/**
 * Tuple representing an Edge between to Vertices
 *
 * @category Structures
 */
export type Edge<V> = [from: V, to: V];
/**
 * Port of Erlang's digraph
 * WIP
 *
 * @category Structures
 */
export declare class DirectedGraph<V, L = unknown> {
    private cyclical;
    private vertices;
    private edges;
    constructor(options?: {
        cyclical?: boolean;
    });
    /**
     * @group Vertices
     */
    addVertex(vertex: V): DirectedGraph<V, L>;
    /**
     * @group Vertices
     */
    deleteVertex(vertex: V): boolean;
    /**
     * @group Vertices
     */
    deleteVertices(vertices: V[]): boolean[];
    private inEdgesIterator;
    private outEdgesIterator;
    private edgesIterator;
    /**
     * Return all edges fora given vertex in an unspecified order
     *
     * @group Vertices
     * */
    getEdges(vertex: V): Edge<V>[];
    /**
     * @group Vertices
     */
    inDegree(vertex: V): number;
    /**
     * @group Vertices
     */
    outDegree(vertex: V): number;
    /**
     * @group Vertices
     */
    inNeighbors(vertex: V): V[];
    /**
     * @group Vertices
     */
    outNeighbors(vertex: V): V[];
    /**
     * @group Edges
     */
    addEdge(from: V, to: V): this;
    /**
     * @group Edges
     */
    deleteEdge(edge: Edge<V>): boolean;
    /**
     * @group Edges
     */
    deleteEdges(edges: Edge<V>[]): boolean[];
    /**
     * @group Edges
     */
    inEdges(vertex: V): Edge<V>[];
    /**
     * @group Edges
     */
    outEdges(vertex: V): Edge<V>[];
    /** return all vertices */
    /**
     * Returns number of vertices
     *
     * @group Helpers
     */
    numVertices(): number;
    /**
     * Returns number of edges
     *
     * @group Helpers
     */
    numEdges(): number;
    /**
     * If a simple cycle of length two or more exists through a vertex, the cycle is returned as a list [V, ..., V] of vertices.
     * If a loop through the vertex exists, the loop is returned as a list [V]. If no cycles exist, undefined is returned.
     *
     * @group Advanced
     */
    getCycle(vertex: V): V[] | undefined;
    /**
     * Tries to find an as short as possible simple cycle through a vertex.
     * Returns the cycle as a list [V, ..., V] of vertices, or undefined if no simple cycle exists.
     * Notice that a loop through the vertex is returned as list [V, V].
     *
     * @group Advanced
     */
    getShortCycle(vertex: V): V[] | undefined;
    /**
     * @group Advanced
     */
    getPath(from: V, to: V): V[] | undefined;
    /**
     * @group Advanced
     */
    getShortPath(from: V, to: V): V[] | undefined;
    /**
     * Delete all paths found between two vertices.
     * Returns false if not paths found, otherwise returns true
     *
     * @group Advanced
     */
    deletePath(from: V, to: V): boolean;
    /**
     * @group Advanced
     */
    components(): V[][];
    /**
     * Returns true if and only if the DirectedGraph is acyclic.
     *
     * @group Advanced
     */
    isAcyclic(): boolean;
    /**
     * Returns true if and only if the DirectedGraph is a tree.
     *
     * @group Advanced
     */
    isTree(): boolean;
    /**
     * @group Advanced
     */
    reachable(vertices: V[]): V[];
    /**
     * @group Advanced
     */
    reachableNeighbors(vertices: V[]): V[];
    /**
     * @group Advanced
     */
    postOrder(): V[];
    /**
     * @group Advanced
     */
    preOrder(): V[];
    /**
     * @group Advanced
     */
    topsort(): V[];
    /**
     * TODO: find a better name
     * TODO: look into optimizing this for javascript
     */
    private onePath;
    private shortPath;
    private followPath;
    private postGenerate;
}