Function parseQueryString

third_party/subscriptions-project/swg.js:5359–5379

* Parses and builds Object of URL query string. * @param {string} query The URL query string. * @return {!Object }

(query)

 * @return {!Object<string, string>}
 */
function parseQueryString(query) {
  if (!query) {
    return {};
  }
  return (/^[?#]/.test(query) ? query.slice(1) : query)
    .split('&')
    .reduce((params, param) => {
      const item = param.split('=');
      try {
        const key = decodeURIComponent(item[0] || '');
        const value = decodeURIComponent(item[1] || '');
        if (key) {
          params[key] = value;
        }
      } catch (err) {
        // eslint-disable-next-line no-console
        warn(`SwG could not parse a URL query param: ${item[0]}`);
      }
      return params;
    }, {});
}

/**
 * Adds a parameter to a query string.