import type { StorageService } from './storage/types';
import type { SessionService } from './types';
/**
 * Default implementation for the {@link SessionService}.
 */
export declare class DefaultSessionService implements SessionService {
    protected storageService: StorageService;
    protected ttlMs: number;
    /** Session id key to use as a key in the storage. */
    static readonly SESSION_ID_KEY = "session-id";
    /** Global instance of the {@link SessionService}. */
    static instance: SessionService;
    constructor(storageService?: StorageService, ttlMs?: number);
    /**
     * Returns the session id of the storage.
     *
     * @returns The current session id.
     */
    getSessionId(): string;
    /**
     * Removes the session if from the storage.
     */
    clearSessionId(): void;
}