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Fix Navigator.pushNamed<T>() type checking - #188148
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This pull request refactors internal routing methods in Navigator to use Route<Object?> instead of generic types, and updates pushNamed, pushReplacement, and pushAndRemoveUntil to use async/await for casting results. It also adds a test case for handling non-Object type arguments. The review feedback suggests avoiding async/await in these high-frequency methods to prevent the overhead of creating asynchronous state machines, recommending instead to use .then for casting and preserving type safety.
| Future<T?> pushNamed<T extends Object?>(String routeName, {Object? arguments}) async { | ||
| final Object? result = await push<Object?>(_routeNamed(routeName, arguments: arguments)!); | ||
| return result as T?; | ||
| } |
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Using async/await here introduces unnecessary overhead by creating an async state machine for a highly-frequented framework method. Since this method is annotated with @awaitNotRequired and was previously a simple expression body, we can use .then to cast the result while keeping the method synchronous up to the point of returning the Future, adhering to the repository style guide's principle of optimizing for simplicity and readability.
Future<T?> pushNamed<T extends Object?>(String routeName, {Object? arguments}) {
return push<Object?>(_routeNamed(routeName, arguments: arguments)!)
.then<T?>((Object? result) => result as T?);
}References
- Suggest simplification and refactoring to enhance readability and maintainability. (link)
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The solution I implemented adheres more closely to the style guide than this suggestion.
For anything not covered by this document, check the Dart style guide for more advice.
The async/await syntax is mentioned explicitly in the Dart style guide:
PREFER async/await over using raw futures
Asynchronous code is notoriously hard to read and debug, even when using a nice abstraction like futures. The
async/awaitsyntax improves readability and lets you use all of the Dart control flow structures within your async code.
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I agree this is probably better with async/await, and same for the other cases below.
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It turns out that we do need to use .then() here; some tests expect errors to be thrown synchronously and the async messes that up. 🤷
justinmc
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LGTM 👍 . Thank you Nate! Sorry for the late review. Let's make sure the Google tests pass here.
| return true; | ||
| }()); | ||
| result.add( | ||
| navigator._routeNamed<dynamic>( |
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Yeah these dynamics are a code smell. I don't remember the context of when they were added, but I'd guess it was an oversight.
Be careful of breaking Google tests though. See #80965
| Future<T?> pushNamed<T extends Object?>(String routeName, {Object? arguments}) async { | ||
| final Object? result = await push<Object?>(_routeNamed(routeName, arguments: arguments)!); | ||
| return result as T?; | ||
| } |
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I agree this is probably better with async/await, and same for the other cases below.
|
ci.yaml validation failed; I'll do a rebase… |
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autosubmit label was removed for flutter/flutter/188148, because - The status or check suite Dashboard Checks has failed. Please fix the issues identified (or deflake) before re-applying this label. |
victorsanni
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Are there other methods that need this as well? e.g pushReplacementNamed and pushNamedAndRemoveUntil? Is there a plan for those or a tracking issue?
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It looks like this change is leading to some test failures; I'll try to get them resolved soon.
Are there other methods that need this as well? e.g
pushReplacementNamedandpushNamedAndRemoveUntil? Is there a plan for those or a tracking issue?
Both of those methods are covered in this PR!
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Looks like ci.yaml validation needs a rebase. Also, my recent changes dismissed the PR approvals, so it needs to be stamped again in order for all the checks to run. |
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justinmc
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LGTM as long as it passes tests. Let's also get @victorsanni's approval.
