Dart

Dart code, its tools and its packages, for pure Dart and for the Dart inside a Flutter app. A package's language version is the lower bound of environment.sdk in its pubspec.yaml, not the SDK binary you run, and that one value decides which features compile (patterns need 3.0, dot shorthands 3.10, primary constructors 3.13), which breaking changes apply and how dart format lays out the code. Current stable is 3.13.5 (2026-09-29). Widgets, Flutter testing, builds and app releases are in flutter SKILL.md.

Apply only the routes and checks for the selected job. Read a linked skill's named file from its installed folder when available, or from the linked source. Report an unavailable required reference instead of inventing it. [skill-authoring, DISTRIBUTION.md#composing-skills]