# RefGraph.neighborsDirected

Get directed neighbors of a node.

## Signatures

```ts
export declare const neighborsDirected: {
    (nodeIndex: Graph.NodeIndex, direction: Graph.Direction): <N, E, Err, R>(ref: RefGraph<N, E, "directed", Err, R>) => RefSubject.Computed<Array<Graph.NodeIndex>, Err, R>;
    <N, E, Err, R>(ref: RefGraph<N, E, "directed", Err, R>, nodeIndex: Graph.NodeIndex, direction: Graph.Direction): RefSubject.Computed<Array<Graph.NodeIndex>, Err, R>;
};
```

## Why

Get directed neighbors of a node. The operation remains attached to the RefSubject's versioned
state boundary.

## Ownership and lifetime

The neighbors directed view retains no independent state. An Effect read samples the source
once; Fx observation follows later pushes and its observing Scope owns subscription cleanup.