backport graph module changes (#5660)

Co-authored-by: Mattia Manzati <[email protected]>

Author: 2 people

.changeset/good-regions-care.md

@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+Backport `Graph` module updates

packages/effect/src/Graph.ts

@@ -1493,11 +1493,6 @@ export const neighbors = <N, E, T extends Kind = "directed">(
   graph: Graph<N, E, T> | MutableGraph<N, E, T>,
   nodeIndex: NodeIndex
 ): Array<NodeIndex> => {
-  // For undirected graphs, use the specialized helper that returns the other endpoint
-  if (graph.type === "undirected") {
-    return getUndirectedNeighbors(graph as any, nodeIndex)
-  }
-
   const adjacencyList = graph.adjacency.get(nodeIndex)
   if (adjacencyList === undefined) {
     return []