chore(repo): bump min Flutter to 3.44.0 and Dart SDK to 3.12.0 - #150
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Adopting a new Flutter stable and raising the published minimum are two different jobs that share the phrase "bump Flutter", and the second one is due on a fixed policy (minimum supported = latest stable - 1) rather than when something breaks. The skill separates them and records what this repo's CI actually checks, since most of the traps come from gaps between the jobs: - A floor raise moves two knobs, not three: `melos.yaml` (source of truth, propagated by `melos bs`) and `legacy_version_analyze.yml`. There is no `.fvmrc` here, so nothing pins a developer's toolchain to the floor. - Alchemist keys on `GITHUB_ACTIONS`, not the more common `CI`, so the obvious local invocation runs the untracked platform goldens and fails every golden test for reasons unrelated to the toolchain. - `package_analysis` analyzes `stream_core/lib` only, with `--fatal-warnings`. The beta canary and the N-1 job therefore say nothing about the Flutter packages, and nothing at all about the new infos that `--fatal-infos` turns into failures. - `all_lint_rules.yaml` is an explicit list, so a new SDK's rules never self-activate, and a removed rule surfaces as `undefined_lint` in that file rather than in `analysis_options.yaml`. - Raising the Dart constraint raises each package's language version, which wakes lints whose fix was not previously expressible. `dart fix` applies them mechanically and rewrites or deletes doc comments while doing so, so the diff needs reading in both directions. - Nothing in CI builds for Android or iOS, so platform build floors are invisible here and must not be reported as verified. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Flutter 3.47.0 went stable on 2026-08-12, so the "minimum supported = latest stable - 1" policy makes 3.44.0 (Dart 3.12.0) the new floor, up from 3.38.1 / 3.10.0. This is Track B only: CI already runs the new stable and is green on it, so no compat work was needed first. A floor raise is not breaking — existing code keeps compiling, older SDKs simply stop resolving the new version — so there is no `!` and the bullets go under a `🔄 Changed` heading. That heading had no entry in STYLE_GUIDE's list, which covered only features, fixes and removals; it is added there with the rule that a floor raise belongs under it rather than under `🛑 Breaking / Removals`. Two knobs move in lockstep: `melos.yaml`, which is the source of truth and propagates to all five package pubspecs on bootstrap, and `legacy_version_analyze.yml`, whose `flutter_version` is the floor's own regression test. That job was pinned to `3.38.10`, a patch of the old floor rather than the floor itself; it now names the floor exactly, so what CI proves is what the pubspecs claim. Raising the Dart constraint raises each package's language version, which activated `prefer_initializing_formals` on 24 previously-silent sites: Dart 3.12 legalised `this._privateField` as a named parameter, so the lint's suggested fix only became expressible now. Zero issues before the constraint moved, 24 after — caused by the floor, not by the new stable. Applied with `dart fix --apply --code=prefer_initializing_formals` and then audited by hand, since the fix is mechanical: - It rewrote five doc-comment references to the private field name (`[cdn]` -> `[_cdn]`), which would have leaked private names into public API docs while callers still pass the public name. Reverted; the diff now touches no comment line in either direction. - Every introduced `this._foo` replaced a parameter named exactly `foo`, so no public parameter was renamed. `melos run generate:all` produces no diff, confirming the generators still see the same names. Verified at both ends: `dart analyze --fatal-infos` is clean across all four packages on 3.47.0 (what CI resolves) and reports only one pre-existing info on 3.44.0 (the floor). `stream_core` 317 tests and `stream_thumbnail` 10 tests pass; `stream_core_flutter` fails the same 42 macOS-vs-Linux goldens as before the change, an identical set, so no golden was regenerated. Barrels and formatting pass. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe pull request adds a Flutter version-bump skill, raises minimum Dart and Flutter versions to 3.12.0 and 3.44.0, updates lint configuration, and applies constructor and asynchronous compatibility changes. ChangesFlutter version bump
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟠 High · up to The version-floor update includes constructor changes that still leave existing named-argument call sites and public APIs inconsistent, which can cause analyzer or compilation failures and break consumers; iOS thumbnail generation also does not explicitly handle a null native result. These concrete merge-readiness issues should be fixed or explicitly accepted before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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## main #150 +/- ##
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Coverage 59.47% 59.47%
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Files 192 192
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Actionable comments posted: 6
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Inline comments:
In `@apps/design_system_gallery/lib/config/theme_configuration.dart`:
- Around line 10-11: Restore public named constructor parameters and map them to
the corresponding private fields in ThemeConfiguration at
apps/design_system_gallery/lib/config/theme_configuration.dart:10-11, including
brightness, environment, cdn, and tokenProvider so ThemeConfiguration.dark() can
pass brightness. Apply the same public-parameter restoration and private-field
initializer mapping at
packages/stream_core/lib/src/api/system_environment_manager.dart:11-12,
packages/stream_core/lib/src/attachment/uploader/attachment_uploader.dart:56-57,
and packages/stream_core/lib/src/user/token_manager.dart:35-36, using each
constructor’s existing parameter and field names.
