/**
 * A shape in the sankey graph area, stored as a stable identity so that
 * references survive layout recomputation on resize or data updates.
 * Resolution against the current layout happens at render time
 * in `getActiveConnectedSet`.
 *
 * - `node`: identified by the node id.
 * - `link`: identified by the source node id, the target node id, and the
 *   per-layout link index. All three are needed because parallel links
 *   (multiple links between the same node pair) share the same source and
 *   target ids but carry distinct indices assigned by the layout pass.
 */
export type SankeyShape = {
    type: 'node';
    nodeId: string;
} | {
    type: 'link';
    sourceId: string;
    targetId: string;
    linkIndex: number;
};
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