/**
 * Bulletproof, simple, and clear session manager for single-session logic.
 * Uses only localStorage for state. No in-memory flags. No navigation listeners.
 * Easy to read, maintain, and debug.
 */
declare class SessionStateManager {
    private STORAGE_KEY;
    private SESSION_ID_KEY;
    private readonly namespace;
    constructor(namespace: string);
    setActive(sessionId: string): void;
    setInactive(): void;
    isActive(): boolean;
    getSessionId(): string | null;
    debugLog(message: string): void;
    static isValidSessionId(sessionId: string | null): boolean;
}
export default SessionStateManager;