import { Graph, PointTuple } from '../types';
/**
 * Assign or only return the result for the graph who has no nodes or only one node.
 * @param graph original graph
 * @param assign whether assign result to original graph
 * @param center the layout center
 * @returns
 */
export declare const handleSingleNodeGraph: (graph: Graph, assign: boolean, center: PointTuple) => {
    nodes: any[];
    edges: import("@antv/graphlib").Edge<import("../types").EdgeData>[];
};