BundleConfiguration is currently not pub useed (exported), so it is not exposed to the darklua_core library. Because of this, it seems inefficient because it can only be deserialized to Configuration as a string data type, like toml::from_str("bundle = { require_mode = 'path' }").unwrap().

If BundleConfiguration is exposed and accessible from external crates, it can be used like this:

let mut config = Configuration::empty();
if bundle {
    config = config.with_bundle_configuration(BundleConfiguration::new(
        BundleRequireMode::default(),
    ));
}
config = config.with_generator(GeneratorParameters::RetainLines);