How to use the @angular-devkit/architect.BuilderProgressState.Error function in @angular-devkit/architect

id: update.id,
      builder: update.builder,
      target: update.target,
      status: update.status || '',
      name: (
        (update.target ? _targetStringFromTarget(update.target) : update.builder.name) +
        ' '.repeat(80)
      ).substr(0, 40),
    };

    if (update.status !== undefined) {
      data.status = update.status;
    }

    switch (update.state) {
      case BuilderProgressState.Error:
        data.status = 'Error: ' + update.error;
        bars.update(update.id, data);
        break;

      case BuilderProgressState.Stopped:
        data.status = 'Done.';
        bars.complete(update.id);
        bars.update(update.id, data, update.total, update.total);
        break;

      case BuilderProgressState.Waiting:
        bars.update(update.id, data);
        break;

      case BuilderProgressState.Running:
        bars.update(update.id, data, update.current, update.total);