Roll Flutter from 15d8908addf6 to e8dca90ec9e0 (58 revisions) flutter/flutter@15d8908...e8dca90 2026-08-27 15619084+vashworth@users.noreply.github.com Terminate existing process before launching with devicectl (flutter/flutter#191885) 2026-08-27 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from qjOQi-zAgu_tADorh... to dDxH8G5cDBP602eyG... (flutter/flutter#191889) 2026-08-27 bkonyi@google.com [flutter_tools] Verify native assets tree-shaking during linking (flutter/flutter#191637) 2026-08-27 30870216+gaaclarke@users.noreply.github.com Denylists b-series powervr from vulkan (flutter/flutter#191808) 2026-08-27 97480502+b-luk@users.noreply.github.com Handle linear and radial gradients in UberSDF (flutter/flutter#190874) 2026-08-27 engine-flutter-autoroll@skia.org Roll Packages from 740f093 to bd3cbc1 (7 revisions) (flutter/flutter#191886) 2026-08-27 jason-simmons@users.noreply.github.com Disable more Windows tests that have been causing CI flakes (flutter/flutter#191822) 2026-08-27 engine-flutter-autoroll@skia.org Roll Skia from d32721369bd8 to 82e972ea84b1 (2 revisions) (flutter/flutter#191880) 2026-08-27 engine-flutter-autoroll@skia.org Roll Skia from 3640b8edd16c to d32721369bd8 (10 revisions) (flutter/flutter#191858) 2026-08-27 154381524+flutteractionsbot@users.noreply.github.com Revert: [AGP 9] Update remaining tests to AGP 9 (flutter/flutter#191863) 2026-08-27 engine-flutter-autoroll@skia.org Roll Fuchsia Test Scripts from 0iCv10IlKfiilEBOU... to 6SXRz6wsA2Zm_rAqP... (flutter/flutter#191852) 2026-08-27 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#191851) 2026-08-27 46920873+gabrimatic@users.noreply.github.com Refactor FormField build wrappers (flutter/flutter#185795) 2026-08-27 50643541+Mairramer@users.noreply.github.com Make ScrollPhysics reactive by introducing shouldUpdate (flutter/flutter#189664) 2026-08-27 chris@bracken.jp macOS: Fix crash on out-of-bounds text input ranges (flutter/flutter#191780) 2026-08-27 34871572+gmackall@users.noreply.github.com Add HCPP feature flag, and turn it on by default in beta/master (flutter/flutter#190623) 2026-08-27 bkonyi@google.com [tool] Migrate CleanCommand to modular dependency injection (flutter/flutter#190742) 2026-08-26 katelovett@google.com Update triage docs for ecosystem and codelab changes (flutter/flutter#191809) 2026-08-26 jesswon@google.com [AGP 9] Update remaining tests to AGP 9 (flutter/flutter#191824) 2026-08-26 louisehsu@google.com [UIScene] Migrate dev/benchmarks/complex_layout to UIScene lifecycle (flutter/flutter#191619) 2026-08-26 57765714+Vi-debug@users.noreply.github.com Add SliverAppBar showOnScreen semantics test coverage (flutter/flutter#190410) 2026-08-26 95318996+shawnridgeway-google@users.noreply.github.com Add prompt_suggestion icon to list of RTL mirroring icons. (flutter/flutter#191741) 2026-08-26 okorohelijah@google.com Remove bringup for batch 3 (flutter/flutter#191750) 2026-08-26 engine-flutter-autoroll@skia.org Roll Skia from b5465d7b0b77 to 3640b8edd16c (6 revisions) (flutter/flutter#191835) 2026-08-26 louisehsu@google.com Uiscene migrate custom channels views (flutter/flutter#191817) 2026-08-26 matt.boetger@gmail.com Support --[no-]adb-log-filtering CLI option (flutter/flutter#187252) 2026-08-26 engine-flutter-autoroll@skia.org Roll Dart SDK from cb8a4e1a0fbb to cb4c39d067f3 (2 revisions) (flutter/flutter#191825) 2026-08-26 nate.w5687@gmail.com Fix `Navigator.pushNamed<T>()` type checking (flutter/flutter#188148) 2026-08-26 robert.ancell@canonical.com Handle the case where a window doesn't have a title set (flutter/flutter#191767) 2026-08-26 github@alexv525.com [Android] Remove old `InputType` constructor from embedding (flutter/flutter#191244) 2026-08-26 engine-flutter-autoroll@skia.org Roll Skia from 244a6a0f8f92 to b5465d7b0b77 (19 revisions) (flutter/flutter#191810) 2026-08-26 46920873+gabrimatic@users.noreply.github.com Tolerate