Function getInherited

packages/router/src/router_state.ts:267–313

(
  route: ActivatedRouteSnapshot,
  parent: ActivatedRouteSnapshot | null,
  paramsInheritanceStrategy: ParamsInheritanceStrategy,
)

 * route is component-less.
 */
export function getInherited(
  route: ActivatedRouteSnapshot,
  parent: ActivatedRouteSnapshot | null,
  paramsInheritanceStrategy: ParamsInheritanceStrategy,
): Inherited {
  let inherited: Inherited;
  const {routeConfig} = route;
  if (
    parent !== null &&
    (paramsInheritanceStrategy === 'always' ||
      // inherit parent data if route is empty path
      routeConfig?.path === '' ||
      // inherit parent data if parent was componentless
      (!parent.component && !parent.routeConfig?.loadComponent))
  ) {
    inherited = {
      params: {...parent.params, ...route.params},
      data: {...parent.data, ...route.data},
      resolve: {
        // Snapshots are created with data inherited from parent and guards (i.e. canActivate) can
        // change data because it's not frozen...
        // This first line could be deleted chose to break/disallow mutating the `data` object in
        // guards.
        // Note that data from parents still override this mutated data so anyone relying on this
        // might be surprised that it doesn't work if parent data is inherited but otherwise does.
        ...route.data,
        // Ensure inherited resolved data overrides inherited static data
        ...parent.data,
        // static data from the current route overrides any inherited data
        ...routeConfig?.data,
        // resolved data from current route overrides everything
        ...route._resolvedData,
      },
    };
  } else {
    inherited = {
      params: {...route.params},
      data: {...route.data},
      resolve: {...route.data, ...(route._resolvedData ?? {})},
    };
  }

  if (routeConfig && hasStaticTitle(routeConfig)) {
    inherited.resolve[RouteTitleKey] = routeConfig.title;
  }
  return inherited;
}

/**
 * @description