/**
 * Sets a cookie with the specified name, value, and optional expiration in days.
 * @param {string} name - The name of the cookie.
 * @param {string} value - The value to be stored in the cookie.
 * @param {number} [days] - Optional number of days until the cookie expires.
 */
export declare const setCookie: (name: string, value: string, days?: number) => void;
/**
 * Retrieves the value of a cookie by its name.
 * @param {string} name - The name of the cookie to retrieve.
 * @returns {string|null} The value of the cookie if found, or null if not found.
 */
export declare const getCookie: (name: string) => string | undefined;
/**
 * Deletes a cookie by setting its expiration date to the past.
 * @param {string} name - The name of the cookie to delete.
 */
export declare const deleteCookie: (name: string) => void;
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