fix(ui): migrate to file_picker 12 - #2922
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file_picker 12 removed the eager PlatformFile.bytes/.size getters in favour of readAsBytes()/readAsByteStream(), and pickFiles() now returns List<PlatformFile> instead of a FilePickerResult wrapper. - PlatformFileX.toAttachmentFile becomes async, mirroring the XFileX extension that already sat directly below it in the same file. - Both attachment handlers use pickFile() (singular), which returns the PlatformFile? they already wanted instead of taking .files.first — that also removes a throw on an empty selection. - withData/withReadStream are no longer forwarded (deprecated in 12; the content is now read on demand) but stay in the public signature, so this is not a breaking change for callers.
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Pro Plus Run ID: 📒 Files selected for processing (1)
Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe package migrates to Changesfile_picker 12 migration
Message translation behavior
Sample Android configuration
Estimated code review effort: 2 (Simple) | ~15 minutes Merge Risk: 🔵 Low · up to The dependency migration preserves the existing attachment API but may affect consumers targeting iOS versions below 14.0. Merge is reasonable with explicit owner confirmation of the supported iOS floor. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In
`@packages/stream_chat_flutter/lib/src/attachment/handler/stream_attachment_handler_io.dart`:
- Around line 145-152: Update the FilePicker.pickFile call in the attachment
handler to pass WindowsOptions.lockParentWindow and
LinuxOptions.lockParentWindow using the handler’s lockParentWindow value,
preserving the default locked-parent behavior on desktop platforms.
In `@packages/stream_chat_flutter/pubspec.yaml`:
- Line 33: Update the workspace-level file_picker dependency constraint in
melos.yaml rather than editing the package-level pubspec.yaml entry, then run
melos bootstrap to propagate the change.
- Line 33: Update the iOS deployment target documented and configured for the
example to iOS 14 to match file_picker ^12.1.0, and update the corresponding
dependency entry in melos.yaml before bootstrapping. If iOS 12/13 support must
remain, instead pin file_picker to a compatible version.
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Configuration used: defaults
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📒 Files selected for processing (5)
packages/stream_chat_flutter/CHANGELOG.mdpackages/stream_chat_flutter/lib/src/attachment/handler/stream_attachment_handler_html.dartpackages/stream_chat_flutter/lib/src/attachment/handler/stream_attachment_handler_io.dartpackages/stream_chat_flutter/lib/src/utils/extensions.dartpackages/stream_chat_flutter/pubspec.yaml
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renefloor
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Aug 26, 2026
melos.yaml is the source of truth for dependency versions, so bootstrap rewrote the package manifest back to file_picker 11 and every job that runs it failed on `pickFile` and `readAsBytes` being undefined. Restores lockParentWindow through WindowsOptions/LinuxOptions, which is where file_picker 12 moved it, drops the migration commentary from the handlers, and calls the async extensions out as breaking in their own changelog section rather than inside the dependency note.
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #2922 +/- ##
==========================================
+ Coverage 73.98% 74.17% +0.18%
==========================================
Files 435 437 +2
Lines 28174 28375 +201
==========================================
+ Hits 20845 21047 +202
+ Misses 7329 7328 -1 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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file_picker 12 pulls in android_file_picker, whose build script reads the `flutter` Gradle extension at configuration time. The Flutter Gradle plugin only registers that extension on plugin projects while `:app` is being configured, and plugin projects evaluate first by default, so the Android build failed with "Extension with name 'flutter' does not exist". The current Flutter app template carries this same block; sample_app predates it. It goes after the existing subprojects block rather than inside it: forcing evaluation from there runs `:app` before its own afterEvaluate is registered, which Gradle rejects outright.
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Linear: FLU-
Github Issue: #2917 (partially — this removes
file_pickerfrom the list of plugins that apply KGP)CLA
Description of the pull request
Migrates
stream_chat_flutterfromfile_picker^11 to ^12.Why this matters beyond the version number
stream_chat_flutteris the only package in a typical dependency tree that constrainsfile_picker, andfile_picker11 is the last remaining declarer ofwin32 ^5that does not move —device_info_plus,package_info_plus,share_plus,flutter_secure_storage_windows,wakelock_plusandwin32_registryall requirewin32 ^6.0.1in their current releases.file_picker12 went federated and dropped itswin32dependency entirely, so this one constraint holds the whole floor down. In the app this was developed against, this change alone let 23 packages upgrade in a singlepub get.It also unblocks AGP 9.
file_picker11 guards its Kotlin plugin on the AGP major only:Under AGP 9 with
android.builtInKotlin=false— which is whatflutter createwrites on 3.47.1 — nothing applies a Kotlin plugin to it and its Kotlin is never compiled. The build then fails inGeneratedPluginRegistrant.javawithcannot find symbol: class FilePickerPlugin, a Java error that points nowhere near the cause.file_picker12's Android implementation (android_file_picker) reads the property and works in both modes.What changed
PlatformFileXbecomes asynchronous.file_picker12 removed the eagerly-loadedPlatformFile.bytesand.sizegetters in favour ofreadAsBytes()/readAsByteStream(). The new implementation mirrors theXFileXextension that already sits directly below it in the same file, so the shape is not new to this codebase.Both attachment handlers use
FilePicker.pickFile.pickFilesnow returnsList<PlatformFile>rather than a result wrapper. Rather than adapting.files.first, the handlers use the singularpickFile, which returns thePlatformFile?these methods already wanted. That also fixes a latent bug:result?.files.firstthrew on an empty selection instead of returningnull.Not a breaking change for callers.
StreamAttachmentHandler.pickFile's public signature is untouched.withData,withReadStreamandlockParentWindowremain parameters; they are simply no longer forwarded, sincefile_picker12 deprecated them in favour of on-demand reads — which is exactly whattoAttachmentFilenow does.FileTypeandFilePickerStatusare unchanged in 12, so no other call site needed touching.How this was tested
dart analyze libon the patched package: clean.flutter test test/src/attachment/attachment_handler_test.dart test/src/utils/extension_test.dart: 42 passing. These are the suites covering the changed paths. I did not run the full package suite to completion locally.dependency_overridesgit ref and exercised end to end:dart analyze --fatal-infosclean, 4720 unit/widget tests green, and a Maestro E2E suite (14 flows, three screen sizes) covering attachment picking on device. Built on Flutter 3.47.1 / Dart 3.13.1, AGP 9.3.2, Gradle 9.7.1, KGP 2.4.10 — a configuration that could not build at all before this change.Happy to adjust the approach if you would rather keep
pickFilesand adapt the list handling instead, or if the async change on a public extension needs a deprecation path.Screenshots / Videos
Not applicable — no user-visible or layout change; this is a dependency migration behind the existing attachment-picker API.
Summary by CodeRabbit
Bug Fixes
New Features