import { DiagramModel } from '../model/diagram-model';
import { DiagramLayout } from './diagram-layout';
/**
 * A layout which arranges the nodes in trees from left to right by depth relative to the nodes with most priority.
 * @public
 */
export declare class TreeLayout implements DiagramLayout {
    gapSize?: number;
    constructor(gapSize?: number);
    apply(model: DiagramModel): DiagramModel;
}