/**
 * The identity of the session this tab last read: a string when signed in,
 * `null` when known to be signed out (or signing out), `undefined` before the
 * first read. Kept apart from `use-session` so action fetches can read it
 * without depending on the session hook.
 */
export declare function currentSessionIdentity(): string | null | undefined;
export declare function recordSessionIdentity(value: string | null | undefined): void;