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Reland after #169357. Switch Flutter to use pub workspaces as a preparation to unpin selected packages. Assumptions: 1. No packages in this repository are published to pub.dev --> We can use `any` dependencies in most local pubspecs, as the global constraint defines the version. An exception are the packages used outside of this repo with an `sdk` dependency, namely `flutter_localizations`, `flutter_test`, and `flutter`. 2. The "universes" `{flutter_tools}` and `{flutter, flutter_localizations, flutter_goldens}` can use different packages versions, as they are not resolved together. --> We do not need to upgrade them in sync, we can first do one "universe", then the other. Based on these assumptions, we use https://github.com/mosuem/pubspec_merger.dart to merge all packages in the `flutter` universe into a top-level pub workspace. The `flutter` and `flutter_tools` workspaces being separate also ensures that changes to `flutter` will not inadvertently break `flutter_tools`, with not-so-nice consequences for our users which would be unable to run `flutter upgrade`. There is a third "top-level" pubspec besides `./pubspec.yaml` and `packages/flutter_tools/pubspec.yaml`, namely `packages/flutter_tools/.../widget_preview_scaffold/pubspec.yaml`. This is an artifact due to it living under `flutter_tools`, so it can't be part of the `./pubspec.yaml` workspace. Moving it would be a larger change, and out of the scope of this PR. This required a rewrite of the update-packages tool, but the main functionality stays the same, as well as the argument names, to ensure a seamless transition. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md |
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complex_layout
Scrolling benchmark
To run the scrolling benchmark on a device:
flutter drive --profile test_driver/scroll_perf.dart
Results should be in the file build/complex_layout_scroll_perf.timeline_summary.json.
More detailed logs should be in build/complex_layout_scroll_perf.timeline.json.
Startup benchmark
To measure startup time on a device:
flutter run --profile --trace-startup
The results should be in the logs.
Additional results should be in the file build/start_up_info.json.