fix(theme): import CupertinoPageTransitionsBuilder explicitly (unbreaks analyze on Flutter 3.44.x) - #246
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CI is pinned to Flutter 3.41.6, where material.dart re-exports
CupertinoPageTransitionsBuilder, so this is green on the pin and is not a
broken build. On 3.44.x that re-export is gone and `flutter analyze` fails
with "The function 'CupertinoPageTransitionsBuilder' isn't defined", plus 4
knock-on errors as the surrounding `const` PageTransitionsTheme map loses its
constant value. Anyone developing on current stable hits 5 errors in a file
they did not touch.
theme.dart already predicted exactly this and wrote down the remedy:
// ...so if you bump the pin and this suddenly fails to resolve, re-add:
// import 'package:flutter/cupertino.dart' show CupertinoPageTransitionsBuilder;
This is that import, taken rather than left as a comment, so the file no longer
depends on which library happens to re-export the symbol this month.
Safe on both toolchains: material.dart re-exports the SAME declaration, and
Dart reports an ambiguity only when two DIFFERENT declarations share a name, so
the pin sees one element reachable by two routes. The `show` clause is
load-bearing — an unscoped cupertino import would genuinely collide with
material, which declares its own Card, Switch and Divider.
Verified on 3.44.6: `flutter analyze lib/` goes from 5 errors to clean, and
test/boot_splash_test.dart (which builds the theme) passes. Not verifiable
locally on 3.41.6 — CI covers that, and the reasoning above is why it should
be a no-op there.
Scope: this does NOT address the separate phosphor_flutter 2.1.0 breakage on
newer Flutter (PhosphorIconData extends IconData, now a final class), which
blocks widget tests independently of this file.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RrVjCqVDMANK5sa5eyjATw
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📝 WalkthroughWalkthroughThe theme configuration replaces a version-compatibility comment with a scoped ChangesTheme transition compatibility
Estimated code review effort: 2 (Simple) | ~5 minutes Merge Risk: 🟡 Moderate · up to The change restores analysis on Flutter 3.44.x but breaks the pinned Flutter 3.41.6 toolchain, causing the project’s analysis checks to fail there. The PR should not merge until the import works across supported SDKs or the SDK pin and workflows are updated together. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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ran the workflow on this (it was sitting on action_required, not actually failing) and it goes red on the pinned toolchain: so the "safe on BOTH toolchains" bit doesn't hold — on 3.41.6 cupertino.dart doesn't export it at all, material.dart does. the symbol MOVED rather than being re-exported from both, which means an unconditional import can only ever be right for one of the two. the problem you're describing is real though, i hit it locally: on a newer flutter this file fails to resolve and takes the surrounding const map down with it. so this wants solving, just not this way. to land it needs the CI pin moved to 3.44.x in the same PR, so the import and the toolchain agree. heads up if you go that route — bumping the pin also surfaces phosphor_flutter 2.1.0, which extends IconData and stops compiling once IconData became final. that's the other half of the same upgrade and it's the bigger half. leaving this open rather than closing it, the underlying issue stands. |
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Inline comments:
In `@lib/theme/theme.dart`:
- Around line 29-42: Update the CupertinoPageTransitionsBuilder import in
theme.dart to use the pinned Flutter 3.41.6-compatible source, material.dart,
and revise the surrounding compatibility comment accordingly. Keep the import
narrowly scoped to avoid collisions, and verify analysis against the supported
SDK/toolchain.
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📒 Files selected for processing (1)
lib/theme/theme.dart
…class
the import this PR added goes red on the pinned toolchain:
warning • The library 'package:flutter/cupertino.dart' doesn't export a member
with the shown name 'CupertinoPageTransitionsBuilder'
warning • Unused import: 'package:flutter/cupertino.dart'
the class MOVED rather than being re-exported by both. on 3.41.6 material.dart
has it and cupertino.dart does not; on 3.44.x it is the other way round. so no
unconditional import compiles on both, and picking either one just swaps which
toolchain breaks.
spreading PageTransitionsTheme's own default builders avoids naming it at all —
the SDK already maps iOS/macOS to whatever Cupertino builder that version ships,
so we override only android/fuchsia/linux/windows and inherit the rest. works on
both directions, and keeps the interactive edge-swipe-back that the explicit iOS
entry existed to preserve.
the map is no longer const (spreading a getter), which costs nothing here — it
is built once per theme.
note for whoever bumps the flutter pin: 3.44.x also breaks phosphor_flutter
2.1.0, which extends IconData and stops compiling now that IconData is final.
2.1.0 is the latest release, so that one has no upstream fix yet and is the real
blocker on moving the pin.
