flutter · justinmc · May 11, 2026 · May 11, 2026 · May 12, 2026 · May 12, 2026
diff --git a/analysis_options.yaml b/analysis_options.yaml
@@ -1,7 +1,7 @@
 # Specify analysis options.
 #
 # This file is a copy of analysis_options.yaml from flutter repo
-# as of 2023-12-18, but with some modifications marked with
+# as of 2026-05-11, but with some modifications marked with
 # "DIFFERENT FROM FLUTTER/FLUTTER" below. The file is expected to
 # be kept in sync with the master file from the flutter repo.
 
@@ -22,33 +22,40 @@ analyzer:
     - '**/*.g.dart'
     - '**/*.mocks.dart' # Mockito @GenerateMocks
 
+formatter:
+  page_width: 100
+
 linter:
   rules:
     # This list is derived from the list of all available lints located at
-    # https://github.com/dart-lang/linter/blob/main/example/all.yaml
+    # https://github.com/dart-lang/sdk/blob/main/pkg/linter/example/all.yaml
     - always_declare_return_types
     - always_put_control_body_on_new_line
     # - always_put_required_named_parameters_first # we prefer having parameters in the same order as fields https://github.com/flutter/flutter/issues/10219
     # - always_specify_types # conflicts with omit_obvious_local_variable_types
     # - always_use_package_imports # we do this commonly
     - annotate_overrides
-    # - avoid_annotating_with_dynamic # conflicts with always_specify_types
+    - annotate_redeclares
+    # - avoid_annotating_with_dynamic # conflicts with type_annotate_public_apis
     - avoid_bool_literals_in_conditional_expressions
     # - avoid_catches_without_on_clauses # blocked on https://github.com/dart-lang/linter/issues/3023
-    # - avoid_catching_errors # blocked on https://github.com/dart-lang/linter/issues/3023
+    # - avoid_catching_errors # blocked on https://github.com/dart-lang/linter/issues/4998
     # - avoid_classes_with_only_static_members # we do this commonly for `abstract final class`es
     - avoid_double_and_int_checks
     - avoid_dynamic_calls
     - avoid_empty_else
     - avoid_equals_and_hash_code_on_mutable_classes
     - avoid_escaping_inner_quotes
     - avoid_field_initializers_in_const_classes
-    # - avoid_final_parameters # incompatible with prefer_final_parameters
+    # TODO(kallentu): Remove this lint once the Dart SDK in Flutter is on version 3.13.
+    - avoid_final_parameters
     - avoid_function_literals_in_foreach_calls
+    # - avoid_futureor_void # not yet tested
     # - avoid_implementing_value_types # see https://github.com/dart-lang/linter/issues/4558
     - avoid_init_to_null
     - avoid_js_rounded_ints
     # - avoid_multiple_declarations_per_line # seems to be a stylistic choice we don't subscribe to
+    - avoid_null_checks_in_equality_operators
     # - 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)
@@ -64,7 +71,7 @@ linter:
     - avoid_slow_async_io
     - avoid_type_to_string
     - avoid_types_as_parameter_names
-    # - avoid_types_on_closure_parameters # conflicts with always_specify_types
+    # - avoid_types_on_closure_parameters # not yet tested
     - avoid_unnecessary_containers
     - avoid_unused_constructor_parameters
     - avoid_void_async
@@ -91,6 +98,7 @@ linter:
     - directives_ordering
     # - discarded_futures # too many false positives, similar to unawaited_futures
     # - do_not_use_environment # there are appropriate times to use the environment, especially in our tests and build logic
+    # - document_ignores # not yet tested
     - empty_catches
     - empty_constructor_bodies
     - empty_statements
@@ -103,6 +111,7 @@ linter:
     - implicit_call_tearoffs
     - implicit_reopen
     - invalid_case_patterns
+    - invalid_runtime_check_with_js_interop_types
     # - join_return_with_assignment # not required by flutter style
     - leading_newlines_in_multiline_strings
     - library_annotations
@@ -114,7 +123,7 @@ linter:
     # - matching_super_parameters # blocked on https://github.com/dart-lang/language/issues/2509
     - missing_code_block_language_in_doc_comment
     - missing_whitespace_between_adjacent_strings
-    # - no_adjacent_strings_in_list # conflicts with prefer_adjacent_string_concatenation
+    - no_adjacent_strings_in_list
     - no_default_cases
     - no_duplicate_case_values
     - no_leading_underscores_for_library_prefixes
@@ -128,12 +137,12 @@ linter:
     - noop_primitive_operations
     - null_check_on_nullable_type_parameter
     - null_closures
-    # - omit_local_variable_types # conflicts with specify_nonobvious_local_variable_types
+    # - omit_local_variable_types # superset of omit_obvious_local_variable_types
     - omit_obvious_local_variable_types
+    # - omit_obvious_property_types # conflicts with type_annotate_public_apis
     # - one_member_abstracts # too many false positives
     - only_throw_errors # this does get disabled in a few places where we have legacy code that uses strings et al
     - overridden_fields
-    # - package_api_docs # Deprecated (https://github.com/dart-lang/linter/issues/5107)
     - package_names
     - package_prefixed_library_names
     # - parameter_assignments # we do this commonly
@@ -149,8 +158,8 @@ linter:
     # - prefer_constructors_over_static_methods # far too many false positives
     - prefer_contains
     # - prefer_double_quotes # opposite of prefer_single_quotes
-    # - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md#consider-using--for-short-functions-and-methods
     - prefer_final_fields
+    # - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md#consider-using--for-short-functions-and-methods
     - prefer_final_in_for_each
     - prefer_final_locals
     # - prefer_final_parameters # adds too much verbosity
@@ -190,6 +199,7 @@ linter:
     - sort_unnamed_constructors_first
     - specify_nonobvious_local_variable_types
     - specify_nonobvious_property_types
+    - strict_top_level_inference
     - test_types_in_equals
     - throw_in_finally
     - tighten_type_of_initializing_formals
@@ -205,9 +215,11 @@ linter:
     - unnecessary_constructor_name
     # - unnecessary_final # conflicts with prefer_final_locals
     - unnecessary_getters_setters
+    # - unnecessary_ignore # Disabled by default to simplify migrations; should be periodically enabled locally to clean up offenders
     # - unnecessary_lambdas # has false positives: https://github.com/dart-lang/linter/issues/498
     - unnecessary_late
     - unnecessary_library_directive
+    # - unnecessary_library_name # blocked on https://github.com/dart-lang/dartdoc/issues/3882
     - unnecessary_new
     - unnecessary_null_aware_assignments
     - unnecessary_null_aware_operator_on_extension_on_nullable
@@ -222,8 +234,10 @@ linter:
     - unnecessary_string_interpolations
     - unnecessary_this
     - unnecessary_to_list_in_spreads
+    - unnecessary_underscores
     - unreachable_from_main
     - unrelated_type_equality_checks
+    # - unsafe_variance # not yet tested
     - use_build_context_synchronously
     - use_colored_box
     # - use_decorated_box # leads to bugs: DecoratedBox and Container are not equivalent (Container inserts extra padding)
@@ -243,5 +257,8 @@ linter:
     - use_super_parameters
     - use_test_throws_matchers
     # - use_to_and_as_if_applicable # has false positives, so we prefer to catch this by code-review
+    - use_truncating_division
     - valid_regexps
+    # TODO(kallentu): Remove this lint once the Dart SDK in Flutter is on version 3.13.
+    - var_with_no_type_annotation
     - void_checks
diff --git a/packages/animations/example/lib/container_transition.dart b/packages/animations/example/lib/container_transition.dart
@@ -49,8 +49,7 @@ class OpenContainerTransformDemo extends StatefulWidget {
   }
 }
 
