exist method Null safety

Future<bool?> exist(
  1. String package
)

Implementation

Future<bool?> exist(String package) async {
  Database database = await initDB();
  var result = await database
      .query("Button", where: "package_name = ?", whereArgs: [package]);
  if (result.isNotEmpty) {
    return true;
  } else {
    return false;
  }
}