ShaderMask constructor Null safety

const ShaderMask(
  1. {Key? key,
  2. required ShaderCallback shaderCallback,
  3. BlendMode blendMode = BlendMode.modulate,
  4. Widget? child}

Creates a widget that applies a mask generated by a Shader to its child.

The shaderCallback and blendMode arguments must not be null.


const ShaderMask({
  Key? key,
  required this.shaderCallback,
  this.blendMode = BlendMode.modulate,
  Widget? child,
}) : assert(shaderCallback != null),
     assert(blendMode != null),
     super(key: key, child: child);