/**
 * Exports CS userId with which the client is opted in with.
 *
 * @param {function} onUserIdObtained - A callback that consumes the userId.
 */
export declare const getUserId: (onUserIdObtained: (userId: string) => void) => void;
/**
 * Opt user IN Contentsquare tracking program.
 * This allows Contentsquare SDK gather user behaviors while navigating through the app.
 */
export declare const optIn: () => void;
/**
 * Opt user OUT of the Contentsquare tracking program.
 * This will stop Contentsquare SDK from gathering any further user behavior while navigating
 * around the app.
 */
export declare const optOut: () => void;
/**
 * Sends a User Identifier to Contentsquare tracking services. This identifier is immediately
 * hashed so no PII can ever be accessed.
 *
 * @param {string} userIdentifier The user identifier should be max 100 characters long.
 */
export declare const sendUserIdentifier: (userIdentifier: string) => void;