/**
 * Internal session envelope persisted by stores (JSON-serialized).
 */
export interface SessionMeta {
    readonly attributes: Record<string, unknown>;
    flashNext: Record<string, unknown>;
    flashNow: Record<string, unknown>;
    csrfToken: string | null;
    previousUrl: string | null;
}
/**
 * @returns Empty session meta structure.
 */
export declare function emptySessionMeta(): SessionMeta;
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