Directionality constructor Null safety

const Directionality(
  1. {Key? key,
  2. required TextDirection textDirection,
  3. required Widget child}

Creates a widget that determines the directionality of text and text-direction-sensitive render objects.

The textDirection and child arguments must not be null.


const Directionality({
  Key? key,
  required this.textDirection,
  required Widget child,
}) : assert(textDirection != null),
     assert(child != null),
     super(key: key, child: child);