[ Widget Preview ] Fix crash when @Preview annotations appeared outside of lib/#180768
Merged
auto-submit[bot] merged 5 commits intoJan 19, 2026
Merged
Conversation
…side of `lib/` 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 flutter#178651
Contributor
There was a problem hiding this comment.
Code Review
This pull request correctly fixes a crash that occurs when @Preview annotations are used outside of the lib/ directory. The approach of making packageName non-nullable and ignoring libraries without a package name is sound. The changes are consistent across the codebase, including templates, and a new test case has been added to verify the fix. I have one high-severity comment regarding a potential inconsistency in the test utilities that could lead to test failures.
jyameo
approved these changes
Jan 12, 2026
jyameo
left a comment
Contributor
There was a problem hiding this comment.
Overall lgtm! However seems there are some CI test failures, PTAL
Contributor
|
autosubmit label was removed for flutter/flutter/180768, because The base commit of the PR is older than 7 days and can not be merged. Please merge the latest changes from the main into this branch and resubmit the PR. |
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 20, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 20, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 20, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 20, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 20, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 21, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 21, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 21, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 22, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 22, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 22, 2026
…peared outside of `lib/` (flutter/flutter#180768)
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 23, 2026
…peared outside of `lib/` (flutter/flutter#180768)
flutter-zl
pushed a commit
to flutter-zl/flutter
that referenced
this pull request
Feb 10, 2026
…side of `lib/` (flutter#180768) 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 flutter#178651
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
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 updatespackageNameproperties to not allow for null to make it clear that package names are required for previews.Fixes #178651