import { SetUserIdOptions } from '../Interfaces/Options';
/**
 * Sets or removes user ID for the current user.
 *
 * @async
 * @param {string | null | undefined} params - A nullable, optional string containing the user ID to set.
 * @returns {Promise<void>}
 * @summary If the user ID is null or undefined, the user ID will be removed. Otherwise, the user ID will be set to the provided value.
 *
 * @example
 * await setUserId('myUserID') // Sets the user ID to 'myUserID'
 * await setUserId(null) // Removes the user ID
 * await setUserId() // Removes the user ID
 */
export declare class UserIdentityManager {
    private static readonly DEFAULT_SET_USER_ID_OPTIONS;
    static setUserId(userId?: string | null | undefined, options?: SetUserIdOptions): Promise<void>;
    static getUserId(): Promise<string | null>;
    static getUserProperties(): Promise<Record<string, any> | null>;
    static setUserProperties(params: Record<string, any>): Promise<void>;
    static removeUserId(): Promise<void>;
    private static _cleanUserIdInLocalStorage;
    private static _areUserIdsIdentical;
}
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