/**
 * Abstract interface for persisting Fragment session cookies.
 */
export declare abstract class SessionStorage {
    abstract save(sessionId: string, cookies: Record<string, string>, metadata?: Record<string, any> | null): Promise<void>;
    abstract load(sessionId: string): Promise<Record<string, string> | null>;
    abstract delete(sessionId: string): Promise<void>;
    exists(sessionId: string): Promise<boolean>;
    loadMetadata(_sessionId: string): Promise<Record<string, any> | null>;
}
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