prefer-widget-private-members

added in: 1.3.0

style

⚙️

Warns when a widget or widget state have public members (fields, methods, etc.).

⚙️ Config

Set ignore-static (default is false) to allow widgets to have static public members.

Set ignored-names (default is none) to ignore specific member names.

dart_code_metrics:
  ...
  rules:
    ...
    - prefer-widget-private-members:
        ignore-static: false
        ignored-names:
          - some
          - name

Example

❌ Bad:

class SomeStatefulWidget extends StatefulWidget {
  @override
  _someStatefulWidgetState createState() => _SomeStatefulWidgetState();
}

class _SomeStatefulWidgetState extends State<InspirationCard> {
  String _privateState;
  bool publicState; // LINT

  @override
  void initState() {
    super.initState();
  }

  void _somePrivateCallback() {}

  // LINT
  void somePublic() {}

  @override
  Widget build(BuildContext context) {
    return StatefulWidget();
  }
}

✅ Good:

class SomeStatefulWidget extends StatefulWidget {
  @override
  _someStatefulWidgetState createState() => _SomeStatefulWidgetState();
}

class _SomeStatefulWidgetState extends State<InspirationCard> {
  String _privateState;

  @override
  void initState() {
    super.initState();
  }

  void _somePrivateCallback() {}

  @override
  Widget build(BuildContext context) {
    return StatefulWidget();
  }
}