Method is_installed

src/python/package_manager.cpp:488–501

    }

    bool PackageManager::is_installed(const std::string& package) const {
        const auto packages = list_installed();
        auto normalize = [](std::string s) {
            std::replace(s.begin(), s.end(), '-', '_');
            return s;
        };
        const auto normalized = normalize(package);

        for (const auto& pkg : packages) {
            if (pkg.name == package || normalize(pkg.name) == normalized)
                return true;
        }
        return false;
    }

    bool PackageManager::install_async(const std::string& package,
                                       UvRunner::OutputCallback on_output,