/**
 * Shell layout algorithm
 */
import { Graph, Node, PositionMap } from "../../types";
/**
 * Position nodes in concentric circles.
 * @param G - Graph or list of nodes
 * @param nlist - List of node lists for each shell
 * @param scale - Scale factor for positions
 * @param center - Coordinate pair around which to center the layout
 * @param dim - Dimension of layout (currently only supports dim=2)
 * @returns Positions dictionary keyed by node
 */
export declare function shellLayout(G: Graph, nlist?: Node[][] | null, scale?: number, center?: number[] | null, dim?: number): PositionMap;
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