-class _OpenContainerTransformDemoState
-    extends State<OpenContainerTransformDemo> {
+class _OpenContainerTransformDemoState extends State<OpenContainerTransformDemo> {
   ContainerTransitionType _transitionType = ContainerTransitionType.fade;
 
   void _showMarkedAsDoneSnackbar(bool? isMarkedAsDone) {
@@ -529,18 +528,18 @@ class _DetailsPage extends StatelessWidget {
                 Text(
                   'Title',
                   style: Theme.of(context).textTheme.headlineSmall!.copyWith(
-                    color: Colors.black54,
-                    fontSize: 30.0,
-                  ),
+                        color: Colors.black54,
+                        fontSize: 30.0,
+                      ),
                 ),
                 const SizedBox(height: 10),
                 Text(
                   _loremIpsumParagraph,
                   style: Theme.of(context).textTheme.bodyMedium!.copyWith(
-                    color: Colors.black54,
-                    height: 1.5,
-                    fontSize: 16.0,
-                  ),
+                        color: Colors.black54,
+                        height: 1.5,
+                        fontSize: 16.0,
+                      ),
                 ),
               ],
             ),

diff --git a/packages/animations/example/lib/fade_scale_transition.dart b/packages/animations/example/lib/fade_scale_transition.dart
@@ -11,8 +11,7 @@ class FadeScaleTransitionDemo extends StatefulWidget {
   const FadeScaleTransitionDemo({super.key});
 
   @override
-  State<FadeScaleTransitionDemo> createState() =>
-      _FadeScaleTransitionDemoState();
+  State<FadeScaleTransitionDemo> createState() => _FadeScaleTransitionDemoState();
 }
 
 class _FadeScaleTransitionDemoState extends State<FadeScaleTransitionDemo>
@@ -21,19 +20,18 @@ class _FadeScaleTransitionDemoState extends State<FadeScaleTransitionDemo>
 
