orderedNodeConnections,
        /* predecessorCount= */ 0,
        /* successorCount= */ 0);
  }

  static <N, V> DirectedGraphConnections<N, V> ofImmutable(
      N thisNode, Iterable<EndpointPair<N>> incidentEdges, Function<N, V> successorNodeToValueFn) {
    checkNotNull(thisNode);
    checkNotNull(successorNodeToValueFn);