/**
 * Data aggregation functions
 */
import type { DailyStats, MessageJson } from "./types.js";
export declare function aggregateByDate(messages: MessageJson[]): Map<string, DailyStats>;
export declare function filterByDays(dailyStats: Map<string, DailyStats>, days: number): Map<string, DailyStats>;
export declare function filterByDateRange(dailyStats: Map<string, DailyStats>, since?: string, until?: string): Map<string, DailyStats>;
export declare function aggregateByMonth(dailyStats: Map<string, DailyStats>): Map<string, DailyStats>;