URL + QueryString object converted to string

QueryString.gs

/**
 * @param {string} url
 * @param {Object<string,string|string[]>} qs - query string
 */
function urlWithQueryStringObject(url, qs) {
  if (!qs) return url;
  return [
    url,
    Object.entries(qs)
    .map(([k,v]) => {
      if (Array.isArray(v)) {
        return v
        .map((v2) => [encodeURIComponent(k.trim()), encodeURIComponent(v2.toString().trim())].join("="))
        .join("&");
      }
      return [encodeURIComponent(k.trim()),encodeURIComponent(v.toString().trim())].join("=");
    })
    .join("&")
  ]
  .join(/\?/.test(url) ? "&" : "?");
}

z Example.gs

function example() {
  Logger.log(
    urlWithQueryStringObject("list"),
  );
  Logger.log(
    urlWithQueryStringObject("list?pageSize=9", {
      pageToken: "pineapple",
    }),
  );
  Logger.log(
    urlWithQueryStringObject("list", {
      pageToken: "pineapple",
      pageSize: 18,
    }),
  );
  Logger.log(
    urlWithQueryStringObject("list", {
      pageToken: "pineapple",
      pageSize: [18,"tacos","99"],
    }),
  );
  Logger.log(
    urlWithQueryStringObject("list", {
      pageToken: "pineapple",
      pageSize: [18,"tacos","99"],
      complication: { // not supported right now
        color: "red",
      },
    }),
  );
  Logger.log(
    urlWithQueryStringObject("list", {
      pageToken: "pineapple",
      complication: { // not supported right now
        color: ["red","yellow","green"],
      },
      pageSize: [18,"tacos","99"],
    }),
  );
}