Converter for room conversion in kotlin

NestedConverter

class NestedConverter {
    companion object {

        @TypeConverter
        @JvmStatic //needed
        fun stringToList(data: String?): List<NestedRepo> {
            if (data == null) {
                return emptyList()
            }
            val type = object : TypeToken<List<NestedRepo>>() {}.type
            return Gson().fromJson<List<NestedRepo>>(data, type)
        }

        @TypeConverter
        @JvmStatic //needed
        fun listToString(list: List<NestedRepo>): String {
            return Gson().toJson(list)
        }
    }
}