TableBorder constructor Null safety

Implementation

const factory TableBorder({
  @Default(BorderSide.none) BorderSide top,
  @Default(BorderSide.none) BorderSide right,
  @Default(BorderSide.none) BorderSide bottom,
  @Default(BorderSide.none) BorderSide left,
  @Default(BorderSide.none) BorderSide horizontalInside,
  @Default(BorderSide.none) BorderSide verticalInside,
  @Default(BorderRadius.zero) BorderRadius borderRadius,
}) = _TableBorder;