import type { EdgeState } from "../core/constants.js";
import type { EdgeInterface, NodeInterface } from "./graph.js";
export interface EdgeOptions {
    /** the unique ID of the edge */
    id: string | number;
    /** the ID of the source node */
    sourceId: string | number;
    /** the ID of the target node */
    targetId: string | number;
    /** whether the edge is directed or not */
    directed?: boolean;
    /** origin data reference */
    data?: Record<string, unknown>;
}
/** Basic edge data structure */
export declare class Edge implements EdgeInterface {
    /** Unique uuid of the edge. */
    readonly id: string | number;
    /** ID of the source node. */
    private _sourceId;
    /** ID of the target node. */
    private _targetId;
    /** Whether the edge is directed or not. */
    private _directed;
    /** Origin data reference of the edge. */
    private _data;
    /** Check the type of the object when picking engine gets it. */
    readonly isEdge = true;
    /** Nodes at either end of this edge. */
    private readonly _connectedNodes;
    /** Edge state. */
    state: EdgeState;
    /**
     * The constructor
     * @param options.id - information about the edge
     */
    constructor({ id, sourceId, targetId, data, directed }: EdgeOptions);
    /**
     * Return the ID of the edge
     * @return {String|Number} - the ID of the edge.
     */
    getId(): string | number;
    /**
     * Return whether the edge is directed or not.
     * @return {Boolean} true if the edge is directed.
     */
    isDirected(): boolean;
    /**
     * Get the ID of the source node.
     * @return the ID of the source node.
     */
    getSourceNodeId(): string | number;
    /**
     * Get the ID of the target node.
     * @return the ID of the target node.
     */
    getTargetNodeId(): string | number;
    /**
     * Return of the value of the selected property key.
     * @param  key - property key.
     * @return - the value of the property.
     */
    getPropertyValue(key: string): unknown;
    /**
     * Set the origin data as a reference.
     * @param data - the origin data.
     */
    setData(data: Record<string, unknown>): void;
    /**
     * Update a data property.
     * @param key - the key of the property
     * @param value - the value of the property.
     */
    setDataProperty(key: string, value: unknown): void;
    /**
     * Set edge state
     * @param state - the new interaction state for the edge
     */
    setState(state: EdgeState): void;
    /**
     * Get edge state
     * @returns state - the current interaction state for the edge
     */
    getState(): EdgeState;
    addNode(node: NodeInterface): void;
    removeNode(node: NodeInterface): void;
    getConnectedNodes(): NodeInterface[];
}
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