import { UserPreferences } from './user-preferences';
type Preferences = Record<string, UserPreferences>;
/**
 * Represents all stored user preferences.
 *
 * Preferences are stored per user, where the key is the username and the value contains the preferences for that user.
 */
export declare class UsersPreferences {
    private static readonly CURRENT_VERSION;
    /**
     * Identifies the storage format version. The version can be used to migrate persisted preferences in future releases.
     */
    readonly version: number;
    /**
     * User preferences indexed by username.
     */
    preferences: Preferences;
    /**
     * Creates a collection of user preferences.
     *
     * @param value - Optional object used to initialize the collection, typically deserialized from persistent storage.
     */
    constructor(value?: Partial<UsersPreferences> | null);
    /**
     * Returns the preferences associated with the specified user.
     *
     * @param username - The username whose preferences should be returned.
     * @returns The user's preferences, or {@code undefined} if no preferences are stored.
     */
    getUserPreferences(username: string): UserPreferences | undefined;
    /**
     * Stores the preferences for the specified user.
     *
     * @param username - The username whose preferences should be updated.
     * @param userPreferences - The preferences to associate with the user.
     */
    setUserPreferences(username: string, userPreferences: UserPreferences): void;
    /**
     * @returns A JSON string representing the preferences of users.
     */
    toString(): string;
}
export {};