src/helpers/i18n-helpers.js


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export function getLocale({ locale, locales, defaultLocale, fallbackLocale }) {
  let localeStr = locale;
  if (locales[locale] === undefined) {
    let localeFuzzy;
    Object.keys(locales).forEach((localStr) => {
      if (locales && Object.hasOwnProperty.call(locales, localStr)) {
        if (locale.substring(0, 2) === localStr.substring(0, 2)) {
          localeFuzzy = localStr;
        }
      }
    });

    if (localeFuzzy !== undefined) {
      localeStr = localeFuzzy;
    } 
  }

  if (locales[localeStr] === undefined) {
    localeStr = defaultLocale;
  }

  if (!localeStr) {
    localeStr = fallbackLocale;
  }

  return localeStr;
}