export declare const SESSION_SIGNAL_CHANNEL = "bounded.session";
/** Tell the other SDK copies on this origin that the session record under `key` changed. */
export declare function announceSessionChange(key: string): void;
/** Run `listener` when another SDK copy announces a session change. Returns the unsubscribe. */
export declare function onSessionChange(listener: (key: string) => void): () => void;
/** Test seam: forget the channel so a fresh BroadcastChannel is opened next time. */
export declare function resetSessionSignalForTests(): void;