap) {
+        // ignore: avoid_dynamic_calls
         errors.add('Expected the $i element in "${kvp.key}" to be a map, but got ${yamlList[i]} (${yamlList[i].runtimeType}).');
         continue;
       }

packages/flutter_tools/lib/src/ios/simulators.dart

@@ -130,7 +130,7 @@ class SimControl {
       return <String, Map<String, dynamic>>{};
     }
     try {
-      final Object decodeResult = json.decode(results.stdout)[section.name];
+      final Object decodeResult = (json.decode(results.stdout) as Map<String, dynamic>)[section.name];
       if (decodeResult is Map<String, dynamic>) {
         return decodeResult;
       }

packages/flutter_tools/lib/src/macos/xcdevice.dart

@@ -269,17 +269,13 @@ class XCDevice {
 
     final List<IOSDevice> devices = <IOSDevice>[];
     for (final dynamic device in allAvailableDevices) {
-      if (device is! Map) {
-        continue;
-      }
-      final Map<String, dynamic> deviceProperties = device as Map<String, dynamic>;
-
+      if (device is Map<String, dynamic>) {
         // Only include iPhone, iPad, iPod, or other iOS devices.
-      if (!_isIPhoneOSDevice(deviceProperties)) {
+        if (!_isIPhoneOSDevice(device)) {
           continue;
         }
 
-      final Map<String, dynamic> errorProperties = _errorProperties(deviceProperties);
+        final Map<String, dynamic> errorProperties = _errorProperties(device);
         if (errorProperties != null) {
           final String errorMessage = _parseErrorMessage(errorProperties);
           if (errorMessage.contains('not paired')) {
@@ -297,7 +293,7 @@ class XCDevice {
           }
         }
 
-      final IOSDeviceInterface interface = _interfaceType(deviceProperties);
+        final IOSDeviceInterface interface = _interfaceType(device);
 
         // Only support USB devices, skip "network" interface (Xcode > Window > Devices and Simulators > Connect via network).
         // TODO(jmagman): Remove this check once wirelessly detected devices can be observed and attached, https://github.com/flutter/flutter/issues/15072.
@@ -308,9 +304,9 @@ class XCDevice {
         devices.add(IOSDevice(
           device['identifier'] as String,
           name: device['name'] as String,
-        cpuArchitecture: _cpuArchitecture(deviceProperties),
+          cpuArchitecture: _cpuArchitecture(device),
           interfaceType: interface,
-        sdkVersion: _sdkVersion(deviceProperties),
+          sdkVersion: _sdkVersion(device),
           iProxy: _iProxy,
           fileSystem: globals.fs,
           logger: _logger,
@@ -319,6 +315,7 @@ class XCDevice {
           platform: globals.platform,
         ));
       }
+    }
     return devices;
   }
 

packages/flutter_tools/lib/src/plugins.dart

@@ -89,13 +89,12 @@ class Plugin {
   factory Plugin._fromMultiPlatformYaml(
     String name,
     String path,
-    dynamic pluginYaml,
+    YamlMap pluginYaml,
     List<String> dependencies,
     FileSystem fileSystem,
     bool isDirectDependency,
   ) {
-    assert (pluginYaml != null && pluginYaml['platforms'] != null,
-            'Invalid multi-platform plugin specification $name.');
+    assert (pluginYaml['platforms'] != null, 'Invalid multi-platform plugin specification $name.');
     final YamlMap platformsYaml = pluginYaml['platforms'] as YamlMap;
 
     assert (_validateMultiPlatformYaml(platformsYaml).isEmpty,
@@ -190,7 +189,7 @@ class Plugin {
     bool isDirectDependency,
   ) {
     final Map<String, PluginPlatform> platforms = <String, PluginPlatform>{};
-    final String pluginClass = pluginYaml['pluginClass'] as String;
+    final String pluginClass = (pluginYaml as Map<dynamic, dynamic>)['pluginClass'] as String;
     if (pluginYaml != null && pluginClass != null) {
       final String androidPackage = pluginYaml['androidPackage'] as String;
       if (androidPackage != null) {

packages/flutter_tools/lib/src/protocol_discovery.dart

@@ -177,8 +177,8 @@ class _BufferedStreamController<T> {
           _streamControllerInstance.add(event);
         } else {
           _streamControllerInstance.addError(
-            event.first as Object,
-            event.last as StackTrace,
+            (event as Iterable<dynamic>).first as Object,
+            (event as Iterable<dynamic>).last as StackTrace,
           );
         }
       }

