export declare const generateUserId: () => string;
export declare const readStoredUserId: (funnelId?: string | null | undefined) => string | null;
export declare const persistUserId: (value: string, funnelId?: string | null | undefined) => string;
export declare function getOrCreateClientUserId(): string;
export declare function persistCanonicalUserId(userId: string): string;
export declare function getBootstrapCandidateUserId(fallbackUserId?: string | null): string | null;