anchor.diff:  
   import 'a.dart'; // OK
   import 'a/b.dart'; // OK
  -
  +```
   ''';
   const _directiveSectionOrderedAlphabetically =
       'Sort directive sections alphabetically.';
  
positive.code: **DO** follow the conventions in the 
  [Effective Dart Guide](https://dart.dev/guides/language/effective-dart/style#ordering)
  
  **DO** place “dart:” imports before other imports.
  
  **BAD:**
  ```dart
  
negative.code: import 'package:foo/foo.dart';
  ```
  
  **DO** place `package:` imports before relative imports.
  
  **BAD:**
  ```dart
  