packages/flutter_tools/lib/src/run_hot.dart

@@ -1118,8 +1118,9 @@ Future<OperationResult> _defaultReloadSourcesHelper(
   // refactored, we'll probably need to send one hot reload/restart event
   // per device to analytics.
   firstReloadDetails.addAll(castStringKeyedMap(reloadReport.json['details']));
-  final int loadedLibraryCount = reloadReport.json['details']['loadedLibraryCount'] as int;
-  final int finalLibraryCount = reloadReport.json['details']['finalLibraryCount'] as int;
+  final Map<String, dynamic> details = reloadReport.json['details'] as Map<String, dynamic>;
+  final int loadedLibraryCount = details['loadedLibraryCount'] as int;
+  final int finalLibraryCount = details['finalLibraryCount'] as int;
   globals.printTrace('reloaded $loadedLibraryCount of $finalLibraryCount libraries');
   // reloadMessage = 'Reloaded $loadedLibraryCount of $finalLibraryCount libraries';
   // Record time it took for the VM to reload the sources.

packages/flutter_tools/lib/src/test/flutter_web_platform.dart

@@ -737,6 +737,8 @@ class BrowserManager {
 
   /// The callback for handling messages received from the host page.
   void _onMessage(dynamic message) {
+    assert(message is Map<String, dynamic>);
+    if (message is Map<String, dynamic>) {
       switch (message['command'] as String) {
         case 'ping':
           break;
@@ -754,6 +756,7 @@ class BrowserManager {
           break;
       }
     }
+  }
 
   /// Closes the manager and releases any resources it owns, including closing
   /// the browser.

packages/flutter_tools/lib/src/windows/visual_studio.dart

@@ -56,7 +56,7 @@ class VisualStudio {
     if (_bestVisualStudioDetails[_catalogKey] == null) {
       return null;
     }
-    return _bestVisualStudioDetails[_catalogKey][_catalogDisplayVersionKey] as String?;
+    return (_bestVisualStudioDetails[_catalogKey] as Map<String, dynamic>)[_catalogDisplayVersionKey] as String?;
   }
 
   /// The directory where Visual Studio is installed.

packages/flutter_tools/test/commands.shard/hermetic/config_test.dart

@@ -52,13 +52,14 @@ void main() {
 
       expect(testLogger.statusText, isNotEmpty);
       final dynamic jsonObject = json.decode(testLogger.statusText);
-      expect(jsonObject, isMap);
-
+      expect(jsonObject, const TypeMatcher<Map<String, dynamic>>());
+      if (jsonObject is Map<String, dynamic>) {
         expect(jsonObject.containsKey('android-studio-dir'), true);
         expect(jsonObject['android-studio-dir'], isNotNull);
 
         expect(jsonObject.containsKey('android-sdk'), true);
         expect(jsonObject['android-sdk'], isNotNull);
+      }
       verifyNoAnalytics();
     }, overrides: <Type, Generator>{
       AndroidStudio: () => fakeAndroidStudio,

packages/flutter_tools/test/commands.shard/hermetic/daemon_test.dart

@@ -93,7 +93,7 @@ void main() {
 
       expect(response['id'], 0);
       expect(response['result'], isNotEmpty);
-      expect(response['result']['platforms'], <String>{'macos'});
+      expect((response['result'] as Map<String, dynamic>)['platforms'], <String>{'macos'});
       await responses.close();
       await commands.close();
     }, overrides: <Type, Generator>{
@@ -111,7 +111,7 @@ void main() {
       );
       globals.printError('daemon.logMessage test');
       final Map<String, dynamic> response = await responses.stream.firstWhere((Map<String, dynamic> map) {
-        return map['event'] == 'daemon.logMessage' && map['params']['level'] == 'error';
+        return map['event'] == 'daemon.logMessage' && (map['params'] as Map<String, dynamic>)['level'] == 'error';
       });
       expect(response['id'], isNull);
       expect(response['event'], 'daemon.logMessage');
@@ -347,7 +347,7 @@ void main() {
       unawaited(output.stream
         .firstWhere((Map<String, dynamic> request) => request['method'] == 'app.exposeUrl')
         .then((Map<String, dynamic> request) {
-          expect(request['params']['url'], equals(originalUrl));
+          expect((request['params'] as Map<String, dynamic>)['url'], equals(originalUrl));
           input.add(<String, dynamic>{'id': request['id'], 'result': <String, dynamic>{'url': mappedUrl}});
         })
       );
@@ -370,9 +370,10 @@ void main() {
 
