export declare namespace MonitorEngine {
    enum State {
        START = 0,
        PAUSE = 1,
        STOP = 2
    }
    interface StartOptions {
        dueTime?: number | Date;
        period?: number;
    }
    type EventType = 'START' | 'STOP' | 'PAUSE' | 'READ_ERROR' | 'READ_SUCCESS';
    interface Event<PayloadType = any> {
        type: EventType;
        payload: PayloadType;
    }
    interface VariableMonitoringUpdate<DataType> {
        update(totalMs: number): Promise<DataType>;
    }
}
export interface MonitorEngineInterface {
    start(options?: MonitorEngine.StartOptions): this;
    /**
     * Stop monitoring
     * It will terminates values and event streams (complete will be called on your subsriptions)
     */
    stop(): this;
    /**
     * Pause monitoring
     */
    pause(): this;
}