diff --git a/dev/benchmarks/macrobenchmarks/lib/src/web/recorder.dart b/dev/benchmarks/macrobenchmarks/lib/src/web/recorder.dart
index 614f6aa349b..89661d6ddac 100644
--- a/dev/benchmarks/macrobenchmarks/lib/src/web/recorder.dart
+++ b/dev/benchmarks/macrobenchmarks/lib/src/web/recorder.dart
@@ -83,8 +83,6 @@ Future<void> _dummyAsyncVoidCallback() async {}
 @sealed
 class Runner {
   /// Creates a runner for the [recorder].
-  ///
-  /// All arguments must not be null.
   Runner({
     required this.recorder,
     this.setUpAllDidRun = _dummyAsyncVoidCallback,
diff --git a/dev/tools/gen_keycodes/lib/physical_key_data.dart b/dev/tools/gen_keycodes/lib/physical_key_data.dart
index 8bc7065ea8c..b71a7cba151 100644
--- a/dev/tools/gen_keycodes/lib/physical_key_data.dart
+++ b/dev/tools/gen_keycodes/lib/physical_key_data.dart
@@ -214,8 +214,6 @@ class PhysicalKeyData {
 /// written with the [toJson] method.
 class PhysicalKeyEntry {
   /// Creates a single key entry from available data.
-  ///
-  /// The [usbHidCode] and [chromiumName] parameters must not be null.
   PhysicalKeyEntry({
     required this.usbHidCode,
     required this.name,
diff --git a/examples/layers/rendering/src/sector_layout.dart b/examples/layers/rendering/src/sector_layout.dart
index e2716171f79..a8bfa641f94 100644
--- a/examples/layers/rendering/src/sector_layout.dart
+++ b/examples/layers/rendering/src/sector_layout.dart
@@ -636,8 +636,6 @@ class SectorHitTestResult extends HitTestResult {
 /// A hit test entry used by [RenderSector].
 class SectorHitTestEntry extends HitTestEntry {
   /// Creates a box hit test entry.
-  ///
-  /// The [radius] and [theta] argument must not be null.
   SectorHitTestEntry(RenderSector super.target, { required this.radius,  required this.theta });
 
   @override
diff --git a/packages/flutter_driver/lib/src/common/wait.dart b/packages/flutter_driver/lib/src/common/wait.dart
index 5d9e86fefbe..0c19ce48c68 100644
--- a/packages/flutter_driver/lib/src/common/wait.dart
+++ b/packages/flutter_driver/lib/src/common/wait.dart
@@ -9,8 +9,6 @@ import 'message.dart';
 /// A Flutter Driver command that waits until a given [condition] is satisfied.
 class WaitForCondition extends Command {
   /// Creates a command that waits for the given [condition] is met.
-  ///
-  /// The [condition] argument must not be null.
   const WaitForCondition(this.condition, {super.timeout});
 
   /// Deserializes this command from the value generated by [serialize].
@@ -89,8 +87,6 @@ class NoTransientCallbacks extends SerializableWaitCondition {
 
   /// Factory constructor to parse a [NoTransientCallbacks] instance from the
   /// given JSON map.
-  ///
-  /// The [json] argument must not be null.
   factory NoTransientCallbacks.deserialize(Map<String, String> json) {
     if (json['conditionName'] != 'NoTransientCallbacksCondition') {
       throw SerializationException('Error occurred during deserializing the NoTransientCallbacksCondition JSON string: $json');
@@ -109,8 +105,6 @@ class NoPendingFrame extends SerializableWaitCondition {
 
   /// Factory constructor to parse a [NoPendingFrame] instance from the given
   /// JSON map.
-  ///
-  /// The [json] argument must not be null.
   factory NoPendingFrame.deserialize(Map<String, String> json) {
     if (json['conditionName'] != 'NoPendingFrameCondition') {
       throw SerializationException('Error occurred during deserializing the NoPendingFrameCondition JSON string: $json');
@@ -129,8 +123,6 @@ class FirstFrameRasterized extends SerializableWaitCondition {
 
   /// Factory constructor to parse a [FirstFrameRasterized] instance from the
   /// given JSON map.
-  ///
-  /// The [json] argument must not be null.
   factory FirstFrameRasterized.deserialize(Map<String, String> json) {
     if (json['conditionName'] != 'FirstFrameRasterizedCondition') {
       throw SerializationException('Error occurred during deserializing the FirstFrameRasterizedCondition JSON string: $json');
@@ -152,8 +144,6 @@ class NoPendingPlatformMessages extends SerializableWaitCondition {
 