       commands.add(<String, dynamic>{'id': 0, 'method': 'devtools.serve'});
       final Map<String, dynamic> response = await responses.stream.firstWhere((Map<String, dynamic> response) => response['id'] == 0);
-      expect(response['result'], isNotEmpty);
-      expect(response['result']['host'], '127.0.0.1');
-      expect(response['result']['port'], 1234);
+      final Map<String, dynamic> result = response['result'] as Map<String, dynamic>;
+      expect(result, isNotEmpty);
+      expect(result['host'], '127.0.0.1');
+      expect(result['port'], 1234);
       await responses.close();
       await commands.close();
     }, overrides: <Type, Generator>{
@@ -390,9 +391,10 @@ void main() {
 
       commands.add(<String, dynamic>{'id': 0, 'method': 'devtools.serve'});
       final Map<String, dynamic> response = await responses.stream.firstWhere((Map<String, dynamic> response) => response['id'] == 0);
-      expect(response['result'], isNotEmpty);
-      expect(response['result']['host'], null);
-      expect(response['result']['port'], null);
+      final Map<String, dynamic> result = response['result'] as Map<String, dynamic>;
+      expect(result, isNotEmpty);
+      expect(result['host'], null);
+      expect(result['port'], null);
       await responses.close();
       await commands.close();
     }, overrides: <Type, Generator>{

packages/flutter_tools/test/commands.shard/permeable/create_test.dart

@@ -28,6 +28,7 @@ import 'package:process/process.dart';
 import 'package:pub_semver/pub_semver.dart';
 import 'package:pubspec_parse/pubspec_parse.dart';
 import 'package:uuid/uuid.dart';
+import 'package:yaml/yaml.dart';
 
 import '../../src/common.dart';
 import '../../src/context.dart';
@@ -482,8 +483,9 @@ void main() {
     // Expect the dependency on flutter_web_plugins exists
     expect(pubspec.dependencies, contains('flutter_web_plugins'));
     // The platform is correctly registered
-    expect(pubspec.flutter['plugin']['platforms']['web']['pluginClass'], 'FlutterProjectWeb');
-    expect(pubspec.flutter['plugin']['platforms']['web']['fileName'], 'flutter_project_web.dart');
+    final YamlMap web = ((pubspec.flutter['plugin'] as YamlMap)['platforms'] as YamlMap)['web'] as YamlMap;
+    expect(web['pluginClass'], 'FlutterProjectWeb');
+    expect(web['fileName'], 'flutter_project_web.dart');
     expect(logger.errorText, isNot(contains(_kNoPlatformsMessage)));
   }, overrides: <Type, Generator>{
     FeatureFlags: () => TestFeatureFlags(isWebEnabled: true),

packages/flutter_tools/test/general.shard/base/analyze_size_test.dart

@@ -90,47 +90,54 @@ void main() {
     );
 
     expect(result['type'], 'apk');
-
-    final Map<String, dynamic> androidManifestMap = result['children'][0] as Map<String, dynamic>;
+    final List<dynamic> resultChildren = result['children'] as List<dynamic>;
+    final Map<String, dynamic> androidManifestMap = resultChildren[0] as Map<String, dynamic>;
     expect(androidManifestMap['n'], 'AndroidManifest.xml');
     expect(androidManifestMap['value'], 6);
 
-    final Map<String, dynamic> metaInfMap = result['children'][1] as Map<String, dynamic>;
+    final Map<String, Object?> metaInfMap = resultChildren[1] as Map<String, Object?>;
+    final List<Map<String, Object?>> metaInfMapChildren = metaInfMap['children']! as List<Map<String, Object?>>;
     expect(metaInfMap['n'], 'META-INF');
     expect(metaInfMap['value'], 10);
-    final Map<String, dynamic> certRsaMap = metaInfMap['children'][0] as Map<String, dynamic>;
+    final Map<String, dynamic> certRsaMap = metaInfMapChildren[0];
     expect(certRsaMap['n'], 'CERT.RSA');
     expect(certRsaMap['value'], 5);
-    final Map<String, dynamic> certSfMap = metaInfMap['children'][1] as Map<String, dynamic>;
+    final Map<String, dynamic> certSfMap = metaInfMapChildren[1];
     expect(certSfMap['n'], 'CERT.SF');
     expect(certSfMap['value'], 5);
 
