addNewLine static method
Implementation
static void addNewLine({
required String filePath,
required String refLine,
required String newLine,
}) {
File file = File(filePath);
List<String> lines = file.readAsLinesSync();
final index = lines.lastIndexWhere((element) => element.contains(refLine));
lines.insert(index + 1, newLine);
file.writeAsStringSync(lines.join('\n'));
}