BoxShadow constructor Null safety
Implementation
const factory BoxShadow(
    {final Color color,
    final Offset offset,
    final double blurRadius,
    final double spreadRadius,
    final BlurStyle blurStyle}) = _$BoxShadow;const factory BoxShadow(
    {final Color color,
    final Offset offset,
    final double blurRadius,
    final double spreadRadius,
    final BlurStyle blurStyle}) = _$BoxShadow;