import type { SkewProtectionEvent } from './getRuntimeConfigSkewProtection.js';
/**
 * Get the client's deployment version from the skew protection cookie.
 * Returns undefined if no cookie is set.
 */
export declare function getClientVersion(event: SkewProtectionEvent): string | undefined;
/**
 * Check if the client is outdated based on cookie version vs current build ID
 */
export declare function isClientOutdated(event: SkewProtectionEvent): boolean;