/**
 * Activity Detection for Grain Analytics
 * Tracks user activity (mouse, keyboard, touch, scroll) to determine if user is active
 */
export declare class ActivityDetector {
    private lastActivityTime;
    private activityThreshold;
    private listeners;
    private boundActivityHandler;
    private isDestroyed;
    private readonly activityEvents;
    constructor();
    /**
     * Setup event listeners for activity detection
     */
    private setupListeners;
    /**
     * Handle activity event
     */
    private handleActivity;
    /**
     * Debounce function to limit how often activity handler is called
     */
    private debounce;
    /**
     * Check if user is currently active
     * @param threshold Time in ms to consider user inactive (default: 30s)
     */
    isActive(threshold?: number): boolean;
    /**
     * Get time since last activity in milliseconds
     */
    getTimeSinceLastActivity(): number;
    /**
     * Get last activity timestamp
     */
    getLastActivityTime(): number;
    /**
     * Set activity threshold
     */
    setActivityThreshold(threshold: number): void;
    /**
     * Add listener for activity changes
     */
    addListener(listener: () => void): void;
    /**
     * Remove listener
     */
    removeListener(listener: () => void): void;
    /**
     * Notify all listeners
     */
    private notifyListeners;
    /**
     * Cleanup and remove listeners
     */
    destroy(): void;
}
//# sourceMappingURL=activity.d.ts.map