Function getLanguageCodesFromString

src/service/localization/index.js:55–71

(languageCode)

 * @visibleForTesting
 */
export function getLanguageCodesFromString(languageCode) {
  if (!languageCode) {
    return ['en', FALLBACK_LANGUAGE_CODE];
  }
  const matches = languageCode.match(LANGUAGE_CODE_CHUNK_REGEX) || [];
  return matches.reduce(
    (fallbackLanguageCodeList, chunk, index) => {
      const fallbackLanguageCode = matches
        .slice(0, index + 1)
        .join('-')
        .toLowerCase();
      fallbackLanguageCodeList.unshift(fallbackLanguageCode);
      return fallbackLanguageCodeList;
    },
    [FALLBACK_LANGUAGE_CODE]
  );
}

/**
 * Localization service.