Angular Router: function to map module path recursively

view-route.map.ts

export function createViewRoute(
  originalRoute: Route,
  parentPath: string
): unknown {
  const guardString = defaultTo('');
  const guardArr = defaultTo([]);
  type ViewRoute = Route & {_loadedRoutes: Routes} & {fullPath: string};
  const castRoute = originalRoute as ViewRoute;
  const fullPath =
    parentPath +
    (originalRoute.path ? '/' + originalRoute.path : originalRoute.path);
  castRoute.fullPath = fullPath;

  const children = guardArr(prop('children', castRoute));
  const loadedRoutes = guardArr(prop('_loadedRoutes', castRoute));
  const allChildren: Route[] = concat(children, loadedRoutes);

  return {
    children: allChildren.map((r) => createViewRoute(r, fullPath)),
    path: castRoute.path,
    title: guardString(castRoute.title),
    fullPath,
  };
}