After upgrading Flutter to version 3.29.0 and Dart to version 3.7.0, I started seeing the following warning in the console when running my app on both Android and iOS:
Synthetic package output (package:flutter_gen) is deprecated: https://flutter.dev/to/flutter-gen-deprecation.
In a future release, synthetic-package will default tofalseand will later be removed entirely.
In pubspec.yaml
flutter:
generate: true
What I've tried so far:
✅ Running flutter clean and flutter pub get.
✅ Upgrading all dependencies to the latest versions.
✅ Searching for a flutter_gen.yaml file in my project, but I don’t have one.
Questions: How can I properly update my project to avoid this warning?
Do I need to manually create a flutter_gen.yaml file to configure synthetic-package: false? If so, where should it be placed?
Is there an official migration path to handle the removal of synthetic-package for flutter_gen?
How to Update Your Project:
The migration guide provide two ways to migrate the project.
Modify Your l10n.yaml File: Set synthetic-package: false to stop using the virtual package.
Here's an example of what your l10n.yaml might look like:
synthetic-package: false
# The files are generated into the path specified by `arb-dir`
arb-dir: lib/i18n
# Or, specifically provide an output path:
output-dir: lib/src/generated/i18n
flutter config --explicit-package-dependencies
More details about migration guide can be found on this page. https://docs.flutter.dev/release/breaking-changes/flutter-generate-i10n-source#migration-guide
and this is not yet released in stable version don't know why are you getting this in
v3.29.0