In
`@packages/stream_core_flutter/lib/src/components/common/stream_intrinsic_flex.dart`:
- Around line 496-510: Restore the public constructor parameter names expected
by createRenderObject for _RenderStreamIntrinsicFlex, especially direction,
mainAxisAlignment, mainAxisSize, spacing, textBaseline, textDirection,
verticalDirection, and clipBehavior. Keep the private fields initialized through
the initializer list while retaining the existing crossAxisAlignment validation.
In `@packages/stream_core_flutter/lib/src/components/sheet/stream_sheet.dart`:
- Around line 659-661: Restore the public named parameters in StreamSheet’s
constructors: use barrierColor and barrierOnTapHint, assigning them to
_barrierColor and _barrierOnTapHint in the initializer list. In
packages/stream_core_flutter/lib/src/factory/stream_component_factory.dart lines
671-672, restore the public builder parameter and initialize _builder in the
initializer list.
In `@packages/stream_core/lib/src/attachment/uploader/attachment_uploader.dart`:
- Around line 56-57: Update the StreamAttachmentUploader constructor to expose
the public named parameter cdn, then initialize the private _cdn field from that
parameter while preserving the required dependency injection behavior.
In `@packages/stream_core/lib/src/user/token_manager.dart`:
- Around line 35-36: Update the public TokenManager constructor to accept the
named parameter as required TokenProvider tokenProvider, then explicitly assign
it to the private _tokenProvider field instead of using required
this._tokenProvider.
In `@packages/stream_core/lib/src/ws/client/engine/stream_web_socket_engine.dart`:
- Around line 35-39: Restore the public named constructor parameters and assign
private fields via initializer lists: in
packages/stream_core/lib/src/ws/client/engine/stream_web_socket_engine.dart
lines 35-39, update StreamWebSocketEngine to accept listener and messageCodec;
in
packages/stream_core/lib/src/ws/client/reconnect/connection_recovery_handler.dart
lines 38-46, accept keepConnectionAliveInBackground and assign
_keepConnectionAliveInBackground; in
packages/stream_core/lib/src/ws/client/web_socket_health_monitor.dart lines
43-47, accept listener; and in
packages/stream_core_flutter/lib/src/components/common/stream_safe_area.dart
lines 74-86, make StreamSafeArea.driven accept listenable and to. Preserve
existing behavior and private field storage.
Apply the same fix in
`@packages/stream_core/lib/src/ws/client/reconnect/connection_recovery_handler.dart`
around lines 38 - 46.
