/**
 * Lightweight directed graph used for YAKE co-occurrence tracking.
 */
export declare class DirectedGraph {
    private readonly outgoing;
    private readonly incoming;
    addNode(id: number): void;
    hasEdge(source: number, target: number): boolean;
    incrementEdge(source: number, target: number, delta?: number): void;
    getWeight(source: number, target: number): number;
    outDegree(id: number): number;
    inDegree(id: number): number;
    outWeightSum(id: number): number;
    inWeightSum(id: number): number;
}
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