ScrollableWidgetBuilder typedef Null safety
The signature of a method that provides a BuildContext and ScrollController for building a widget that may overflow the draggable Axis of the containing DraggableScrollableSheet.
Users should apply the scrollController to a ScrollView subclass, such
as a SingleChildScrollView, ListView or GridView, to have the whole
sheet be draggable.
Implementation
typedef ScrollableWidgetBuilder = Widget Function(
BuildContext context,
ScrollController scrollController,
);