function fetchRouteDataimport { fetchRouteData } from "https://dotland.deno.dev/x/aleph@1.0.0-beta.40/framework/core/router.ts"; fetchRouteData(dataCache: Map<string, RouteData>,dataUrl: string,defer?: boolean,)ParametersdataCache: Map<string, RouteData>dataUrl: stringoptionaldefer: boolean