/**
 * User engagement tracking utilities
 */
/**
 * Track time spent on page
 */
export declare class TimeTracker {
    private startTime;
    private totalTime;
    private isActive;
    private visibilityChangeHandler;
    constructor();
    private setupVisibilityTracking;
    /**
     * Get total time spent on page (in seconds)
     */
    getTimeSpent(): number;
    /**
     * Cleanup
     */
    destroy(): void;
}
/**
 * Track scroll depth
 */
export declare class ScrollTracker {
    private maxScrollDepth;
    private scrollHandler;
    private milestones;
    constructor();
    private setupScrollTracking;
    private updateScrollDepth;
    /**
     * Get maximum scroll depth percentage
     */
    getMaxScrollDepth(): number;
    /**
     * Get scroll milestones reached
     */
    getMilestones(): number[];
    /**
     * Cleanup
     */
    destroy(): void;
}
/**
 * Track mouse/touch interactions
 */
export declare class InteractionTracker {
    private clickCount;
    private moveCount;
    private lastMoveTime;
    private clickHandler;
    private moveHandler;
    constructor();
    private setupInteractionTracking;
    /**
     * Get interaction metrics
     */
    getMetrics(): {
        clicks: number;
        moves: number;
    };
    /**
     * Cleanup
     */
    destroy(): void;
}
/**
 * Track page visibility and tab focus
 */
export declare class VisibilityTracker {
    private visibleTime;
    private startTime;
    private isVisible;
    private focusCount;
    private blurCount;
    private visibilityHandler;
    private focusHandler;
    private blurHandler;
    constructor();
    private setupVisibilityTracking;
    /**
     * Get visibility metrics
     */
    getMetrics(): {
        totalVisibleTime: number;
        focusCount: number;
        blurCount: number;
        isCurrentlyVisible: boolean;
    };
    /**
     * Cleanup
     */
    destroy(): void;
}
/**
 * Comprehensive engagement tracker
 */
export declare class EngagementTracker {
    private timeTracker;
    private scrollTracker;
    private interactionTracker;
    private visibilityTracker;
    constructor();
    /**
     * Get all engagement metrics
     */
    getMetrics(): {
        timeSpent: number;
        activeTime: number;
        scrollDepth: number;
        scrollMilestones: number[];
        clicks: number;
        mouseMoves: number;
        focusCount: number;
        blurCount: number;
        engagementScore: number;
        isEngaged: boolean;
    };
    /**
     * Calculate engagement score based on multiple factors
     */
    private calculateEngagementScore;
    /**
     * Cleanup all trackers
     */
    destroy(): void;
}
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