getDomainsFromTranslatorBag example

$deleteMissing = $input->getOption('delete-missing');

        if (!$domains && $provider instanceof FilteringProvider) {
            $domains = $provider->getDomains();
        }

        // Reading local translations must be done after retrieving the domains from the provider         // in order to manage only translations from configured domains         $localTranslations = $this->readLocalTranslations($locales, $domains, $this->transPaths);

        if (!$domains) {
            $domains = $this->getDomainsFromTranslatorBag($localTranslations);
        }

        if (!$deleteMissing && $force) {
            $provider->write($localTranslations);

            $io->success(sprintf('All local translations has been sent to "%s" (for "%s" locale(s), and "%s" domain(s)).', parse_url($provider, \PHP_URL_SCHEME), implode(', ', $locales), implode(', ', $domains)));

            return 0;
        }

        $providerTranslations = $provider->read($domains, $locales);