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📒 Files selected for processing (25)
.claude/skills/flutter-version-bump/SKILL.md.github/workflows/legacy_version_analyze.ymlSTYLE_GUIDE.mdapps/design_system_gallery/lib/config/theme_configuration.dartapps/design_system_gallery/pubspec.yamlmelos.yamlpackages/stream_core/CHANGELOG.mdpackages/stream_core/lib/src/api/system_environment_manager.dartpackages/stream_core/lib/src/attachment/uploader/attachment_uploader.dartpackages/stream_core/lib/src/user/token_manager.dartpackages/stream_core/lib/src/ws/client/engine/stream_web_socket_engine.dartpackages/stream_core/lib/src/ws/client/reconnect/connection_recovery_handler.dartpackages/stream_core/lib/src/ws/client/web_socket_health_monitor.dartpackages/stream_core/pubspec.yamlpackages/stream_core_flutter/CHANGELOG.mdpackages/stream_core_flutter/lib/src/components/common/stream_intrinsic_flex.dartpackages/stream_core_flutter/lib/src/components/common/stream_safe_area.dartpackages/stream_core_flutter/lib/src/components/common/stream_tap_target_padding.dartpackages/stream_core_flutter/lib/src/components/sheet/stream_sheet.dartpackages/stream_core_flutter/lib/src/factory/stream_component_factory.dartpackages/stream_core_flutter/pubspec.yamlpackages/stream_thumbnail/CHANGELOG.mdpackages/stream_thumbnail/example/pubspec.yamlpackages/stream_thumbnail/pubspec.yamlpubspec.yaml
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`all_lint_rules.yaml` is a full enumeration of the linter's rules, so it goes stale on every SDK bump rather than growing on its own. Dart 3.13 added 15 and renamed one (`no_runtimeType_toString` -> `no_runtimetype_tostring`); all are recognised by the 3.47 analyzer, and none reports `undefined_lint` under the 3.44 floor. Three of them fire on existing code, 15 sites in total: - `async_return_with_no_await` (11) — each returned a future from an `async` body without awaiting it. Awaited rather than dropping `async`, which keeps the frame in the stack trace and leaves error timing alone. - `no_dynamic_casts` (3) — a `jsonDecode` result and two platform-channel replies were implicitly cast from `dynamic`. Made explicit; the casts already happened and threw the same way, they were just invisible. - `simple_directive_paths` (1) — `stream_color_scheme.dart` reached its sibling through `../../theme/primitives/`, unlike the two imports beside it. Two rules are disabled rather than adopted: - `unnecessary_await_in_return` directly contradicts `async_return_with_no_await` — it wants the `await` the other one demands, and 6 of the 11 sites above reported both at once. The newer rule wins. - `migrate_design_widgets` guards the `material_ui` migration, which lands separately. On this branch it fires on all 195 `package:flutter/material.dart` imports, so it stays listed and off until that work merges. Verified: analyze, barrels and formatting clean; `stream_core` 317 tests and `stream_thumbnail` 10 pass; `stream_core_flutter` fails the same 42 macOS-vs-Linux goldens as before, an identical set. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Inline comments:
In `@packages/stream_thumbnail/lib/src/stream_thumbnail_method_channel.dart`:
- Around line 157-158: Update the result handling in the method containing
_resolveFuture so a null thumbnailData result from iOS is handled explicitly
rather than cast to Object; preserve the existing Android true/result#data
completion behavior for non-null results.
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📒 Files selected for processing (13)
all_lint_rules.yamlanalysis_options.yamlapps/design_system_gallery/lib/components/common/stream_loading_spinner.dartpackages/stream_core/lib/src/api/stream_core_dio_error.dartpackages/stream_core/lib/src/attachment/attachment_file.dartpackages/stream_core/lib/src/attachment/uploader/attachment_uploader.dartpackages/stream_core/lib/src/ws/client/engine/stream_web_socket_engine.dartpackages/stream_core/lib/src/ws/client/reconnect/connection_recovery_handler.dartpackages/stream_core_flutter/lib/src/theme/semantics/stream_color_scheme.dartpackages/stream_core_flutter/test/flutter_test_config.dartpackages/stream_thumbnail/lib/src/stream_thumbnail.dartpackages/stream_thumbnail/lib/src/stream_thumbnail_method_channel.dartpackages/stream_thumbnail/lib/stream_thumbnail_web.dart
🚧 Files skipped from review as they are similar to previous changes (3)
- packages/stream_core/lib/src/attachment/uploader/attachment_uploader.dart
- packages/stream_core/lib/src/ws/client/engine/stream_web_socket_engine.dart
- packages/stream_core/lib/src/ws/client/reconnect/connection_recovery_handler.dart
