import type { Graph, Node, PositionMap } from "../../types";
/**
 * Position nodes according to breadth-first search algorithm.
 * @param G - Graph
 * @param start - Starting node for bfs
 * @param align - The alignment of layers: 'vertical' or 'horizontal'
 * @param scale - Scale factor for positions
 * @param center - Coordinate pair around which to center the layout
 * @returns Positions dictionary keyed by node
 */
export declare function bfsLayout(G: Graph, start: Node, align?: "vertical" | "horizontal", scale?: number, center?: number[] | null): PositionMap;
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