/**
 * GraphReducer - Transforms event log into graph snapshot
 *
 * Implements a fold operation over the append-only event log
 * to produce the current state of the graph.
 *
 * All operations are pure and idempotent.
 */
import type { GraphEvent, GraphSnapshot, GraphStats } from '../../types/graph.js';
/**
 * Reduces an array of events into a snapshot
 *
 * @param events Array of graph events (must start with marker)
 * @param storeId Store identifier for snapshot metadata
 * @returns Result with snapshot or error
 */
export declare function reduceEventsToSnapshot(events: readonly GraphEvent[], storeId: string): {
    success: true;
    snapshot: GraphSnapshot;
} | {
    success: false;
    error: string;
};
/**
 * Parses JSONL content and reduces to snapshot
 *
 * @param jsonlContent Raw JSONL file content
 * @param storeId Store identifier
 * @returns Result with snapshot or error
 */
export declare function reduceJsonlToSnapshot(jsonlContent: string, storeId: string): {
    success: true;
    snapshot: GraphSnapshot;
} | {
    success: false;
    error: string;
};
/**
 * Calculates statistics from a snapshot
 */
export declare function calculateStats(snapshot: GraphSnapshot): GraphStats;
/**
 * Merges a new snapshot into an existing one
 * Useful for incremental updates without full rebuild
 */
export declare function mergeSnapshots(existing: GraphSnapshot, updates: GraphSnapshot): GraphSnapshot;
/**
 * Creates empty snapshot with just metadata
 */
export declare function createEmptySnapshot(storeId: string): GraphSnapshot;
/**
 * Filters snapshot by entity types
 */
export declare function filterByEntityTypes(snapshot: GraphSnapshot, entityTypes: readonly string[]): GraphSnapshot;
/**
 * Gets the line count from JSONL content
 */
export declare function getEventLineCount(jsonlContent: string): number;
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