import type { KnowledgeGraph } from '../contracts/graph.js';
export type TimeTravelView = 'summary' | 'risk' | 'drift' | 'timeline';
export interface TimeTravelResult {
    fromRef: string;
    toRef: string;
    view: TimeTravelView;
    summary: {
        headline: string;
        whyItMatters: string[];
    };
    changed: {
        nodesAdded: number;
        nodesRemoved: number;
        edgesAdded: number;
        edgesRemoved: number;
        communities: Array<{
            community: number;
            changeCount: number;
        }>;
    };
    risk: {
        topImpacts: Array<{
            label: string;
            transitiveDependents: number;
        }>;
    };
    drift: {
        movedNodes: Array<{
            label: string;
            fromCommunity: number | null;
            toCommunity: number | null;
        }>;
    };
    timeline: {
        events: Array<{
            kind: string;
            label: string;
            reason: string;
        }>;
    };
}
export interface CompareTimeTravelGraphsOptions {
    fromRef?: string;
    toRef?: string;
    view?: TimeTravelView;
    limit?: number;
    depth?: number;
    edgeTypes?: string[];
}
export declare function compareTimeTravelGraphs(beforeGraph: KnowledgeGraph, afterGraph: KnowledgeGraph, options?: CompareTimeTravelGraphsOptions): TimeTravelResult;
export declare function formatTimeTravelResult(result: TimeTravelResult): string;