Function neighborsDirected

packages/effect/src/Graph.ts:1543–1570

(
  graph: Graph<N, E, T> | MutableGraph<N, E, T>,
  nodeIndex: NodeIndex,
  direction: Direction
)

 * @category queries
 */
export const neighborsDirected = <N, E, T extends Kind = "directed">(
  graph: Graph<N, E, T> | MutableGraph<N, E, T>,
  nodeIndex: NodeIndex,
  direction: Direction
): Array<NodeIndex> => {
  const adjacencyMap = direction === "incoming"
    ? graph.reverseAdjacency
    : graph.adjacency

  const adjacencyList = adjacencyMap.get(nodeIndex)
  if (adjacencyList === undefined) {
    return []
  }

  const result: Array<NodeIndex> = []
  for (const edgeIndex of adjacencyList) {
    const edge = graph.edges.get(edgeIndex)
    if (edge !== undefined) {
      // For incoming direction, we want the source node instead of target
      const neighborNode = direction === "incoming"
        ? edge.source
        : edge.target
      result.push(neighborNode)
    }
  }

  return result
}

// =============================================================================
// GraphViz Export