/**
 * Persisted session. The refresh token is the durable credential; access
 * token + expiry ride along (when available) so a reload — or a server-side
 * cookie read — can reuse a still-fresh access token instead of burning a
 * refresh per hydration (rotation storm under SSR).
 */
interface PersistedSession {
    refreshToken: string;
    accessToken?: string;
    /** ms epoch */
    expiresAt?: number;
}
interface SessionStorageAdapter {
    load(): PersistedSession | null;
    save(session: PersistedSession): void;
    clear(): void;
    /** Serialize refresh read/exchange/write across users of this store. */
    withLock?<T>(operation: () => Promise<T>): Promise<T>;
}
declare function memorySessionStorage(): SessionStorageAdapter;
declare function localStorageSessionStorage(key?: string): SessionStorageAdapter;

export { type PersistedSession as P, type SessionStorageAdapter as S, localStorageSessionStorage as l, memorySessionStorage as m };