Function resolveLocaleCode

packages/spec/src/locales.ts:271–287

(value: string)

 * @throws {Error} If the provided locale code is invalid.
 */
export const resolveLocaleCode = (value: string): LocaleCodeFull => {
  const existingFullLocaleCode = Object.values(localeMap)
    .flat()
    .includes(value as any);
  if (existingFullLocaleCode) {
    return value as LocaleCodeFull;
  }

  const existingShortLocaleCode = Object.keys(localeMap).includes(value);
  if (existingShortLocaleCode) {
    const correspondingFullLocales = localeMap[value as LocaleCodeShort];
    const fallbackFullLocale = correspondingFullLocales[0];
    return fallbackFullLocale;
  }

  throw new Error(`Invalid locale code: ${value}`);
};

/**
 * Determines the delimiter used in a locale code