addPanelButton function Null safety

dynamic addPanelButton(
  1. String label,
  2. {dynamic iconData,
  3. required dynamic onPressed(
      )}
    )

    Implementation

    Widget addPanelButton(
  final String label, {
  final IconData? iconData,
  required final Function() onPressed,
}) =>
    SizedBox(
      width: double.infinity,
      child: ElevatedButton.icon(
        icon: Icon(iconData ?? Icons.add),
        style: ButtonStyle(
          shape: MaterialStateProperty.all<RoundedRectangleBorder>(
            const RoundedRectangleBorder(
              borderRadius: ROUNDED_BORDER_RADIUS,
            ),
          ),
        ),
        label: Text(label),
        onPressed: onPressed,
      ),
    );