[PiotrRogulski]

Moves the package, the example app, the docs bundle and the landing page to leancode_lint 28, with its rules running as an analyzer plugin.

Package and example

• leancode_lint 28 needs Dart 3.13, but it is only a dev dependency, so consumers are unaffected: the package still supports Dart 3.3 / Flutter 3.19.
• analysis_options.yaml enables the leancode_lint plugin with cognitive_complexity on. The example has the same setup.
• prefer_dot_shorthand stays off: the rule does not check the language version, and dot shorthands need Dart 3.10.
• unsafe_variance is ignored: the controllers hold callbacks over their value type (validators, getValueSetter(), builders), so they are invariant in it by design, and satisfying the rule would change the public API.
• Fixed the new findings: catch parameter names in lib/ (internal only), unneeded async in tests and the example, comments without a leading space in the example.

CI

• flutter analyze leaves out analyzer-plugin diagnostics, so CI now runs dart analyze --fatal-infos. It also checks formatting.
• The main job, the publish job and .fvmrc move to Flutter 3.47.8 (Dart 3.13). flutter pub publish resolves dev dependencies too, so publishing needs it.
• A new job runs the package tests on Flutter 3.19.6, the lower bound in pubspec.yaml, with leancode_lint dropped. It uses dart pub get --no-example and flutter test --no-pub; the flutter variants still touch example/ and fail.
• ⚠️ The job names change: "Flutter 3.29.x" becomes "Test and analyze", plus the new "Test on Flutter 3.19 (lower bound)". If branch protection requires the old name, it needs updating.

Docs bundle (docs_app/flutter)

• Flutter 3.47.8 in docs.yml. It already includes Dart 3.13, so the separate Dart setup is removed. Analysis switches to dart analyze --fatal-infos.
• The example generator (docs_app/scripts/flutter-examples.mjs) writes package imports in the registry, in dart format layout. The prelude ignores unnecessary_ignore next to unused_import, since most snippets use all three imports.
• unsafe_variance is ignored for the Docs* field widgets, for the same reason as in the package. islandTheme ignores cognitive_complexity: its score comes from flat light/dark choices, not nesting.

Landing page

• jaspr, jaspr_builder and jaspr_cli come from commit 9311973c of jaspr's next branch, whose builder supports analyzer 13 and newer. That removes the analyzer-12 caps on build_runner, build_web_compilers and dart_style, and the analyzer override. The commit is pinned in pubspec.yaml, analysis_options.yaml, docs.yml and README.md. Go back to version constraints once jaspr publishes a release with it.
• jaspr_lints runs next to leancode_lint. prefer_dot_shorthand is on, since the landing page is on Dart 3.10+. All findings are fixed.
• The rendered index.html only differs from before in the attribute order on the source-tab radio inputs. landing.js is identical.

Verified locally

• Package: dart analyze --fatal-infos and formatting clean; package and example tests pass on 3.47.8. The package tests (285) also pass on 3.19.6 with leancode_lint dropped.
• Docs: every step of the docs job passes, including npm run build.

---

Generated by Claude Code

[github-actions]

Docs preview: https://advanced-forms-fz6scek2d-leancode.vercel.app

Built from bed274f; the landing page is at /, the docs under /docs.