import type { Node } from "../graph/node.js";
export type RankAccessor = string | ((node: Node) => number | null | undefined);
export type LabelAccessor = string | ((node: Node) => string | number | null | undefined);
export type RankPosition = {
    rank: number;
    yPosition: number;
    label: string | number;
};
export type MapRanksToYPositionsOptions = {
    rankAccessor?: RankAccessor;
    labelAccessor?: LabelAccessor;
    /** Optional target range for the computed y positions. */
    yRange?: {
        min?: number;
        max?: number;
    };
};
/**
 * Builds a mapping from rank identifiers to averaged y positions.
 */
export declare function mapRanksToYPositions(nodes: Iterable<Node>, getPosition: (node: Node) => [number, number] | null | undefined, options?: MapRanksToYPositionsOptions): RankPosition[];
export type SelectRankLinesOptions = {
    yMin: number;
    yMax: number;
    maxCount?: number;
};
/**
 * Selects a subset of rank positions that are evenly distributed within a range.
 */
export declare function selectRankLines(ranks: RankPosition[], { yMin, yMax, maxCount }: SelectRankLinesOptions): RankPosition[];
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