export declare type GraphNode<Key, Payload> = {
    key: Key;
    payload: Payload;
    adjacents: Map<Key, number>;
};
/**
 * Indirect graph.
 * Allows multiple edges between a single pair of edges.
 */
export declare class Graph<Key, Payload> {
    readonly nodeMap: Map<Key, GraphNode<Key, Payload>>;
    readonly createDefault: (key: Key) => Payload;
    constructor(createDefault: (key: Key) => Payload);
    /**
     * Update key of given node.
     */
    upsert(key: Key, updater: (payload: Payload) => void): void;
    /**
     * Connect two edges.
     * Nodes must have already been inserted to this graph.
     */
    connect(key1: Key, key2: Key): void;
    /**
     * Returns an iterator of all nodes.
     */
    entries(): IterableIterator<[Key, GraphNode<Key, Payload>]>;
}
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