-    final Map<String, dynamic> libMap = result['children'][2] as Map<String, dynamic>;
+    final Map<String, Object?> libMap = resultChildren[2] as Map<String, Object?>;
+    final List<Map<String, Object?>> libMapChildren = libMap['children']! as List<Map<String, Object?>>;
     expect(libMap['n'], 'lib');
     expect(libMap['value'], 12);
-    final Map<String, dynamic> arm64Map = libMap['children'][0] as Map<String, dynamic>;
+    final Map<String, Object?> arm64Map = libMapChildren[0];
+    final List<Map<String, Object?>> arn64MapChildren = arm64Map['children']! as List<Map<String, Object?>>;
     expect(arm64Map['n'], 'arm64-v8a');
     expect(arm64Map['value'], 12);
-    final Map<String, dynamic> libAppMap = arm64Map['children'][0] as Map<String, dynamic>;
+    final Map<String, Object?> libAppMap = arn64MapChildren[0];
+    final List<dynamic> libAppMapChildren = libAppMap['children']! as List<dynamic>;
     expect(libAppMap['n'], 'libxyzzyapp.so (Dart AOT)');
     expect(libAppMap['value'], 6);
-    expect(libAppMap['children'].length, 3);
-    final Map<String, dynamic> internalMap = libAppMap['children'][0] as Map<String, dynamic>;
-    final Map<String, dynamic> skipMap = internalMap['children'][0] as Map<String, dynamic>;
+    expect(libAppMapChildren.length, 3);
+    final Map<String, Object?> internalMap = libAppMapChildren[0] as Map<String, Object?>;
+    final List<dynamic> internalMapChildren = internalMap['children']! as List<dynamic>;
+    final Map<String, Object?> skipMap = internalMapChildren[0] as Map<String, Object?>;
     expect(skipMap['n'], 'skip');
     expect(skipMap['value'], 2400);
-    final Map<String, dynamic> subListIterableMap = internalMap['children'][1] as Map<String, dynamic>;
+    final Map<String, Object?> subListIterableMap = internalMapChildren[1] as Map<String, Object?>;
     expect(subListIterableMap['n'], 'new SubListIterable.');
     expect(subListIterableMap['value'], 3560);
-    final Map<String, dynamic> coreMap = libAppMap['children'][1] as Map<String, dynamic>;
-    final Map<String, dynamic> rangeErrorMap = coreMap['children'][0] as Map<String, dynamic>;
+    final Map<String, Object?> coreMap = libAppMapChildren[1] as Map<String, Object?>;
+    final List<dynamic> coreMapChildren = coreMap['children']! as List<dynamic>;
+    final Map<String, Object?> rangeErrorMap = coreMapChildren[0] as Map<String, Object?>;
     expect(rangeErrorMap['n'], 'new RangeError.range');
     expect(rangeErrorMap['value'], 3920);
-    final Map<String, dynamic> stubsMap = libAppMap['children'][2] as Map<String, dynamic>;
-    final Map<String, dynamic> allocateMap = stubsMap['children'][0] as Map<String, dynamic>;
+    final Map<String, Object?> stubsMap = libAppMapChildren[2] as Map<String, Object?>;
+    final List<dynamic> stubsMapChildren = stubsMap['children']! as List<dynamic>;
+    final Map<String, Object?> allocateMap = stubsMapChildren[0] as Map<String, Object?>;
     expect(allocateMap['n'], 'Allocate ArgumentError');
     expect(allocateMap['value'], 4650);
-    final Map<String, dynamic> libFlutterMap = arm64Map['children'][1] as Map<String, dynamic>;
+    final Map<String, Object?> libFlutterMap = arn64MapChildren[1];
     expect(libFlutterMap['n'], 'libflutter.so (Flutter Engine)');
     expect(libFlutterMap['value'], 6);
 