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@coderabbitai review reworked this — the original import went red on the pinned toolchain (cupertino.dart does not export CupertinoPageTransitionsBuilder on 3.41.6; the class moved rather than being re-exported by both). now spreading PageTransitionsTheme's default builders instead of naming the class, which compiles on both 3.41.6 and 3.44.x. would like a look at whether inheriting the SDK defaults could change iOS/macOS behaviour in a way the explicit entry did not. |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '--- changed files ---'
git diff --name-only HEAD^ HEAD 2>/dev/null || git diff --name-only
printf '%s\n' '--- PR diff for lib/theme/theme.dart ---'
git diff --unified=80 HEAD^ HEAD -- lib/theme/theme.dart 2>/dev/null || \
git diff --unified=80 -- lib/theme/theme.dart
printf '%s\n' '--- AST outline for lib/theme/theme.dart ---'
ast-grep outline lib/theme/theme.dart --items all --view expanded
printf '%s\n' '--- PageTransitionsTheme and builder references ---'
rg -n -C 6 \
-e '\bPageTransitionsTheme\b' \
-e '\bpageTransitionsTheme\b' \
-e '\bCupertinoPageTransitionsBuilder\b' \
lib test 2>/dev/null || true
printf '%s\n' '--- workflow Flutter pins ---'
fd -t f -e yml -e yaml .github 2>/dev/null | while IFS= read -r f; do
if rg -n -i -C 3 '(flutter-version|flutter version|3\.41\.6|3\.44)' "$f"; then
printf '%s\n' "--- $f ---"
fi
doneLength of output: 20826 🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '--- workflow files ---'
fd -t f -e yml -e yaml .github 2>/dev/null | sort
printf '%s\n' '--- Flutter version references in repository configuration ---'
rg -n -i -C 4 '(flutter-version|flutter version|3\.41\.6|3\.44\.6|sdk:)' \
.github pubspec.yaml README.md 2>/dev/null || true
printf '%s\n' '--- navigation test ---'
cat -n test/nav_back_swipe_test.dart
printf '%s\n' '--- custom page-transition builder ---'
ast-grep outline lib/theme/page_transitions.dart --items all --view expanded
cat -n lib/theme/page_transitions.dart
printf '%s\n' '--- transition-related test definitions ---'
rg -n -P -C 5 '^\s*(test|testWidgets)\s*\(' test libLength of output: 175589 🤖 web_search executed:
Length of output: 13509 🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '--- Flutter PageTransitionsTheme defaults by tag ---'
for tag in 3.41.6 3.44.6; do
printf '%s\n' "--- $tag ---"
curl --fail --silent --show-error \
"https://raw.githubusercontent.com/flutter/flutter/${tag}/packages/flutter/lib/src/material/page_transitions_theme.dart" |
rg -n -A 35 -B 5 '_defaultBuilders|TargetPlatform\.(iOS|macOS)' | head -n 100
done
printf '%s\n' '--- focused navigation test ---'
cat -n test/nav_back_swipe_test.dart
printf '%s\n' '--- workflow file names and Flutter configuration ---'
fd -t f -e yml -e yaml .github 2>/dev/null | sort | while IFS= read -r f; do
printf '%s\n' "--- $f ---"
rg -n -i -C 3 '(flutter|3\.41|3\.44)' "$f" || true
done
printf '%s\n' '--- Dart SDK constraints ---'
rg -n -C 2 '^(environment:| sdk:)' pubspec.yamlLength of output: 13773
For Flutter 3.41.6 and Flutter 3.44.6,
The only intentional semantic change is for a future Flutter SDK that changes its Apple default builder. This implementation will adopt that new SDK default. That is consistent with the stated compatibility goal.
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coderabbit flagged the import against the pinned toolchain and it was right about that — but its suggestion (point the import at material.dart instead) only moves the breakage: that is correct on 3.41.6 and fails on 3.44.x, which is the case this PR opened for. the review is anchored to 906618e, the original commit, not the current head. current head does not import the class from either library. it spreads PageTransitionsTheme's default builders and overrides only android/fuchsia/linux/windows, so iOS/macOS inherit whatever that SDK version ships and nothing here names the symbol that moved. verified both directions: analyze clean locally on 3.44.9, and CI green on the pinned 3.41.6. that pair is the actual test — either import alone can only pass one of them. merging. |
3 participants
Not a CI break — a "current stable" break
CI is pinned to Flutter 3.41.6, where
material.dartre-exportsCupertinoPageTransitionsBuilder. On the pin this file is fine andmainis green.On 3.44.x that re-export is gone, and
flutter analyzereports 5 errors in afile the contributor never touched:
One missing symbol, then four knock-on errors as the surrounding
const PageTransitionsThememap loses its constant value.The fix is the one this file already wrote down
theme.dartpredicted this precisely and left the remedy in a comment:This PR takes that import instead of leaving it as an instruction, so the file no
longer depends on which library happens to re-export the symbol in a given release.
The comment above it is updated to explain why the import is now unconditional.
Why this is safe on the pinned toolchain too
material.dartre-exports the same declaration. Dart reports an ambiguity onlywhen two different declarations share a name, so on 3.41.6 the analyzer simply
sees one element reachable by two routes — not a conflict.
showclause is load-bearing. An unscopedimport 'package:flutter/cupertino.dart';would collide with material, which declares its own
Card,Switch,Dividerandothers. Only the one symbol is pulled in.
Verification
On Flutter 3.44.6:
flutter analyze lib/— 5 errors → cleanflutter test test/boot_splash_test.dart(builds the theme) — 4 passedI could not test on 3.41.6 locally; CI covers that, and the reasoning above is why it
should be a no-op there. If CI disagrees I'd rather find out on this one-line change
than inside a feature PR.
Out of scope
This does not fix the separate
phosphor_flutter2.1.0 breakage on newer Flutter —class PhosphorIconData extends IconDatafails now thatIconDataisfinal, whichblocks widget tests independently of this file. That needs a dependency bump and is a
different change; flagging it since it is the other thing a contributor on current
stable will hit immediately.
Summary by CodeRabbit