interface XRange {
    readonly x0: number;
    readonly x1: number;
}
interface NodeWithDepth {
    readonly __depth?: number;
    /**
     * The visual column index from the align function (e.g. sankeyJustify). Used
     * as the map key when present so sink/source nodes repositioned by justify
     * don't corrupt the x-range of their assigned depth column.
     */
    readonly __layer?: number;
    readonly __x0?: number;
    readonly __x1?: number;
}
/**
 * Builds a map from visual column index to the x-range covering all nodes in
 * that column. Uses `__layer` as the key when available (the actual column
 * assigned by the align function), falling back to `__depth`. When multiple
 * nodes share the same column, the map stores the union of their x-extents.
 */
export declare function buildDepthToXRangeMap(nodes: ReadonlyArray<NodeWithDepth>): Map<number, XRange>;
/**
 * Returns the x-range for the given column depth index.
 *
 * - If the depth has layout nodes, returns their x-range directly.
 * - If the depth is within the range of known depths but has no nodes,
 *   linearly interpolates between the nearest known neighbors.
 * - If the depth falls outside [minDepth, maxDepth], returns `undefined`
 *   so the caller can silently skip it
 */
export declare function getXRangeForDepth(depth: number, depthToXRange: Map<number, XRange>, sortedDepths?: ReadonlyArray<number>): XRange | undefined;
export {};
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