   /// Factory constructor to parse a [NoPendingPlatformMessages] instance from the
   /// given JSON map.
-  ///
-  /// The [json] argument must not be null.
   factory NoPendingPlatformMessages.deserialize(Map<String, String> json) {
     if (json['conditionName'] != 'NoPendingPlatformMessagesCondition') {
       throw SerializationException('Error occurred during deserializing the NoPendingPlatformMessagesCondition JSON string: $json');
@@ -168,14 +158,10 @@ class NoPendingPlatformMessages extends SerializableWaitCondition {
 /// A combined condition that waits until all the given [conditions] are met.
 class CombinedCondition extends SerializableWaitCondition {
   /// Creates a [CombinedCondition] condition.
-  ///
-  /// The [conditions] argument must not be null.
   const CombinedCondition(this.conditions);
 
   /// Factory constructor to parse a [CombinedCondition] instance from the
   /// given JSON map.
-  ///
-  /// The [jsonMap] argument must not be null.
   factory CombinedCondition.deserialize(Map<String, String> jsonMap) {
     if (jsonMap['conditionName'] != 'CombinedCondition') {
       throw SerializationException('Error occurred during deserializing the CombinedCondition JSON string: $jsonMap');
@@ -210,8 +196,6 @@ class CombinedCondition extends SerializableWaitCondition {
 }
 
 /// Parses a [SerializableWaitCondition] or its subclass from the given [json] map.
-///
-/// The [json] argument must not be null.
 SerializableWaitCondition _deserialize(Map<String, String> json) {
   final String conditionName = json['conditionName']!;
   switch (conditionName) {
diff --git a/packages/flutter_driver/lib/src/extension/wait_conditions.dart b/packages/flutter_driver/lib/src/extension/wait_conditions.dart
index 1f61bcc1ca0..424a0adf937 100644
--- a/packages/flutter_driver/lib/src/extension/wait_conditions.dart
+++ b/packages/flutter_driver/lib/src/extension/wait_conditions.dart
@@ -39,8 +39,6 @@ class _InternalNoTransientCallbacksCondition implements WaitCondition {
 
   /// Factory constructor to parse an [InternalNoTransientCallbacksCondition]
   /// instance from the given [SerializableWaitCondition] instance.
-  ///
-  /// The [condition] argument must not be null.
   factory _InternalNoTransientCallbacksCondition.deserialize(SerializableWaitCondition condition) {
     if (condition.conditionName != 'NoTransientCallbacksCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
@@ -67,8 +65,6 @@ class _InternalNoPendingFrameCondition implements WaitCondition {
 
   /// Factory constructor to parse an [InternalNoPendingFrameCondition] instance
   /// from the given [SerializableWaitCondition] instance.
-  ///
-  /// The [condition] argument must not be null.
   factory _InternalNoPendingFrameCondition.deserialize(SerializableWaitCondition condition) {
     if (condition.conditionName != 'NoPendingFrameCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
@@ -95,8 +91,6 @@ class _InternalFirstFrameRasterizedCondition implements WaitCondition {
 
   /// Factory constructor to parse an [InternalNoPendingFrameCondition] instance
   /// from the given [SerializableWaitCondition] instance.
-  ///
-  /// The [condition] argument must not be null.
   factory _InternalFirstFrameRasterizedCondition.deserialize(SerializableWaitCondition condition) {
     if (condition.conditionName != 'FirstFrameRasterizedCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
@@ -121,8 +115,6 @@ class _InternalNoPendingPlatformMessagesCondition implements WaitCondition {
 
   /// Factory constructor to parse an [_InternalNoPendingPlatformMessagesCondition] instance
   /// from the given [SerializableWaitCondition] instance.
-  ///
-  /// The [condition] argument must not be null.
   factory _InternalNoPendingPlatformMessagesCondition.deserialize(SerializableWaitCondition condition) {
     if (condition.conditionName != 'NoPendingPlatformMessagesCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
@@ -150,14 +142,10 @@ class _InternalNoPendingPlatformMessagesCondition implements WaitCondition {
 class _InternalCombinedCondition implements WaitCondition {
   /// Creates an [_InternalCombinedCondition] instance with the given list of
   /// [conditions].
-  ///
-  /// The [conditions] argument must not be null.
   const _InternalCombinedCondition(this.conditions);
 
