Function isActive

packages/router/src/url_tree.ts:119–131

(
  url: string | UrlTree,
  router: Router,
  matchOptions?: Partial<IsActiveMatchOptions>,
)

 * @publicApi 21.1
 */
export function isActive(
  url: string | UrlTree,
  router: Router,
  matchOptions?: Partial<IsActiveMatchOptions>,
): Signal<boolean> {
  const urlTree = url instanceof UrlTree ? url : router.parseUrl(url);
  return computed(() =>
    containsTree(router.lastSuccessfulNavigation()?.finalUrl ?? new UrlTree(), urlTree, {
      ...subsetMatchOptions,
      ...matchOptions,
    }),
  );
}

export function containsTree(
  container: UrlTree,