React Router 7.6.0 with Bun -- issues with _build.routeDiscovery: [vite] Internal server error: undefined is not an object (evaluating '_build.routeDiscovery.manifestPath')

[ngmaibulat]

When I use React-Router 7.6.0 with Bun, I often get run time errors about absence of routeDiscovery in _build object.

In createRequestHandler(build, mode), I try to print out the build object and indeed I don't see routeDiscovery there:

Module {
  assets: [Getter],
  assetsBuildDirectory: [Getter],
  basename: [Getter],
  future: [Getter],
  ssr: [Getter],
  isSpaMode: [Getter],
  prerender: [Getter],
  publicPath: [Getter],
  entry: [Getter],
  routes: [Getter],
}

• The problem does not happen in NodeJS, only in Bun.
• Adding config options like: routeDiscovery: { mode: "lazy", manifestPath: "/__manifest" }, does not help

I tried to apply a patch, which helped:

if (!build.routeDiscovery) {
    const routeDiscovery = { mode: "lazy", manifestPath: "/__manifest" }
    build = {...build, routeDiscovery};
 }

in:

var createRequestHandler = (build, mode) => {
  let _build;
  let routes;
  let serverMode;
  let staticHandler;
  let errorHandler;
  
if (!build.routeDiscovery) {
    const routeDiscovery = { mode: "lazy", manifestPath: "/__manifest" }
    build = {...build, routeDiscovery};
 }

[ngmaibulat]

closing -- asked in react-router repo
asked here by mistake