/**
 * This provides window focus tracking functionality to aid
 * in anti-cheat measures.
 */
declare class FocusTracker {
    hasFocus: boolean;
    lastFocus: number;
    outOfFocusDurations: Array<number>;
    constructor();
    reset(): void;
    getMaxBlurDurationSinceLastReset(): number;
    onFocus: () => void;
    onBlur: () => void;
}
export declare const focus_tracker: FocusTracker;
export {};