NextJS: Cookie setting and unsetting

cookies.ts

import { serialize, CookieSerializeOptions } from "cookie";
import { NextApiResponse } from "next";

/**
 * This sets `cookie` using the `res` object
 */

interface Cookie {
  name: string;
  value: unknown;
  options: CookieSerializeOptions | {};
}

export const setCookies = (res: NextApiResponse, cookies: Cookie[]) => {
  const parsedCookies = cookies.map(({ name, value, options }) => {
    const stringValue =
      typeof value === "object" ? "j:" + JSON.stringify(value) : String(value);

    if ("maxAge" in options) {
      options.expires = new Date(Date.now() + options.maxAge);
      options.maxAge /= 1000;
    }
    return serialize(name, stringValue, options);
  });

  res.setHeader("Set-Cookie", parsedCookies);
};

export const unsetCookies = (res: NextApiResponse, names: string[]) => {
  const parsedCookies = names.map(name =>
    serialize(name, "DONE", {
      maxAge: 0,
      path: "/"
    })
  );
  res.setHeader("Set-Cookie", parsedCookies);
};