import type { SankeyLayoutLink, SankeyLayoutNode } from '../types/sankey-internal.js';
interface ConnectedShapes {
    nodes: ReadonlySet<SankeyLayoutNode>;
    links: ReadonlySet<SankeyLayoutLink>;
}
/**
 * A resolved layout selection ready for connected-shape computation.
 *
 * - `node`: the clicked layout node (source/target links are already
 *   populated by d3-sankey).
 * - `link`: the clicked layout link with its endpoint nodes already resolved
 *   to objects by the caller; callers must guard with `isResolvedNode` before
 *   passing here so the function never needs to cast.
 */
type ResolvedShape = {
    type: 'node';
    node: SankeyLayoutNode;
} | {
    type: 'link';
    link: SankeyLayoutLink;
    source: SankeyLayoutNode;
    target: SankeyLayoutNode;
};
/**
 * Computes the 1-hop connected set for a resolved layout shape.
 *
 * - **Node**: the node, all of its direct source/target links, and the
 *   other-end nodes of those links. Does not traverse further hops.
 * - **Link**: the link and its two endpoint nodes.
 *
 * Handles isolated nodes (no `sourceLinks`/`targetLinks`) without throwing.
 */
export declare function findConnectedShapes(shape: ResolvedShape): ConnectedShapes;
export {};
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