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…fought it The previous commit resolved the clash between `async_return_with_no_await` and `unnecessary_await_in_return` the wrong way round: it disabled the rule the repo already had and rewrote 11 `return future` statements into `return await future` to satisfy the new one. Reverses that. `unnecessary_await_in_return` goes back to enabled and the 11 rewrites are undone, so the code is exactly as it was; the new rule is listed but off. Awaiting only pays for itself inside a `try`, where it decides whether the function catches its own errors — none of the 11 sites is in one, so all the rewrite bought was a stack frame. It also dragged the change through platform-channel and web code that no test covers, which is what dropped patch coverage to 16% on the previous push. What the new rules genuinely caught — three implicit `dynamic` casts and one needlessly indirect import path — is unaffected and stays. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The previous commit landed only part of it. `git checkout <ref> -- <paths>` stages as it writes, so the commit picked up exactly those eight files and the `git add` that was meant to catch the rest ran from a package directory, where its `.` pathspec matched nothing. Left behind, and included here: - `analysis_options.yaml` — `unnecessary_await_in_return` back to enabled and `async_return_with_no_await` off, which is the whole point of the revert. Without it CI kept the rules the wrong way round and reported all eight reverted sites. - The three `return await` in `stream_thumbnail_method_channel.dart`, which the checkout did not cover because that file also carries the `no_dynamic_casts` fixes and had to be edited rather than restored. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Checked the premise behind it first: of the 11 sites the rule flags, none returns from inside a `try`, and the 11 returns that are inside one all return synchronous values. So the case where the `await` changes behaviour — letting the function catch its own errors — does not occur here, and the note can just say so. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`no_dynamic_casts` made an existing implicit cast visible, and the cast turned out to be reachable: `StreamThumbnailPlugin.m` returns `nil` when generation fails and passes it straight to `result(data)`, so Flutter receives `null`, `result != true` holds, and the value was cast to a non-nullable `Object`. The caller got a `TypeError` about the cast rather than anything describing the failure. Android never reaches it — it replies `true` and delivers through the `result#data` callback. Widening `_resolveFuture` to `Object?` would only move the problem: the completers are `Completer<Object>` behind a `T extends Object` bound, and `thumbnailData`, `thumbnailFile` and `thumbnailFiles` all promise a value, so a null would fail at the caller's `await` instead — one frame later and less legibly. A missing thumbnail is a failure, not a value, so it now completes as a `PlatformException`, the path `_resolveFuture` already had for errors. Reported by CodeRabbit on #150. Behaviour before this commit was the same cast, written implicitly, so this is a latent bug the new lint surfaced rather than a regression it introduced. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The entry the previous commit owed: it changes published behaviour, so per STYLE_GUIDE it belongs under Upcoming in the package changelog. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`invokeMethod` returns `Future<T?>`, but with no type argument `T` infers as `dynamic` — which is where `no_dynamic_casts` was pointing. The previous commit answered it by casting the result; naming the type is the better answer, since the reply then arrives as `Object?` and there is nothing to cast. `<Object>` rather than anything narrower: all three methods answer `true` on Android before delivering out-of-band through the reverse callbacks, so `<String>` or `<Uint8List>` would throw there. Typing the replies made the `file` branch's silent assumption visible — `result as String` on an `Object?` trips `cast_nullable_to_non_nullable`, where the same cast from `dynamic` had been invisible. It now completes as a failure for anything that is not a path, matching the other two branches, so the reverse-callback protocol is handled the same way in all three places. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Reverts the null-result work — the `PlatformException` on a missing thumbnail, its regression test, the typed `invokeMethod<Object>` replies and the CHANGELOG entry. All of it was chased down from a CodeRabbit comment on the two explicit casts, and none of it belongs in a PR whose subject is the SDK floor and the lint list. What stays is the smallest thing that satisfies `no_dynamic_casts`: the two implicit `dynamic` -> `Object` casts, written explicitly. Behaviour is byte-for-byte what it was before this PR, a null reply included — the cast was always there, just invisible. Also untracks `example/linux/**`, which a `git add packages/stream_thumbnail` swept in while committing that work. Those files are generated by a Linux build and were untracked before. The underlying bug is real and still unfixed: iOS answers a failed generation with `result(nil)` while the `file` branch beside it answers with a `FlutterError`, so a null reaches Dart and dies on the cast. Fixing that belongs in the plugin, in its own PR, with an iOS build to verify — nothing in CI compiles the native sources. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Aug 17, 2026
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Description of the pull request
Flutter 3.47.0 went stable on 2026-08-12, so the "minimum supported = latest stable − 1" policy makes Flutter 3.44.0 / Dart 3.12.0 the new floor (up from 3.38.1 / 3.10.0).
