export declare class Watch {
    private m_interval;
    private m_maxDuration;
    private m_running_id;
    private m_timeout_id;
    private m_run_loop;
    private m_run_starttime;
    get interval(): number;
    set interval(val: number);
    get maxDuration(): number;
    set maxDuration(val: number);
    constructor(interval?: number, maxDuration?: number);
    start<R>(run: (m: Watch) => Promise<R> | R): Promise<R | null>;
    stop(): void;
    get running(): boolean;
}
export declare const Monitor: typeof Watch;