diff --git a/packages/amplify_core/lib/src/types/auth/attribute/auth_user_attribute_key.dart b/packages/amplify_core/lib/src/types/auth/attribute/auth_user_attribute_key.dart
index a17900049e..04064286cf 100644
--- a/packages/amplify_core/lib/src/types/auth/attribute/auth_user_attribute_key.dart
+++ b/packages/amplify_core/lib/src/types/auth/attribute/auth_user_attribute_key.dart
@@ -9,7 +9,6 @@ import 'package:meta/meta.dart';
 /// {@template amplify_core.auth_user_attribute_key}
 /// A user attribute identifier.
 /// {@endtemplate}
-/// {@hideConstantImplementations}
 @immutable
 abstract class AuthUserAttributeKey
     with
diff --git a/packages/amplify_core/lib/src/types/auth/attribute/cognito_user_attribute_key.dart b/packages/amplify_core/lib/src/types/auth/attribute/cognito_user_attribute_key.dart
index 21e4867dae..ebda0d423c 100644
--- a/packages/amplify_core/lib/src/types/auth/attribute/cognito_user_attribute_key.dart
+++ b/packages/amplify_core/lib/src/types/auth/attribute/cognito_user_attribute_key.dart
@@ -12,7 +12,6 @@ import 'package:amplify_core/amplify_core.dart';
 /// [here](https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-settings-attributes.html).
 ///
 /// Use [CognitoUserAttributeKey.custom] to create a custom Cognito attribute.
-/// {@hideConstantImplementations}
 class CognitoUserAttributeKey extends AuthUserAttributeKey {
   const CognitoUserAttributeKey._(this._key, {this.readOnly = false})
       : isCustom = false;
diff --git a/packages/amplify_datastore/lib/src/utils/native_api_helpers.dart b/packages/amplify_datastore/lib/src/utils/native_api_helpers.dart
index b59aceb856..cfdaf14fc3 100644
--- a/packages/amplify_datastore/lib/src/utils/native_api_helpers.dart
+++ b/packages/amplify_datastore/lib/src/utils/native_api_helpers.dart
@@ -2,7 +2,6 @@ import 'dart:convert';
 
 import 'package:amplify_core/amplify_core.dart';
 import 'package:amplify_datastore/src/native_plugin.g.dart';
-import 'package:collection/collection.dart';
 
 /// Convert a [NativeGraphQLResponse] to a [GraphQLResponse]
 GraphQLRequest<String> nativeRequestToGraphQLRequest(
@@ -85,7 +84,7 @@ NativeGraphQLResponse graphQLResponseToNativeResponse(
 /// from a [GraphQLResponse]
 String _buildPayloadJson(GraphQLResponse<String> response) {
   final data = jsonDecode(response.data ?? '{}');
-  final errors = response.errors.whereNotNull().map((e) => e.toJson()).toList();
+  final errors = response.errors.nonNulls.map((e) => e.toJson()).toList();
   return jsonEncode({
     'data': data,
     'errors': errors,
diff --git a/packages/api/amplify_api_dart/lib/src/graphql/factories/graphql_request_factory.dart b/packages/api/amplify_api_dart/lib/src/graphql/factories/graphql_request_factory.dart
index 36ac085546..e5ce1b6ba2 100644
--- a/packages/api/amplify_api_dart/lib/src/graphql/factories/graphql_request_factory.dart
+++ b/packages/api/amplify_api_dart/lib/src/graphql/factories/graphql_request_factory.dart
@@ -176,11 +176,6 @@ class GraphQLRequestFactory {
           upperOutput = '(\$filter: ModelSubscription${modelName}FilterInput)';
           lowerOutput = r'(filter: $filter)';
         }
-      default:
-        throw const ApiOperationException(
-          'GraphQL Request Operation is currently unsupported',
-          recoverySuggestion: 'please use a supported GraphQL operation',
-        );
     }
 
     return DocumentInputs(upperOutput, lowerOutput);
diff --git a/packages/authenticator/amplify_authenticator/lib/src/blocs/auth/auth_bloc.dart b/packages/authenticator/amplify_authenticator/lib/src/blocs/auth/auth_bloc.dart
index 5604f7bd21..518957e292 100644
--- a/packages/authenticator/amplify_authenticator/lib/src/blocs/auth/auth_bloc.dart
+++ b/packages/authenticator/amplify_authenticator/lib/src/blocs/auth/auth_bloc.dart
@@ -261,8 +261,6 @@ class StateMachineBloc
             }
           }
           yield* _checkUserVerification();
-        default:
-          break;
       }
     } on AuthNotAuthorizedException {
       /// The .failAuthentication flag available in the DefineAuthChallenge Lambda trigger
diff --git a/packages/authenticator/amplify_authenticator/lib/src/screens/authenticator_screen.dart b/packages/authenticator/amplify_authenticator/lib/src/screens/authenticator_screen.dart
index 2524d2cb35..58f6e4a3db 100644
--- a/packages/authenticator/amplify_authenticator/lib/src/screens/authenticator_screen.dart
+++ b/packages/authenticator/amplify_authenticator/lib/src/screens/authenticator_screen.dart
@@ -192,7 +192,6 @@ class _FormWrapperView extends StatelessAuthenticatorComponent {
             form,
           ],
         );
-        break;
     }
 
     return Padding(padding: padding, child: layout);
diff --git a/packages/authenticator/amplify_authenticator/lib/src/widgets/form_fields/sign_in_form_field.dart b/packages/authenticator/amplify_authenticator/lib/src/widgets/form_fields/sign_in_form_field.dart
index d65618fa04..f7f941dbcf 100644
--- a/packages/authenticator/amplify_authenticator/lib/src/widgets/form_fields/sign_in_form_field.dart
+++ b/packages/authenticator/amplify_authenticator/lib/src/widgets/form_fields/sign_in_form_field.dart
@@ -159,8 +159,6 @@ class _SignInTextFieldState extends _SignInFormFieldState<String>
         return (v) => state.username = v;
       case SignInField.password:
         return (v) => state.password = v;
-      default:
-        return super.onChanged;
     }
   }
 
diff --git a/packages/aws_common/lib/src/http/aws_http_client_js.dart b/packages/aws_common/lib/src/http/aws_http_client_js.dart
index c764995b6c..1cc642e70b 100644
--- a/packages/aws_common/lib/src/http/aws_http_client_js.dart
+++ b/packages/aws_common/lib/src/http/aws_http_client_js.dart
@@ -71,13 +71,7 @@ class AWSHttpClientImpl extends AWSHttpClient {
           requestProgressController.close();
         },
       ).takeUntil(cancelTrigger.future);
-      Object body;
-      if (request.scheme == 'http' ||
-          supportedProtocols.supports(AlpnProtocol.http1_1)) {
-        body = Uint8List.fromList(await collectBytes(stream));
-      } else {
-        body = stream;
-      }
+      final body = Uint8List.fromList(await collectBytes(stream));
 
       if (completer.isCanceled) return;
       final resp = await fetch(