fix(ui): migrate to file_picker 12 - #2922
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe package migrates to Changesfile_picker 12 migration
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~15 minutes Change: Other Suggested reviewers: Merge Risk: ⚪ Minimal · up to The migration preserves nullable file selection and asynchronous conversion, while checked-in iOS consumers target iOS 15; no merge-blocking risk is established. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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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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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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Thanks for this — the win32 floor analysis and the AGP 9 diagnosis are both right, and switching to FilePicker.pickFile is the correct call rather than adapting .files.first.
Two asks inline. The first is the one that matters.
Use a range, not a caret. file_picker 13.1.0 is out, and 13.0.0 only removed the deprecated parameters this PR had already stopped passing. Every symbol the patched code touches — FilePicker.pickFile, windowsOptions/linuxOptions, readAsBytes(), name, path, FileType, FilePickerStatus — is unchanged across 12.0.0 and 13.1.0. (PlatformFile became an abstract base class in file_picker_platform_interface 4.0.0, but the surface used here is identical.) '>=12.0.0 <14.0.0' keeps your 12.x testing a valid resolution, lets apps already on 13 resolve, and avoids repeating the bump in a few weeks.
The async change on PlatformFileX is the right shape. To answer the deprecation path you offered in the description: keeping the sync pair working isn't possible. AttachmentFile asserts !CurrentPlatform.isWeb || bytes != null, and neither 12 nor 13 exposes bytes synchronously, so a sync bytes-less build throws on web and yields an attachment toMultipartFile() cannot upload.
The changelog entry is worth expanding with your own reasoning: anyone holding a PlatformFile obtained it from FilePicker.pickFiles(), whose return type changed in 12, so that call site is being rewritten regardless and the await costs nothing on top.
Optional, and not a blocker: the read could be skipped entirely on IO. All three internal consumers of file.bytes fall back to path (image_attachment_thumbnail.dart:147, extensions.dart:592, extensions.dart:707), so reading only on web would preserve what withData: false used to buy. It costs AttachmentFile.toMultipartFile's bytes fallback for unreadable paths, and it would invalidate the E2E run you already did.
The sample_app Gradle change is correct and correctly scoped — every packages/*/example/android/build.gradle already carries evaluationDependsOn(':app'), and only sample_app did not.
The CLA checkbox is still unticked.
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.
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.
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.
- Constrain file_picker to '>=12.0.0 <14.0.0' in melos.yaml and the
package pubspec; every symbol the handlers use is unchanged in 13.x.
- Deprecate withData and withReadStream on StreamAttachmentHandler.pickFile
(base, io, html) and on StreamFilePicker, which no longer forwards them.
- Add the changelog entries under Upcoming, including the breaking async
PlatformFileX change and the evaluationDependsOn(":app") note for apps
on pre-3.44 Android templates.
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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
file_picker12.Documentation