import { type XYPosition } from '@xyflow/system';
import type { Edge, Node } from '../types';
/**
 * Test whether an object is usable as a Node
 * @public
 * @remarks In TypeScript this is a type guard that will narrow the type of whatever you pass in to Node if it returns true
 * @param element - The element to test
 * @returns A boolean indicating whether the element is an Node
 */
export declare const isNode: <NodeType extends Node = Node>(element: unknown) => element is NodeType;
/**
 * Test whether an object is usable as an Edge
 * @public
 * @remarks In TypeScript this is a type guard that will narrow the type of whatever you pass in to Edge if it returns true
 * @param element - The element to test
 * @returns A boolean indicating whether the element is an Edge
 */
export declare const isEdge: <EdgeType extends Edge = Edge>(element: unknown) => element is EdgeType;
export declare function toPxString(value: number | undefined): string | undefined;
export * from './edges';
export declare const arrowKeyDiffs: Record<string, XYPosition>;