in lib/src/crawl_async.dart [32:38]
Stream<V> crawlAsync<K extends Object, V>(
Iterable<K> roots,
FutureOr<V> Function(K) readNode,
FutureOr<Iterable<K>> Function(K, V) edges) {
final crawl = _CrawlAsync(roots, readNode, edges)..run();
return crawl.result.stream;
}