floating-point rounding in paintImage centerSlice assertion (flutter/flutter#185789) 2026-08-26 30870216+gaaclarke@users.noreply.github.com Fixes translated bounded blurs (flutter/flutter#191615) 2026-08-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from MstTWE1RDOT-RnrtH... to qjOQi-zAgu_tADorh... (flutter/flutter#191769) 2026-08-26 136096126+glitchfl@users.noreply.github.com Lerp HSVColor and HSLColor hue along the shortest arc (flutter/flutter#191186) 2026-08-26 116356835+AbdeMohlbi@users.noreply.github.com Fix enum instances comparison to use `equality ==` since dart has the correct behavior now (flutter/flutter#191537) 2026-08-26 30870216+gaaclarke@users.noreply.github.com Switches windows to opengles 3 (flutter/flutter#191516) 2026-08-26 engine-flutter-autoroll@skia.org Roll Dart SDK from 7739e8602bc1 to cb8a4e1a0fbb (1 revision) (flutter/flutter#191784) 2026-08-26 chris@bracken.jp iOS,macOS: Check viewType before creating a platform view (flutter/flutter#191777) 2026-08-26 154381524+flutteractionsbot@users.noreply.github.com Revert: [tool_tests] Remove bringup from Windows tool_tests_commands_2_2 (flutter/flutter#191793) 2026-08-26 kevmoo@users.noreply.github.com refactor(flutter_tools): clean up dead unreferenced declarations (flutter/flutter#191163) 2026-08-26 engine-flutter-autoroll@skia.org Roll Fuchsia GN SDK from a87CbQSWEjkPUK1ZY... to ZsxUUK2SfA-TrNvb8... (flutter/flutter#191763) 2026-08-26 bkonyi@google.com [tool_tests] Remove bringup from Windows tool_tests_commands_2_2 (flutter/flutter#191732) 2026-08-25 36861262+QuncCccccc@users.noreply.github.com Remove legacy gen_defaults analyze checks (flutter/flutter#191629) 2026-08-25 52160996+FMorschel@users.noreply.github.com Refactors `try` to avoid `unawaited_return_in_try_block` case (flutter/flutter#191129) 2026-08-25 engine-flutter-autoroll@skia.org Roll Dart SDK from 8996935d3d0a to 7739e8602bc1 (1 revision) (flutter/flutter#191754) ...
…r#12660) Roll Flutter from 15d8908addf6 to e8dca90ec9e0 (58 revisions) flutter/flutter@15d8908...e8dca90 2026-08-27 15619084+vashworth@users.noreply.github.com Terminate existing process before launching with devicectl (flutter/flutter#191885) 2026-08-27 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from qjOQi-zAgu_tADorh... to dDxH8G5cDBP602eyG... (flutter/flutter#191889) 2026-08-27 bkonyi@google.com [flutter_tools] Verify native assets tree-shaking during linking (flutter/flutter#191637) 2026-08-27 30870216+gaaclarke@users.noreply.github.com Denylists b-series powervr from vulkan (flutter/flutter#191808) 2026-08-27 97480502+b-luk@users.noreply.github.com Handle linear and radial gradients in UberSDF (flutter/flutter#190874) 2026-08-27 engine-flutter-autoroll@skia.org Roll Packages from 740f093 to bd3cbc1 (7 revisions) (flutter/flutter#191886) 2026-08-27 jason-simmons@users.noreply.github.com Disable more Windows tests that have been causing CI flakes (flutter/flutter#191822) 2026-08-27 engine-flutter-autoroll@skia.org Roll Skia from d32721369bd8 to 82e972ea84b1 (2 revisions) (flutter/flutter#191880) 2026-08-27 engine-flutter-autoroll@skia.org Roll Skia from 3640b8edd16c to d32721369bd8 (10 revisions) (flutter/flutter#191858) 2026-08-27 154381524+flutteractionsbot@users.noreply.github.com Revert: [AGP 9] Update remaining tests to AGP 9 (flutter/flutter#191863) 2026-08-27 engine-flutter-autoroll@skia.org Roll Fuchsia Test Scripts from 0iCv10IlKfiilEBOU... to 6SXRz6wsA2Zm_rAqP... (flutter/flutter#191852) 2026-08-27 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#191851) 2026-08-27 46920873+gabrimatic@users.noreply.github.com Refactor FormField build wrappers (flutter/flutter#185795) 2026-08-27 50643541+Mairramer@users.noreply.github.com Make ScrollPhysics reactive by introducing shouldUpdate (flutter/flutter#189664) 2026-08-27 chris@bracken.jp macOS: Fix crash on out-of-bounds text input ranges (flutter/flutter#191780) 