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The widget preview scaffold requires that previews are defined within importable libraries. Since Dart does not support absolute paths for imports or relative imports outside of the project, it's not possible for the widget previewer to display previews defined outside of `lib/`. This change updates the preview detector to ignore libraries that don't have a package name (e.g., libraries under `test/`) and updates `packageName` properties to not allow for null to make it clear that package names are required for previews. Fixes https://github.com/flutter/flutter/issues/178651
This directory contains tools and resources that the Flutter team uses during the development of the framework. The tools in this directory should not be necessary for developing Flutter applications, though of course, they may be interesting if you are curious.
The tests in this directory are run in the framework_tests_misc-*
shards.