import type { Sessions } from './schema.js';
/**
 * Serializes the session as a JSON and stores it in the system.
 * @param session - the session to store.
 */
export declare function store(sessions: Sessions): Promise<void>;
/**
 * Fetches the sessions from the local storage and returns it.
 * If the format of the object is invalid, the method will discard it.
 * @returns Returns a promise that resolves with the sessions object if it exists and is valid.
 */
export declare function fetch(): Promise<Sessions | undefined>;
/**
 * Removes a session from the system.
 */
export declare function remove(): Promise<void>;
/**
 * Gets the session alias for a given user ID.
 *
 * @param userId - The user ID of the session to get the alias for.
 * @returns The alias for the session if it exists, otherwise undefined.
 */
export declare function getSessionAlias(userId: string): Promise<string | undefined>;
/**
 * Sets the alias for a given user's session and persists it.
 *
 * @param userId - The user ID of the session to update.
 * @param alias - The new alias to set.
 */
export declare function setSessionAlias(userId: string, alias: string): Promise<void>;
/**
 * Finds a session by its alias.
 *
 * @param alias - The alias to search for
 * @returns The user ID if found, otherwise undefined
 */
export declare function findSessionByAlias(alias: string): Promise<string | undefined>;