xterm.dart/lib/buffer/cell_flags.dart

abstract class CellFlags {
  static const bold = 1 << 0;
  static const faint = 1 << 1;
  static const italic = 1 << 2;
  static const underline = 1 << 3;
  static const blink = 1 << 4;
  static const inverse = 1 << 5;
  static const invisible = 1 << 6;

  /// whether the cell required two cells.
  static const wide = 1 << 8;
}