import * as ThingTalk from 'thingtalk';
declare abstract class BaseTimer {
    private _stopped;
    private _queue;
    private _timeout;
    constructor();
    protected abstract _nextTimeout(): number;
    next(): Promise<IteratorResult<{
        __timestamp: number;
    }, void>>;
    end(): void;
    stop(): void;
    private _reschedule;
    start(): void;
}
declare class Timer extends BaseTimer {
    private _base;
    private _interval;
    private _frequency;
    constructor(base: number, interval: number, frequency: number);
    toString(): string;
    private _setTimems;
    private _getTimems;
    private _setDay;
    private _splitDay;
    private _splitWeek;
    private _getEarliest;
    protected _nextTimeout(_now?: number | null): number;
}
declare class AtTimer extends BaseTimer {
    private _times;
    private _expiration_date;
    private _timezone;
    constructor(times: ThingTalk.Builtin.Time[], expiration_date: Date | null | undefined, timezone: string);
    toString(): string;
    protected _nextTimeout(): number;
}
declare class OnTimer extends BaseTimer {
    private _dates;
    constructor(dates: Date[]);
    toString(): string;
    protected _nextTimeout(_now?: number | null): number;
}
export { Timer, AtTimer, OnTimer };