packages/flutter_tools/test/general.shard/base/fingerprint_test.dart

@@ -104,9 +104,10 @@ void main() {
         final Fingerprint fingerprint = Fingerprint.fromBuildInputs(const <String>['a.dart', 'b.dart'], fileSystem);
 
         final Map<String, dynamic>? jsonObject = castStringKeyedMap(json.decode(fingerprint.toJson()));
-        expect(jsonObject!['files'], hasLength(2));
-        expect(jsonObject['files']['a.dart'], '8a21a15fad560b799f6731d436c1b698');
-        expect(jsonObject['files']['b.dart'], '6f144e08b58cd0925328610fad7ac07c');
+        final Map<String, dynamic> files = jsonObject!['files'] as Map<String, dynamic>;
+        expect(files, hasLength(2));
+        expect(files['a.dart'], '8a21a15fad560b799f6731d436c1b698');
+        expect(files['b.dart'], '6f144e08b58cd0925328610fad7ac07c');
       });
     });
 
@@ -124,10 +125,11 @@ void main() {
         });
         final Fingerprint fingerprint = Fingerprint.fromJson(jsonString);
         final Map<String, dynamic>? content = castStringKeyedMap(json.decode(fingerprint.toJson()));
+        final Map<String, dynamic> files = content!['files'] as Map<String, dynamic>;
         expect(content, hasLength(1));
-        expect(content!['files'], hasLength(2));
-        expect(content['files']['a.dart'], '8a21a15fad560b799f6731d436c1b698');
-        expect(content['files']['b.dart'], '6f144e08b58cd0925328610fad7ac07c');
+        expect(files, hasLength(2));
+        expect(files['a.dart'], '8a21a15fad560b799f6731d436c1b698');
+        expect(files['b.dart'], '6f144e08b58cd0925328610fad7ac07c');
       });
       testWithoutContext('treats missing properties and files entries as if empty', () {
         final String jsonString = json.encode(<String, dynamic>{});

packages/flutter_tools/test/general.shard/project_test.dart

@@ -284,7 +284,7 @@ void main() {
     version: 1.0.0+3
     ''', logger: BufferLogger.test());
         final FlutterProject project = FlutterProject(fileSystem.systemTempDirectory,manifest,manifest);
-        final dynamic versionInfo = jsonDecode(project.getVersionInfo());
+        final Map<String, dynamic> versionInfo = jsonDecode(project.getVersionInfo()) as Map<String, dynamic>;
         expect(versionInfo['app_name'],'test');
         expect(versionInfo['version'],'1.0.0');
         expect(versionInfo['build_number'],'3');

packages/flutter_tools/test/integration.shard/command_output_test.dart

@@ -81,7 +81,7 @@ void main() {
     ]);
 
     // contains all of the experiments in features.dart
-    expect(result.stdout.split('\n'), containsAll(<Matcher>[
+    expect((result.stdout as String).split('\n'), containsAll(<Matcher>[
       for (final Feature feature in allFeatures)
         contains(feature.configSetting),
     ]));

packages/flutter_tools/test/integration.shard/flutter_gen_test.dart

@@ -35,8 +35,8 @@ void main() {
         .childDirectory('.dart_tool')
         .childFile('package_config.json')
         .readAsStringSync());
-    final dynamic collection = jsonContent['packages']
-        .firstWhere((dynamic e) => e['name'] == 'collection');
+    final Map<String, dynamic> collection = ((jsonContent as Map<String, dynamic>)['packages'] as Iterable<dynamic>)
+        .firstWhere((dynamic entry) => (entry as Map<String, dynamic>)['name'] == 'collection') as Map<String, dynamic>;
     expect(
       Uri.parse(collection['rootUri'] as String).isAbsolute,
       isTrue,

packages/flutter_tools/test/integration.shard/hot_reload_test.dart

@@ -190,6 +190,6 @@ bool _isHotReloadCompletionEvent(Map<String, dynamic> event) {
   return event != null &&
       event['event'] == 'app.progress' &&
       event['params'] != null &&
-      event['params']['progressId'] == 'hot.reload' &&
-      event['params']['finished'] == true;
+      (event['params'] as Map<String, dynamic>)['progressId'] == 'hot.reload' &&
+      (event['params'] as Map<String, dynamic>)['finished'] == true;
 }