2026-08-27 34871572+gmackall@users.noreply.github.com Add HCPP feature flag, and turn it on by default in beta/master (flutter/flutter#190623) 2026-08-27 bkonyi@google.com [tool] Migrate CleanCommand to modular dependency injection (flutter/flutter#190742) 2026-08-26 katelovett@google.com Update triage docs for ecosystem and codelab changes (flutter/flutter#191809) 2026-08-26 jesswon@google.com [AGP 9] Update remaining tests to AGP 9 (flutter/flutter#191824) 2026-08-26 louisehsu@google.com [UIScene] Migrate dev/benchmarks/complex_layout to UIScene lifecycle (flutter/flutter#191619) 2026-08-26 57765714+Vi-debug@users.noreply.github.com Add SliverAppBar showOnScreen semantics test coverage (flutter/flutter#190410) 2026-08-26 95318996+shawnridgeway-google@users.noreply.github.com Add prompt_suggestion icon to list of RTL mirroring icons. (flutter/flutter#191741) 2026-08-26 okorohelijah@google.com Remove bringup for batch 3 (flutter/flutter#191750) 2026-08-26 engine-flutter-autoroll@skia.org Roll Skia from b5465d7b0b77 to 3640b8edd16c (6 revisions) (flutter/flutter#191835) 2026-08-26 louisehsu@google.com Uiscene migrate custom channels views (flutter/flutter#191817) 2026-08-26 matt.boetger@gmail.com Support --[no-]adb-log-filtering CLI option (flutter/flutter#187252) 2026-08-26 engine-flutter-autoroll@skia.org Roll Dart SDK from cb8a4e1a0fbb to cb4c39d067f3 (2 revisions) (flutter/flutter#191825) 2026-08-26 nate.w5687@gmail.com Fix `Navigator.pushNamed<T>()` type checking (flutter/flutter#188148) 2026-08-26 robert.ancell@canonical.com Handle the case where a window doesn't have a title set (flutter/flutter#191767) 2026-08-26 github@alexv525.com [Android] Remove old `InputType` constructor from embedding (flutter/flutter#191244) 2026-08-26 engine-flutter-autoroll@skia.org Roll Skia from 244a6a0f8f92 to b5465d7b0b77 (19 revisions) (flutter/flutter#191810) 2026-08-26 46920873+gabrimatic@users.noreply.github.com Tolerate floating-point rounding in paintImage centerSlice assertion (flutter/flutter#185789) 2026-08-26 30870216+gaaclarke@users.noreply.github.com Fixes translated bounded blurs (flutter/flutter#191615) 2026-08-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from MstTWE1RDOT-RnrtH... to qjOQi-zAgu_tADorh... (flutter/flutter#191769) 2026-08-26 136096126+glitchfl@users.noreply.github.com Lerp HSVColor and HSLColor hue along the shortest arc (flutter/flutter#191186) 2026-08-26 116356835+AbdeMohlbi@users.noreply.github.com Fix enum instances comparison to use `equality ==` since dart has the correct behavior now (flutter/flutter#191537) 2026-08-26 30870216+gaaclarke@users.noreply.github.com Switches windows to opengles 3 (flutter/flutter#191516) 2026-08-26 engine-flutter-autoroll@skia.org Roll Dart SDK from 7739e8602bc1 to cb8a4e1a0fbb (1 revision) (flutter/flutter#191784) 2026-08-26 chris@bracken.jp iOS,macOS: Check viewType before creating a platform view (flutter/flutter#191777) 2026-08-26 154381524+flutteractionsbot@users.noreply.github.com Revert: [tool_tests] Remove bringup from Windows tool_tests_commands_2_2 (flutter/flutter#191793) 2026-08-26 kevmoo@users.noreply.github.com refactor(flutter_tools): clean up dead unreferenced declarations (flutter/flutter#191163) 2026-08-26 engine-flutter-autoroll@skia.org Roll Fuchsia GN SDK from a87CbQSWEjkPUK1ZY... to ZsxUUK2SfA-TrNvb8... (flutter/flutter#191763) 2026-08-26 bkonyi@google.com [tool_tests] Remove bringup from Windows tool_tests_commands_2_2 (flutter/flutter#191732) 2026-08-25 36861262+QuncCccccc@users.noreply.github.com Remove legacy gen_defaults analyze checks (flutter/flutter#191629) 2026-08-25 52160996+FMorschel@users.noreply.github.com Refactors `try` to avoid `unawaited_return_in_try_block` case (flutter/flutter#191129) 2026-08-25 engine-flutter-autoroll@skia.org Roll Dart SDK from 8996935d3d0a to 7739e8602bc1 (1 revision) (flutter/flutter#191754) ...
