export interface GraphNode {
    id: string;
    type: 'pr' | 'file' | 'author';
    attributes: Record<string, any>;
}
export interface GraphEdge {
    source: string;
    target: string;
    relation: 'touches' | 'authored' | 'duplicate_of' | 'related_to' | 'reviewed' | 'commented';
    weight?: number;
    timestamp?: number;
}
export declare class KnowledgeGraph {
    private nodes;
    private edges;
    /** Fast O(1) edge dedup index: "source|target|relation" → index in edges array */
    private edgeIndex;
    private edgeKey;
    /**
     * Clear the graph
     */
    clear(): void;
    /**
     * Add a node to the graph
     */
    addNode(node: GraphNode): void;
    /**
     * Retrieve a node
     */
    getNode(id: string): GraphNode | undefined;
    /**
     * Add an edge between two nodes
     */
    addEdge(edge: GraphEdge): void;
    /**
     * High-level method to ingest a PR into the graph
     */
    addPR(prId: string | number, title: string, author: string, files: string[], originalPrId?: string | number): void;
    /**
     * Add an explicit expertise link (e.g. from parsing review comments)
     */
    addReviewer(prId: string | number, reviewerId: string, isApproval?: boolean): void;
    /**
     * Export the entire graph topology for visualization (Dashboard Phase 7)
     */
    export(): {
        nodes: GraphNode[];
        edges: GraphEdge[];
    };
    /**
     * Calculate Bus Factor for a specific file or directory
     * Returns the number of distinct developers who have meaningfully contributed
     * to this file within the last year.
     */
    calculateBusFactor(path: string): number;
    /**
     * Find True Expertise for a file.
     * Weighs Authorship (10pts) vs Approvals (5pts) vs Comments (2pts).
     * Time decay: Older interactions are worth less.
     */
    getTrueExpertise(path: string): Array<{
        author: string;
        score: number;
    }>;
    /**
     * General query method to find adjacent nodes of a specific type or relation
     */
    query(startId: string, targetType?: 'pr' | 'file' | 'author', relationFilter?: GraphEdge['relation']): GraphNode[];
    /**
     * Shortcut: Get all PRs that touched this file
     */
    getFileHistory(filepath: string): GraphNode[];
    /**
     * Shortcut: Get all files/PRs authored by this user
     */
    getAuthorHistory(username: string): GraphNode[];
    exportJSON(): string;
    importJSON(jsonString: string): void;
}
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