const TableBorder({BorderSide top: BorderSide.none, BorderSide right: BorderSide.none, BorderSide bottom: BorderSide.none, BorderSide left: BorderSide.none, BorderSide horizontalInside: BorderSide.none, BorderSide verticalInside: BorderSide.none })

Creates a border for a table.

All the sides of the border default to BorderSide.none.

Source 

const TableBorder({
  BorderSide top: BorderSide.none,
  BorderSide right: BorderSide.none,
  BorderSide bottom: BorderSide.none,
  BorderSide left: BorderSide.none,
  this.horizontalInside: BorderSide.none,
  this.verticalInside: BorderSide.none
}) : super(
  top: top,
  right: right,
  bottom: bottom,
  left: left
);