CountryName class final

A class that represents the name of a country in a particular language.

The main difference to the super TranslatedName class is that the The official (fullName) must be provided and cannot be empty. The CountryName class is a simple value object that represents the name of a country in a particular language. It consists of a NaturalLanguage object that represents the language, and two String values that represent the official and common names of the country. The official and common fields must not be empty.

Example usage:

import 'package:sealed_countries/sealed_countries.dart';

void main() {
  const countryName = CountryName(
    language: LangSlk(),
    official: 'Slovenská republika',
    common: 'Slovensko',
  );
  assert(countryName.official == 'Slovenská republika');
  assert(countryName.common == 'Slovensko');
}