Function serializeQueryString

src/url.js:269–283

(params)

 * @return {string}
 */
export function serializeQueryString(params) {
  const s = [];
  for (const k in params) {
    let v = params[k];
    if (v == null) {
      continue;
    }

    v = arrayOrSingleItemToArray(v);
    for (let i = 0; i < v.length; i++) {
      s.push(urlEncodeKeyValue(k, v[i]));
    }
  }
  return s.join('&');
}

/**
 * Returns `true` if the URL is secure: either HTTPS or localhost (for testing).