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prefer-const-border-radius

added in: 1.6.0
warning
🛠
Free+

Suggests replacing the BorderRadius.circular constructor with the const BorderRadius.all constructor.

BorderRadius.circular constructor calls const BorderRadius.all constructor under the hood and can be safely replaced by it.

Example​

❌ Bad:

// LINT: Prefer 'const BorderRadius.all' to non-const constructors.
final _defaultFinalRadius = BorderRadius.circular(8);

class RoundedWidget extends StatelessWidget {
  final BorderRadius borderRadius;
  final Widget child;

  const RoundedWidget({
    Key? key,
    this.borderRadius = _defaultRadius,
    required this.child,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return ClipRRect(
      borderRadius: borderRadius,
      child: child,
    );
  }
}

✅ Good:

const _defaultRadius = BorderRadius.all(Radius.circular(8));

class RoundedWidget extends StatelessWidget {
  final BorderRadius borderRadius;
  final Widget child;

  const RoundedWidget({
    Key? key,
    this.borderRadius = _defaultRadius,
    required this.child,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return ClipRRect(
      borderRadius: borderRadius,
      child: child,
    );
  }
}