/**
 * Session Manager - Handles session_id and window_id
 *
 * Uses shared StorageManager for consistent storage operations.
 *
 * Session ID: Unique per user session, expires after 30 minutes of inactivity
 * Window ID: Unique per browser tab, persists across page reloads
 */
import { PersistenceMethod } from "./types";
export declare class SessionManager {
    private storage;
    private _windowId;
    private _isNewSession;
    constructor(storageMethod?: PersistenceMethod, cross_subdomain?: boolean);
    /**
     * Hydrate window ID from sessionStorage.
     * Called by VTilt._boot() once the browser environment is ready.
     */
    hydrateFromStorage(): void;
    /**
     * Get session ID (always returns a value, generates if needed)
     */
    getSessionId(): string;
    /**
     * Set session ID in storage
     * Extends TTL if session_id exists, generates new one if not
     */
    setSessionId(): string;
    /**
     * Reset session ID (generates new session on reset)
     */
    resetSessionId(): void;
    /**
     * Returns true if the current session was just started (new session ID generated
     * because the session cookie expired or didn't exist). Resets after first call.
     * Matches GA4's _ss=1 semantics.
     */
    consumeSessionStart(): boolean;
    /**
     * Get session ID from storage (raw, can return null)
     * Cookie Max-Age handles expiration automatically
     */
    private _getSessionIdRaw;
    /**
     * Store session ID
     * Uses plain string format - cookie Max-Age handles expiration
     */
    private _storeSessionId;
    /**
     * Clear session ID from storage
     */
    private _clearSessionId;
    /**
     * When a tab stays open for longer than the session timeout, rotate the
     * session even if a system event (e.g. $pageleave on background) recently
     * refreshed the cookie TTL.
     */
    private _rotateSessionIfExpired;
    private _bootstrapSessionActivityFromStorage;
    private _readSessionActivityMs;
    private _touchSessionActivity;
    private _clearSessionActivity;
    /**
     * Get window ID
     * Window ID is unique per browser tab/window and persists across page reloads
     * Always returns a window_id (generates one if not set)
     */
    getWindowId(): string;
    /**
     * Set window ID
     * Stores in sessionStorage which is unique per tab
     */
    private _setWindowId;
    /**
     * Initialize window ID
     * Detects tab duplication and handles window_id persistence
     */
    private _initializeWindowId;
    /**
     * Listen to window unload to clear primary window flag
     * This helps distinguish between page reloads and tab duplication
     */
    private _listenToUnload;
    /**
     * Update storage method at runtime
     */
    updateStorageMethod(method: PersistenceMethod, cross_subdomain?: boolean): void;
}