packages/flutter_tools/test/integration.shard/test_driver.dart

@@ -387,11 +387,14 @@ abstract class FlutterTestDriver {
         await subscription.cancel();
         final StringBuffer error = StringBuffer();
         error.write('Received app.stop event while waiting for $interestingOccurrence\n\n$_errorBuffer');
-        if (json['params'] != null && json['params']['error'] != null) {
-          error.write('${json['params']['error']}\n\n');
+        if (json['params'] != null) {
+          final Map<String, dynamic> params = json['params'] as Map<String, dynamic>;
+          if (params['error'] != null) {
+            error.write('${params['error']}\n\n');
+          }
+          if (json['params'] != null && params['trace'] != null) {
+            error.write('${params['trace']}\n\n');
           }
-        if (json['params'] != null && json['params']['trace'] != null) {
-          error.write('${json['params']['trace']}\n\n');
         }
         response.completeError(Exception(error.toString()));
       }
@@ -563,7 +566,7 @@ class FlutterRunTestDriver extends FlutterTestDriver {
         // _process.kill() (`flutter` is a shell script so _process itself is a
         // shell, not the flutter tool's Dart process).
         final Map<String, dynamic> connected = await _waitFor(event: 'daemon.connected');
-        _processPid = connected['params']['pid'] as int;
+        _processPid = (connected['params'] as Map<String, dynamic>)['pid'] as int;
 
         // Set this up now, but we don't wait it yet. We want to make sure we don't
         // miss it while waiting for debugPort below.
@@ -571,7 +574,7 @@ class FlutterRunTestDriver extends FlutterTestDriver {
 
         if (withDebugger) {
           final Map<String, dynamic> debugPort = await _waitFor(event: 'app.debugPort', timeout: appStartTimeout);
-          final String wsUriString = debugPort['params']['wsUri'] as String;
+          final String wsUriString = (debugPort['params'] as Map<String, dynamic>)['wsUri'] as String;
           _vmServiceWsUri = Uri.parse(wsUriString);
           await connectToVmService(pauseOnExceptions: pauseOnExceptions);
           if (!startPaused) {
@@ -588,7 +591,7 @@ class FlutterRunTestDriver extends FlutterTestDriver {
 
         // Now await the started event; if it had already happened the future will
         // have already completed.
-        _currentRunningAppId = (await started)['params']['appId'] as String;
+        _currentRunningAppId = ((await started)['params'] as Map<String, dynamic>)['appId'] as String;
         prematureExitGuard.complete();
       } on Exception catch (error, stackTrace) {
         prematureExitGuard.completeError(Exception(error.toString()), stackTrace);
@@ -618,10 +621,10 @@ class FlutterRunTestDriver extends FlutterTestDriver {
     }
 
     _debugPrint('Performing ${ pause ? "paused " : "" }${ fullRestart ? "hot restart" : "hot reload" }...');
-    final dynamic hotReloadResponse = await _sendRequest(
+    final Map<String, dynamic> hotReloadResponse = await _sendRequest(
       'app.restart',
       <String, dynamic>{'appId': _currentRunningAppId, 'fullRestart': fullRestart, 'pause': pause, 'debounce': debounce, 'debounceDurationOverrideMs': debounceDurationOverrideMs},
-    );
+    ) as Map<String, dynamic>;
     _debugPrint('${fullRestart ? "Hot restart" : "Hot reload"} complete.');
 
     if (hotReloadResponse == null || hotReloadResponse['code'] != 0) {
@@ -760,8 +763,9 @@ class FlutterTestTestDriver extends FlutterTestDriver {
     _processPid = version['pid'] as int;
 
     if (withDebugger) {
-      final Map<String, dynamic> startedProcess = await _waitFor(event: 'test.startedProcess', timeout: appStartTimeout);
-      final String vmServiceHttpString = startedProcess['params']['observatoryUri'] as String;
+      final Map<String, dynamic> startedProcessParams =
+          (await _waitFor(event: 'test.startedProcess', timeout: appStartTimeout))['params'] as Map<String, dynamic>;
+      final String vmServiceHttpString = startedProcessParams['observatoryUri'] as String;
       _vmServiceWsUri = Uri.parse(vmServiceHttpString).replace(scheme: 'ws', path: '/ws');
       await connectToVmService(pauseOnExceptions: pauseOnExceptions);
       // Allow us to run code before we start, eg. to set up breakpoints.
@@ -824,7 +828,7 @@ Stream<String> transformToLines(Stream<List<int>> byteStream) {
 Map<String, dynamic> parseFlutterResponse(String line) {
   if (line.startsWith('[') && line.endsWith(']') && line.length > 2) {
     try {
-      final Map<String, dynamic> response = castStringKeyedMap(json.decode(line)[0]);
+      final Map<String, dynamic> response = castStringKeyedMap((json.decode(line) as List<dynamic>)[0]);
       return response;
     } on FormatException {
       // Not valid JSON, so likely some other output that was surrounded by [brackets]

