import WebSocket from 'ws';
import TaskManager, { type TaskStat } from '../TaskManager.js';
export declare function addStat(this: TaskManager, stat: TaskStat): void;
export declare function getStatsByOp(this: TaskManager, opId: string): TaskStat[];
export declare function getAllStats(this: TaskManager): TaskStat[];
export declare function queryStats(this: TaskManager, start?: number, end?: number, intervalMs?: number): TaskStat[];
export declare function getLatestStatPerOp(this: TaskManager, since: number): TaskStat[];
export declare function subscribeStats(this: TaskManager, ws: WebSocket, matcher: (stat: TaskStat) => boolean): void;
export declare function unsubscribeStats(this: TaskManager, ws: WebSocket): void;