This is a floor raise only. CI installs Flutter by channel (
stable), so it already runs 3.47.0 and is green on it — no compat work was needed first. A floor raise is not breaking: existing code keeps compiling, older SDKs simply stop resolving the new version, so there is no!and the CHANGELOG bullets go under🔄 Changed.This is the first of a two-PR stack. #151 migrates the packages to
material_ui/cupertino_ui, which requireflutter: >=3.44.0— this PR is what unblocks it.What changed
melos.yamlis the source of truth and propagates to all five package pubspecs on bootstrap;legacy_version_analyze.yml'sflutter_versionis the floor's own regression test. That job was pinned to3.38.10— a patch of the old floor rather than the floor itself — so it now names the floor exactly and proves what the pubspecs claim. There is no.fvmrcin this repo, so there is no third knob.pubspec.lock.stream_coreis pure Dart and correctly carries noflutterconstraint.prefer_initializing_formalson 24 previously-silent sites. Raising the Dart constraint raises each package's language version, and Dart 3.12 legalisedthis._privateFieldas a named parameter — so the lint's suggested fix only became expressible now. Zero violations before, 24 after; caused by the floor, not by the new stable. Applied viadart fix --apply --code=prefer_initializing_formals.stream_core(Dart SDK only),stream_core_flutterandstream_thumbnail. The latter two had no## Upcomingsection — both were just released — so one was added rather than filing under a published version, whichchangelog_placementwould reject.STYLE_GUIDE.mdgains the🔄 Changedheading. Its list covered only features, fixes and removals, and a floor raise is none of those.Manual review of the
dart fixpassdart fixis mechanical, not thoughtful, so the refactor was audited by hand:[cdn]→[_cdn],[tokenProvider]→[_tokenProvider],[to]/[listenable]→[_to]/[_listenable]), leaking private names into public API docs while callers still pass the public name. Reverted — the diff now touches no comment line in either direction (git diff -- '*.dart' | grep -E "^[-+]\s*(///|//)"is empty; checking only added lines would miss deletions).this._fooreplaced a parameter named exactlyfoo, socdn:,listener:,barrierColor:,builder:and friends are unchanged for callers.melos run generate:allproduces no diff, confirming the generators still see the same names.Testing
dart analyze --fatal-infos, 4 packages @ 3.47.0 (what CI resolves)legacy_version_analyzereplicated @ 3.44.0 —stream_core/libanalyze + testsdart format, 441 tracked files @ 3.44.0 and 3.47.0melos run check:barrels,melos run format:verifystream_core/stream_thumbnailtestsstream_core_fluttertests (GITHUB_ACTIONS=true)On the 42 golden failures: the committed goldens are Linux-rendered and these were run on macOS. The same suite was run on the unchanged tree under the same toolchain and the failure sets diffed —
commreturns empty in both directions. Zero introduced, so no golden was regenerated andupdate_goldens.ymlwas not dispatched. No.pngis touched by this diff.Note that alchemist here keys on
GITHUB_ACTIONS, notCI— a bareflutter testruns the untracked platform goldens instead.Out of scope (pre-existing, noted for follow-up)
stream_theme.dart:221reportsdeprecated_member_use_from_same_packageon 3.44.0 but not on 3.47.0 (StreamTheme.brightness→colorScheme.brightness). Pre-existing on the old floor too, and not gated by any job —legacy_version_analyzecoversstream_coreonly. Worth a small follow-up.analysis_options.yamlreportsremoved_lintforavoid_as(removed in Dart 2.12) anddeprecated_lintforprefer_final_parametersunder 3.47.melos run analyzenever analyses that file — it sits outside every package — so neither fails CI today. Cheap to delete now, expensive to hit as a hard failure later.legacy_version_analyzeand the weekly beta canary only coverstream_core, with--fatal-warningsonlib/alone. Neither says anything aboutstream_core_flutter,stream_thumbnailor the gallery, and neither catches the infos that--fatal-infosturns into failures. That gap is why the floor was verified by hand here.Not verified: nothing in CI builds for Android or iOS, so this repo has no platform build floors to move — but by the same token the gallery and the thumbnail example are unverified against any Flutter version.
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Summary by CodeRabbit
Changed
^3.12.0and Flutter>=3.44.0across the project, packages, examples, and CI checks.Documentation
Refactor