Function normalizeQueryParams

packages/router/src/create_url_tree.ts:172–180

* Normalizes a query parameter value by using the `UrlSerializer` to serialize then parse the value. * * This ensures that the value is consistent between parsing a URL in the browser on a fresh page load (or page refresh) * and a navigation where the query parameter value is passed directly to t

(k: string, v: unknown, urlSerializer: UrlSerializer)

 * over how a browser URL is parsed into a `UrlTree` on initial load/page refresh.
 */
function normalizeQueryParams(k: string, v: unknown, urlSerializer: UrlSerializer): unknown {
  // Hack for empty string query param, which, for whatever reason, happens
  // in a test. Parsing drops empty key params (which might not really be necessary).
  // It's probably really a test issue but I don't have the time to fix it...
  k ||= 'ɵ';
  const tree = new UrlTree();
  tree.queryParams = {[k]: v};
  return urlSerializer.parse(urlSerializer.serialize(tree)).queryParams[k];
}

function tree(
  oldRoot: UrlSegmentGroup,