How to use the cldr.extractTerritoryDisplayNames function in cldr

const extractCountryDataForLocale = locale => {
  const countryNames = cldr.extractTerritoryDisplayNames(locale);
  // We only support ISO 3166-1 country code (https://en.wikipedia.org/wiki/ISO_3166-1)
  // there is alpha-2 (two-letter) , alpha-3 (three-letter) , and numeric (three-digit) representation
  // that's why we escape the non-supported representations
  // That's the lib used by the backend https://github.com/TakahikoKawasaki/nv-i18n/blob/master/src/main/java/com/neovisionaries/i18n/CountryCode.java#L2507-L2536
  const numberRegex = /^\d+$/;

  // filter out continents and invalid countries
  Object.keys(countryNames).forEach(key => {
    if (
      numberRegex.test(key) ||
      key.length > 3 ||
      excludedCountries.includes(key)
    )
      delete countryNames[key];
  });