packages/flutter_tools/test/src/pubspec_schema.dart

@@ -19,18 +19,19 @@ void validatePubspecForPlugin({
 }) {
   final FlutterManifest manifest =
       FlutterManifest.createFromPath('$projectDir/pubspec.yaml', fileSystem: globals.fs, logger: globals.logger)!;
-  final YamlMap platformsMap = YamlMap.wrap(manifest.supportedPlatforms!);
+  final YamlMap platformMaps = YamlMap.wrap(manifest.supportedPlatforms!);
   for (final String platform in expectedPlatforms) {
-    expect(platformsMap[platform], isNotNull);
-    expect(platformsMap[platform]['pluginClass'], pluginClass);
+    expect(platformMaps[platform], isNotNull);
+    final YamlMap platformMap = platformMaps[platform]! as YamlMap;
+    expect(platformMap['pluginClass'], pluginClass);
     if (platform == 'android') {
-      expect(platformsMap[platform]['package'], androidIdentifier);
+      expect(platformMap['package'], androidIdentifier);
     }
     if (platform == 'web') {
-      expect(platformsMap[platform]['fileName'], webFileName);
+      expect(platformMap['fileName'], webFileName);
     }
   }
   for (final String platform in unexpectedPlatforms) {
-    expect(platformsMap[platform], isNull);
+    expect(platformMaps[platform], isNull);
   }
 }

packages/flutter_web_plugins/lib/src/plugin_registry.dart

@@ -62,7 +62,7 @@ class Registrar extends BinaryMessenger {
   /// compiling for the web.
   void registerMessageHandler() {
     // The `ui.webOnlySetPluginHandler` function below is only defined in the Web dart:ui.
-    // ignore: undefined_function
+    // ignore: undefined_function, avoid_dynamic_calls
     ui.webOnlySetPluginHandler(handleFrameworkMessage);
   }
 

packages/integration_test/lib/integration_test_driver_extended.dart

@@ -9,10 +9,13 @@ import 'package:flutter_driver/flutter_driver.dart';
 
 import 'common.dart';
 
+/// A callback to use with [integrationDriver].
+typedef ScreenshotCallback = Future<bool> Function(String name, List<int> image);
+
 /// Example Integration Test which can also run WebDriver command depending on
 /// the requests coming from the test methods.
 Future<void> integrationDriver(
-    {FlutterDriver? driver, Function? onScreenshot}) async {
+    {FlutterDriver? driver, ScreenshotCallback? onScreenshot}) async {
   driver ??= await FlutterDriver.connect();
   // Test states that it's waiting on web driver commands.
   // [DriverTestMessage] is converted to string since json format causes an
@@ -28,11 +31,12 @@ Future<void> integrationDriver(
       response.data!['web_driver_command'] != '${WebDriverCommandType.noop}') {
     final String? webDriverCommand = response.data!['web_driver_command'] as String?;
     if (webDriverCommand == '${WebDriverCommandType.screenshot}') {
+      assert(onScreenshot != null, 'screenshot command requires an onScreenshot callback');
       // Use `driver.screenshot()` method to get a screenshot of the web page.
       final List<int> screenshotImage = await driver.screenshot();
-      final String? screenshotName = response.data!['screenshot_name'] as String?;
+      final String screenshotName = response.data!['screenshot_name']! as String;
 
-      final bool screenshotSuccess = await onScreenshot!(screenshotName, screenshotImage) as bool;
+      final bool screenshotSuccess = await onScreenshot!(screenshotName, screenshotImage);
       if (screenshotSuccess) {
         jsonResponse = await driver.requestData(DriverTestMessage.complete().toString());
       } else {