…r#12660) Roll Flutter from 15d8908addf6 to e8dca90ec9e0 (58 revisions) flutter/flutter@15d8908...e8dca90 2026-08-27 15619084+vashworth@users.noreply.github.com Terminate existing process before launching with devicectl (flutter/flutter#191885) 2026-08-27 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from qjOQi-zAgu_tADorh... to dDxH8G5cDBP602eyG... (flutter/flutter#191889) 2026-08-27 bkonyi@google.com [flutter_tools] Verify native assets tree-shaking during linking (flutter/flutter#191637) 2026-08-27 30870216+gaaclarke@users.noreply.github.com Denylists b-series powervr from vulkan (flutter/flutter#191808) 2026-08-27 97480502+b-luk@users.noreply.github.com Handle linear and radial gradients in UberSDF (flutter/flutter#190874) 2026-08-27 engine-flutter-autoroll@skia.org Roll Packages from 740f093 to bd3cbc1 (7 revisions) (flutter/flutter#191886) 2026-08-27 jason-simmons@users.noreply.github.com Disable more Windows tests that have been causing CI flakes (flutter/flutter#191822) 2026-08-27 engine-flutter-autoroll@skia.org Roll Skia from d32721369bd8 to 82e972ea84b1 (2 revisions) (flutter/flutter#191880) 2026-08-27 engine-flutter-autoroll@skia.org Roll Skia from 3640b8edd16c to d32721369bd8 (10 revisions) (flutter/flutter#191858) 2026-08-27 154381524+flutteractionsbot@users.noreply.github.com Revert: [AGP 9] Update remaining tests to AGP 9 (flutter/flutter#191863) 2026-08-27 engine-flutter-autoroll@skia.org Roll Fuchsia Test Scripts from 0iCv10IlKfiilEBOU... to 6SXRz6wsA2Zm_rAqP... (flutter/flutter#191852) 2026-08-27 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#191851) 2026-08-27 46920873+gabrimatic@users.noreply.github.com Refactor FormField build wrappers (flutter/flutter#185795) 2026-08-27 50643541+Mairramer@users.noreply.github.com Make ScrollPhysics reactive by introducing shouldUpdate (flutter/flutter#189664) 2026-08-27 chris@bracken.jp macOS: Fix crash on out-of-bounds text input ranges (flutter/flutter#191780) 2026-08-27 34871572+gmackall@users.noreply.github.com Add HCPP feature flag, and turn it on by default in beta/master (flutter/flutter#190623) 2026-08-27 bkonyi@google.com [tool] Migrate CleanCommand to modular dependency injection (flutter/flutter#190742) 2026-08-26 katelovett@google.com Update triage docs for ecosystem and codelab changes (flutter/flutter#191809) 2026-08-26 jesswon@google.com [AGP 9] Update remaining tests to AGP 9 (flutter/flutter#191824) 2026-08-26 louisehsu@google.com [UIScene] Migrate dev/benchmarks/complex_layout to UIScene lifecycle (flutter/flutter#191619) 2026-08-26 57765714+Vi-debug@users.noreply.github.com Add SliverAppBar showOnScreen semantics test coverage (flutter/flutter#190410) 2026-08-26 95318996+shawnridgeway-google@users.noreply.github.com Add prompt_suggestion icon to list of RTL mirroring icons. (flutter/flutter#191741) 2026-08-26 okorohelijah@google.com Remove bringup for batch 3 (flutter/flutter#191750) 2026-08-26 engine-flutter-autoroll@skia.org Roll Skia from b5465d7b0b77 to 3640b8edd16c (6 