   /// Factory constructor to parse an [_InternalCombinedCondition] instance from
   /// the given [SerializableWaitCondition] instance.
-  ///
-  /// The [condition] argument must not be null.
   factory _InternalCombinedCondition.deserialize(SerializableWaitCondition condition) {
     if (condition.conditionName != 'CombinedCondition') {
       throw SerializationException('Error occurred during deserializing from the given condition: ${condition.serialize()}');
@@ -187,8 +175,6 @@ class _InternalCombinedCondition implements WaitCondition {
 }
 
 /// Parses a [WaitCondition] or its subclass from the given serializable [waitCondition].
-///
-/// The [waitCondition] argument must not be null.
 WaitCondition deserializeCondition(SerializableWaitCondition waitCondition) {
   final String conditionName = waitCondition.conditionName;
   switch (conditionName) {
diff --git a/packages/flutter_test/lib/src/animation_sheet.dart b/packages/flutter_test/lib/src/animation_sheet.dart
index 48b5d269ab5..3d0d0bf65ed 100644
--- a/packages/flutter_test/lib/src/animation_sheet.dart
+++ b/packages/flutter_test/lib/src/animation_sheet.dart
@@ -175,8 +175,6 @@ class AnimationSheetBuilder {
   /// [collate]. If neither condition is met, the frames are not recorded, which
   /// is useful during setup phases.
   ///
-  /// The `child` must not be null.
-  ///
   /// See also:
   ///
   ///  * [WidgetTester.pumpFrames], which renders a widget in a series of frames
diff --git a/packages/flutter_test/lib/src/binding.dart b/packages/flutter_test/lib/src/binding.dart
index b8710568084..7be1c7a71bb 100644
--- a/packages/flutter_test/lib/src/binding.dart
+++ b/packages/flutter_test/lib/src/binding.dart
@@ -782,7 +782,7 @@ abstract class TestWidgetsFlutterBinding extends BindingBase
   ///
   /// The `description` is used by the [LiveTestWidgetsFlutterBinding] to
   /// show a label on the screen during the test. The description comes from
-  /// the value passed to [testWidgets]. It must not be null.
+  /// the value passed to [testWidgets].
   Future<void> runTest(
     Future<void> Function() testBody,
     VoidCallback invariantTester, {
diff --git a/packages/flutter_test/lib/src/controller.dart b/packages/flutter_test/lib/src/controller.dart
index e1f668de245..d5763135a6c 100644
--- a/packages/flutter_test/lib/src/controller.dart
+++ b/packages/flutter_test/lib/src/controller.dart
@@ -1426,7 +1426,7 @@ abstract class WidgetController {
   /// Specify `platform` as one of the platforms allowed in
   /// [platform.Platform.operatingSystem] to make the event appear to be from
   /// that type of system. Defaults to "web" on web, and "android" everywhere
-  /// else. Must not be null.
+  /// else.
   ///
   /// Specify the `physicalKey` for the event to override what is included in
   /// the simulated event. If not specified, it uses a default from the US
@@ -1471,7 +1471,7 @@ abstract class WidgetController {
   /// Specify `platform` as one of the platforms allowed in
   /// [platform.Platform.operatingSystem] to make the event appear to be from
   /// that type of system. Defaults to "web" on web, and "android" everywhere
-  /// else. Must not be null.
+  /// else.
   ///
   /// Specify the `physicalKey` for the event to override what is included in
   /// the simulated event. If not specified, it uses a default from the US
diff --git a/packages/flutter_test/lib/src/test_default_binary_messenger.dart b/packages/flutter_test/lib/src/test_default_binary_messenger.dart
index f5c4e2f5293..25647bc9d90 100644
--- a/packages/flutter_test/lib/src/test_default_binary_messenger.dart
+++ b/packages/flutter_test/lib/src/test_default_binary_messenger.dart
@@ -47,8 +47,6 @@ typedef AllMessagesHandler = Future<ByteData?>? Function(
 /// Listeners for these messages are configured using [setMessageHandler].
 class TestDefaultBinaryMessenger extends BinaryMessenger {
   /// Creates a [TestDefaultBinaryMessenger] instance.
-  ///
-  /// The [delegate] instance must not be null.
   TestDefaultBinaryMessenger(
     this.delegate, {
