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avoid-stateless-widget-initialized-fields

added in: 1.5.0
warning
Pro+

Warns when a StatelessWidget has an initialized final field.

Non-static initialized fields are usually a sign of a state. Consider converting the widget to StatefulWidget.

note

You can fix this rule's issues using the "Convert to StatefulWidget" assist.

Example​

❌ Bad:

class AnotherWidget extends StatelessWidget {
  // LINT: Avoid initialized fields in a 'StatelessWidget'. Try converting this widget to a 'StatefulWidget' instead.
  final initialized = <String>{};

  // LINT: Avoid initialized fields in a 'StatelessWidget'. Try converting this widget to a 'StatefulWidget' instead.
  late final someField = <String>{};
}

✅ Good:

class AnotherWidget extends StatelessWidget {
  static final initialized = <String>{};

  final someField;

  const AnotherWidget(this.someField);
}

// Or

class _AnotherWidgetState extends State<AnotherWidget> {
  final initialized = <String>{};

  late final someField = <String>{};
}