import { DiagramModel } from '../model/diagram-model';
import { DiagramLayout } from './diagram-layout';
/**
 * A layout which arranges all the nodes in a horizontal line.
 * @public
 */
export declare class HorizontalLayout implements DiagramLayout {
    gapSize?: number;
    constructor(gapSize?: number);
    apply(model: DiagramModel): DiagramModel;
}