     Map<String, MessageHandler> outboundHandlers = const <String, MessageHandler>{},
diff --git a/packages/flutter_tools/lib/src/build_system/targets/icon_tree_shaker.dart b/packages/flutter_tools/lib/src/build_system/targets/icon_tree_shaker.dart
index 7f3b0dee8bd..916d1b3f592 100644
--- a/packages/flutter_tools/lib/src/build_system/targets/icon_tree_shaker.dart
+++ b/packages/flutter_tools/lib/src/build_system/targets/icon_tree_shaker.dart
@@ -28,8 +28,6 @@ List<Map<String, Object?>> _getList(Object? object, String errorMessage) {
 class IconTreeShaker {
   /// Creates a wrapper for icon font subsetting.
   ///
-  /// The environment parameter must not be null.
-  ///
   /// If the `fontManifest` parameter is null, [enabled] will return false since
   /// there are no fonts to shake.
   ///
diff --git a/packages/flutter_tools/lib/src/ios/plist_parser.dart b/packages/flutter_tools/lib/src/ios/plist_parser.dart
index de40cedff8e..b736f7cd636 100644
--- a/packages/flutter_tools/lib/src/ios/plist_parser.dart
+++ b/packages/flutter_tools/lib/src/ios/plist_parser.dart
@@ -44,8 +44,6 @@ class PlistParser {
   ///
   /// If [plistFilePath] points to a non-existent file or a file that's not a
   /// valid property list file, this will return null.
-  ///
-  /// The [plistFilePath] argument must not be null.
   String? plistXmlContent(String plistFilePath) {
     if (!_fileSystem.isFileSync(_plutilExecutable)) {
       throw const FileNotFoundException(_plutilExecutable);
@@ -101,8 +99,6 @@ class PlistParser {
   ///
   /// If [plistFilePath] points to a non-existent file or a file that's not a
   /// valid property list file, this will return an empty map.
-  ///
-  /// The [plistFilePath] argument must not be null.
   Map<String, Object> parseFile(String plistFilePath) {
     if (!_fileSystem.isFileSync(plistFilePath)) {
       return const <String, Object>{};
@@ -176,8 +172,6 @@ class PlistParser {
   /// valid property list file, this will return null.
   ///
   /// If [key] is not found in the property list, this will return null.
-  ///
-  /// The [plistFilePath] and [key] arguments must not be null.
   T? getValueFromFile<T>(String plistFilePath, String key) {
     final Map<String, dynamic> parsed = parseFile(plistFilePath);
     return parsed[key] as T?;
diff --git a/packages/flutter_web_plugins/lib/src/plugin_event_channel.dart b/packages/flutter_web_plugins/lib/src/plugin_event_channel.dart
index 00bd96a6726..d679e24caee 100644
--- a/packages/flutter_web_plugins/lib/src/plugin_event_channel.dart
+++ b/packages/flutter_web_plugins/lib/src/plugin_event_channel.dart
@@ -15,10 +15,9 @@ import 'plugin_registry.dart';
 /// channel sends a stream of events to the handler listening on the
 /// framework-side.
 ///
-/// The channel [name] must not be null. If no [codec] is provided, then
-/// [StandardMethodCodec] is used. If no [binaryMessenger] is provided, then
-/// [pluginBinaryMessenger], which sends messages to the framework-side,
-/// is used.
+/// If no [codec] is provided, then [StandardMethodCodec] is used. If no
+/// [binaryMessenger] is provided, then [pluginBinaryMessenger], which sends
+/// messages to the framework-side, is used.
 ///
 /// Channels created using this class implement two methods for
 /// subscribing to the event stream. The methods use the encoding of
@@ -37,8 +36,6 @@ import 'plugin_registry.dart';
 /// subscribed are silently discarded.
 class PluginEventChannel<T> {
   /// Creates a new plugin event channel.
-  ///
-  /// The [name] and [codec] arguments must not be null.
   const PluginEventChannel(
     this.name, [
     this.codec = const StandardMethodCodec(),
@@ -46,13 +43,11 @@ class PluginEventChannel<T> {
   ]);
 
   /// The logical channel on which communication happens.
-  ///
-  /// This must not be null.
   final String name;
 
   /// The message codec used by this channel.
   ///
-  /// This must not be null. This defaults to [StandardMethodCodec].
+  /// Defaults to [StandardMethodCodec].
   final MethodCodec codec;
 
   /// The messenger used by this channel to send platform messages.