Function addMissingParamsToUrl

src/url.js:250–261

(url, params)

 * @return {string}
 */
export function addMissingParamsToUrl(url, params) {
  const location = parseUrlDeprecated(url);
  const existingParams = parseQueryString(location.search);
  const paramsToAdd = {};
  const keys = Object.keys(params);
  for (let i = 0; i < keys.length; i++) {
    if (!hasOwn(existingParams, keys[i])) {
      paramsToAdd[keys[i]] = params[keys[i]];
    }
  }
  return addParamsToUrl(url, paramsToAdd);
}

/**
 * Serializes the passed parameter map into a query string with both keys