/// <reference types="lodash" />
import { Emitter } from '../event-emitter';
interface Options {
    idleInterval?: number;
    checkIdleIntervalMs?: number;
    start?: boolean;
}
export declare class FocusTimer extends Emitter {
    private focusStart?;
    private lastFocusStart?;
    private isFocused;
    private idleInterval;
    private idleIntervalCheck;
    private checkIdleIntervalMs;
    private idleMediaTimer;
    private registered;
    private interacted;
    constructor(opts?: Options);
    startAutocapture: () => void;
    stopAutocapture: () => void;
    restart: () => void;
    private registerListeners;
    private unregisterListeners;
    private onBfCacheRestore;
    private startFocus;
    private endFocus;
    private onVisibilityChangeWrapper;
    checkIdleTime: () => void;
    get idleTime(): number;
    get currentFocusTime(): number;
    /**
     * This function is only exposed for testing, do not use it.
     */
    onBlur: () => void;
    onFocus: () => void;
    /**
     * This function is only exposed for testing, do not use it.
     */
    onVisibilityChange: (visibilityState: string) => void;
    /**
     * This function is only exposed for testing, do not use it.
     */
    pulse: import("lodash").DebouncedFunc<() => void>;
    checkMedia: () => void;
    clear(): void;
}
export {};