import type { Article } from './service';
interface IStatistic {
    value: number;
    stacks: Set<string>;
}
export declare class Statistic extends Map<number, IStatistic> {
    private readonly root;
    private readonly expire;
    private timer;
    constructor(root: Article);
    get total(): number;
    increase(id: number, ...hashes: string[]): void;
    flush(): Promise<void>;
    initialize(): void;
    terminate(): Promise<void | import("winston").Logger>;
}
export {};