Function appendEncodedParamStringToUrl

src/url.js:184–204

(
  url,
  paramString,
  opt_addToFront
)

 * @return {string}
 */
export function appendEncodedParamStringToUrl(
  url,
  paramString,
  opt_addToFront
) {
  if (!paramString) {
    return url;
  }
  const mainAndFragment = url.split('#', 2);
  const mainAndQuery = mainAndFragment[0].split('?', 2);

  let newUrl =
    mainAndQuery[0] +
    (mainAndQuery[1]
      ? opt_addToFront
        ? `?${paramString}&${mainAndQuery[1]}`
        : `?${mainAndQuery[1]}&${paramString}`
      : `?${paramString}`);
  newUrl += mainAndFragment[1] ? `#${mainAndFragment[1]}` : '';
  return newUrl;
}

/**
 * @param {string} key