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dart-best-practices

Dart code quality conventions: naming, const/final/var hierarchy, single quotes, trailing commas, collection idioms, tear-offs, and import organization. Use only for Dart style-focused changes or reviews; never activate for configuration-only lint setup, unrelated feature work, or widget tests.

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  • SKILL.md1.9 KB
  • evals/evals.json3.2 KB

SKILL.md(原文)

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Dart Best Practices

Priority: P1 (HIGH)

  • Scoping:
  • No global variables.
  • Private globals (if required) must start with _.
  • Immutability: Use const > final > var.
  • Config: Use --dart-define for secrets. Never hardcode API keys.
  • Naming: Follow effective-dart (PascalCase classes, camelCase members).
  • Strings: Prefer single quotes; use double quotes only for interpolation needs.
  • Trailing Commas: Always use trailing commas for multi-line literals/params.
  • Expression Bodies: Prefer => for single-expression functions/getters.
  • Collections:
  • Use .map, .where, .fold, .any over manual loops when clarity improves.
  • Type empty collections (<String>[], <String, User>{}) to avoid dynamic.
  • Use collection if/for and spread operators for composable lists/maps.
  • Async: Always await futures unless intentionally fire-and-forget.
import 'models/user.dart'; // Good
import 'package:app/models/user.dart'; // Avoid local absolute

Anti-Patterns

  • No var for non-obvious types: Use final or explicit type; var only for locally-obvious short scopes.
  • No package imports within same package: Use relative imports for intra-package files.
  • No top-level mutable state: Encapsulate in class or inject via DI.
  • No anonymous lambdas for tear-offs: Prefer list.forEach(doSomething) over anonymous form.

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