revisions) (flutter/flutter#191835) 2026-08-26 louisehsu@google.com Uiscene migrate custom channels views (flutter/flutter#191817) 2026-08-26 matt.boetger@gmail.com Support --[no-]adb-log-filtering CLI option (flutter/flutter#187252) 2026-08-26 engine-flutter-autoroll@skia.org Roll Dart SDK from cb8a4e1a0fbb to cb4c39d067f3 (2 revisions) (flutter/flutter#191825) 2026-08-26 nate.w5687@gmail.com Fix `Navigator.pushNamed<T>()` type checking (flutter/flutter#188148) 2026-08-26 robert.ancell@canonical.com Handle the case where a window doesn't have a title set (flutter/flutter#191767) 2026-08-26 github@alexv525.com [Android] Remove old `InputType` constructor from embedding (flutter/flutter#191244) 2026-08-26 engine-flutter-autoroll@skia.org Roll Skia from 244a6a0f8f92 to b5465d7b0b77 (19 revisions) (flutter/flutter#191810) 2026-08-26 46920873+gabrimatic@users.noreply.github.com Tolerate floating-point rounding in paintImage centerSlice assertion (flutter/flutter#185789) 2026-08-26 30870216+gaaclarke@users.noreply.github.com Fixes translated bounded blurs (flutter/flutter#191615) 2026-08-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from MstTWE1RDOT-RnrtH... to qjOQi-zAgu_tADorh... (flutter/flutter#191769) 2026-08-26 136096126+glitchfl@users.noreply.github.com Lerp HSVColor and HSLColor hue along the shortest arc (flutter/flutter#191186) 2026-08-26 116356835+AbdeMohlbi@users.noreply.github.com Fix enum instances comparison to use `equality ==` since dart has the correct behavior now (flutter/flutter#191537) 2026-08-26 30870216+gaaclarke@users.noreply.github.com Switches windows to opengles 3 (flutter/flutter#191516) 2026-08-26 engine-flutter-autoroll@skia.org Roll Dart SDK from 7739e8602bc1 to cb8a4e1a0fbb (1 revision) (flutter/flutter#191784) 2026-08-26 chris@bracken.jp iOS,macOS: Check viewType before creating a platform view (flutter/flutter#191777) 2026-08-26 154381524+flutteractionsbot@users.noreply.github.com Revert: [tool_tests] Remove bringup from Windows tool_tests_commands_2_2 (flutter/flutter#191793) 2026-08-26 kevmoo@users.noreply.github.com refactor(flutter_tools): clean up dead unreferenced declarations (flutter/flutter#191163) 2026-08-26 engine-flutter-autoroll@skia.org Roll Fuchsia GN SDK from a87CbQSWEjkPUK1ZY... to ZsxUUK2SfA-TrNvb8... (flutter/flutter#191763) 2026-08-26 bkonyi@google.com [tool_tests] Remove bringup from Windows tool_tests_commands_2_2 (flutter/flutter#191732) 2026-08-25 36861262+QuncCccccc@users.noreply.github.com Remove legacy gen_defaults analyze checks (flutter/flutter#191629) 2026-08-25 52160996+FMorschel@users.noreply.github.com Refactors `try` to avoid `unawaited_return_in_try_block` case (flutter/flutter#191129) 2026-08-25 engine-flutter-autoroll@skia.org Roll Dart SDK from 8996935d3d0a to 7739e8602bc1 (1 revision) (flutter/flutter#191754) ...
This PR allows the navigator's
pushNamed()method to be called with any type argument without immediately throwing an error.It also brings the framework more in line with the style guide:
Fixes #57186