Arcanedev\Localization\Utilities\LocalesManager::isDefaultLocaleSupported PHP Метод

    public function isDefaultLocaleSupported($defaultLocale)
    {
        if (!$this->isSupportedLocale($defaultLocale)) {
            throw new UnsupportedLocaleException("Laravel default locale [{$defaultLocale}] is not in the `supported-locales` array.");
        }
    }