/**
 * Safely read from a cookie.
 * - Returns undefined if not in browser or the cookie is missing
 * - Returns parsed JSON if the value is JSON
 * - Returns plain string if not JSON
 * - Never throws
 */
export declare function readCookie<T = unknown>(name: string): T | string | undefined;
/**
 * Safely write a cookie.
 * - Automatically JSON.stringifies objects/arrays/booleans/numbers
 * - Stores plain strings as-is
 * - Never throws
 */
export declare function writeCookie(name: string, value: unknown, maxAgeSeconds?: number): void;
/**
 * Remove a cookie safely
 */
export declare function removeCookie(name: string): void;