import type { NodeState } from "../core/constants.js";
import type { EdgeInterface, NodeInterface } from "./graph.js";
/** Properties for creating a new node */
export interface NodeOptions {
    /** the unique ID of the node */
    id: number | string;
    selectable?: boolean;
    highlightConnectedEdges?: boolean;
    data?: Record<string, unknown>;
}
/** Basic data structure of a node */
export declare class Node implements NodeInterface {
    readonly id: string | number;
    /** Keep a reference to origin data. */
    private _data;
    /** List edges. */
    private _connectedEdges;
    /** Interaction state of the node. */
    state: NodeState;
    /** Can the node be selected? */
    private _selectable;
    /** Should the state of this node affect the state of the connected edges? */
    private _highlightConnectedEdges;
    /** Check the type of the object when picking engine gets it. */
    readonly isNode = true;
    /**
     * The constructor of a node
     */
    constructor({ id, selectable, highlightConnectedEdges, data }: NodeOptions);
    /**
     * Return the ID of the node
     * @return - the ID of the node.
     */
    getId(): string | number;
    /**
     * Return the degree of the node -- includes in-degree and out-degree
     * @return {Number} - the degree of the node.
     */
    getDegree(): number;
    /**
     * Return the in-degree of the node.
     * @return - the in-degree of the node.
     */
    getInDegree(): number;
    /**
     * Return the out-degree of the node.
     * @return - the out-degree of the node.
     */
    getOutDegree(): number;
    /**
     * Return all the IDs of the sibling nodes.
     * @return [description]
     */
    getSiblingIds(): (string | number)[];
    /**
     * Return all the connected edges.
     * @return - an array of the connected edges.
     */
    getConnectedEdges(): EdgeInterface[];
    /**
     * Return of the value of the selected property key.
     * @param key - property key.
     * @return - the value of the property or undefined (not found).
     */
    getPropertyValue(key: string): unknown;
    /**
     * Set the new node data.
     * @param data - the new data of the node
     */
    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 node state
     * @param state - the new interaction state of the node
     */
    setState(state: NodeState): void;
    /**
     * Get node state
     * @returns state - the current interaction state of the node
     */
    getState(): NodeState;
    /**
     * Add connected edges to the node
     * @param edge an edge or an array of edges to be added to this._connectedEdges
     */
    addConnectedEdges(edge: EdgeInterface | EdgeInterface[]): void;
    /**
     * Remove edges from this._connectedEdges
     * @param edge an edge or an array of edges to be removed from this._connectedEdges
     */
    removeConnectedEdges(edge: EdgeInterface | EdgeInterface[]): void;
    /**
     * Clear this._connectedEdges
     */
    clearConnectedEdges(): void;
    isSelectable(): boolean;
    shouldHighlightConnectedEdges(): boolean;
}
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