Function getDirectedNeighbors

repos/effect/packages/effect/src/Graph.ts:1755–1778

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

  const impl = graphImpl(graph)
  const results: Array<EdgeIndex> = []
  for (const [edgeIndex, edgeData] of impl.edges) {
    if (predicate(edgeData.data, edgeData.source, edgeData.target)) {
      results.push(edgeIndex)
    }
  }
  return results
})

/**
 * Updates a single node's data by applying a transformation function.
 *
 * **Example** (Updating node data)
 *
 * ```ts import.meta.vitest
 * import { Graph, Option } from "effect"
 *
 * const graph = Graph.directed<string, number>((mutable) => {
 *   Graph.addNode(mutable, "Node A")
 *   Graph.addNode(mutable, "Node B")
 *   Graph.updateNode(mutable, 0, (data) => data.toUpperCase())
 * })
 *
 * Graph.getNode(graph, 0) // => Option.some("NODE A")
 * ```
 *
 * @category transforming
 * @since 3.18.0