   @override
   void initState() {
-    _controller =
-        AnimationController(
-          value: 0.0,
-          duration: const Duration(milliseconds: 150),
-          reverseDuration: const Duration(milliseconds: 75),
-          vsync: this,
-        )..addStatusListener((AnimationStatus status) {
-          setState(() {
-            // setState needs to be called to trigger a rebuild because
-            // the 'HIDE FAB'/'SHOW FAB' button needs to be updated based
-            // the latest value of [_controller.status].
-          });
+    _controller = AnimationController(
+      value: 0.0,
+      duration: const Duration(milliseconds: 150),
+      reverseDuration: const Duration(milliseconds: 75),
+      vsync: this,
+    )..addStatusListener((AnimationStatus status) {
+        setState(() {
+          // setState needs to be called to trigger a rebuild because
+          // the 'HIDE FAB'/'SHOW FAB' button needs to be updated based
+          // the latest value of [_controller.status].
         });
+      });
     super.initState();
   }
 

diff --git a/packages/animations/example/lib/fade_through_transition.dart b/packages/animations/example/lib/fade_through_transition.dart
@@ -11,8 +11,7 @@ class FadeThroughTransitionDemo extends StatefulWidget {
   const FadeThroughTransitionDemo({super.key});
 
   @override
-  State<FadeThroughTransitionDemo> createState() =>
-      _FadeThroughTransitionDemoState();
+  State<FadeThroughTransitionDemo> createState() => _FadeThroughTransitionDemoState();
 }
 
 class _FadeThroughTransitionDemoState extends State<FadeThroughTransitionDemo> {
@@ -25,18 +24,17 @@ class _FadeThroughTransitionDemoState extends State<FadeThroughTransitionDemo> {
     return Scaffold(
       appBar: AppBar(title: const Text('Fade through')),
       body: PageTransitionSwitcher(
-        transitionBuilder:
-            (
-              Widget child,
-              Animation<double> animation,
-              Animation<double> secondaryAnimation,
-            ) {
-              return FadeThroughTransition(
-                animation: animation,
-                secondaryAnimation: secondaryAnimation,
-                child: child,
-              );
-            },
+        transitionBuilder: (
+          Widget child,
+          Animation<double> animation,
+          Animation<double> secondaryAnimation,
+        ) {
+          return FadeThroughTransition(
+            animation: animation,
+            secondaryAnimation: secondaryAnimation,
+            child: child,
+          );
+        },
         child: pageList[pageIndex],
       ),
       bottomNavigationBar: BottomNavigationBar(

diff --git a/packages/animations/example/lib/shared_axis_transition.dart b/packages/animations/example/lib/shared_axis_transition.dart
@@ -17,8 +17,7 @@ class SharedAxisTransitionDemo extends StatefulWidget {
 }
 
 class _SharedAxisTransitionDemoState extends State<SharedAxisTransitionDemo> {
-  SharedAxisTransitionType? _transitionType =
-      SharedAxisTransitionType.horizontal;
+  SharedAxisTransitionType? _transitionType = SharedAxisTransitionType.horizontal;
   bool _isLoggedIn = false;
 
   void _updateTransitionType(SharedAxisTransitionType? newType) {
@@ -44,19 +43,18 @@ class _SharedAxisTransitionDemoState extends State<SharedAxisTransitionDemo> {
             Expanded(
               child: PageTransitionSwitcher(
                 reverse: !_isLoggedIn,
-                transitionBuilder:
-                    (
-                      Widget child,
-                      Animation<double> animation,
-                      Animation<double> secondaryAnimation,
-                    ) {
-                      return SharedAxisTransition(
-                        animation: animation,
-                        secondaryAnimation: secondaryAnimation,
-                        transitionType: _transitionType!,
-                        child: child,
-                      );
-                    },
+                transitionBuilder: (
+                  Widget child,
+                  Animation<double> animation,
+                  Animation<double> secondaryAnimation,
+                ) {
+                  return SharedAxisTransition(
+                    animation: animation,
+                    secondaryAnimation: secondaryAnimation,
+                    transitionType: _transitionType!,
+                    child: child,
+                  );
+                },
                 child: _isLoggedIn ? _CoursePage() : _SignInPage(),
               ),
             ),

diff --git a/packages/animations/lib/src/fade_scale_transition.dart b/packages/animations/lib/src/fade_scale_transition.dart
@@ -137,23 +137,21 @@ class FadeScaleTransition extends StatelessWidget {
   Widget build(BuildContext context) {
     return DualTransitionBuilder(
       animation: animation,
-      forwardBuilder:
-          (BuildContext context, Animation<double> animation, Widget? child) {
-            return FadeTransition(
-              opacity: _fadeInTransition.animate(animation),
-              child: ScaleTransition(
-                scale: _scaleInTransition.animate(animation),
-                child: child,
-              ),
-            );
-          },
-      reverseBuilder:
-          (BuildContext context, Animation<double> animation, Widget? child) {
-            return FadeTransition(
-              opacity: _fadeOutTransition.animate(animation),
-              child: child,
-            );
-          },
+      forwardBuilder: (BuildContext context, Animation<double> animation, Widget? child) {
+        return FadeTransition(
+          opacity: _fadeInTransition.animate(animation),
+          child: ScaleTransition(
+            scale: _scaleInTransition.animate(animation),
+            child: child,
+          ),
+        );
+      },
+      reverseBuilder: (BuildContext context, Animation<double> animation, Widget? child) {
+        return FadeTransition(
+          opacity: _fadeOutTransition.animate(animation),
+          child: child,
+        );
+      },
       child: child,
     );
   }