React-Router-Framework 7.6.0 with Bun

[ngmaibulat]

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

Actual error message:
_build.routeDiscovery: [vite] Internal server error: undefined is not an object (evaluating '_build.routeDiscovery.manifestPath')

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 workaround, which helped:

export const createRequestHandler: CreateRequestHandlerFunction = (
  build,
  mode
) => {
  let _build: ServerBuild;
  let routes: ServerRoute[];
  let serverMode: ServerMode;
  let staticHandler: StaticHandler;
  let errorHandler: HandleErrorFunction;

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

Question

• do u have any idea why we in Bun, we have to end with build parameter without routeDiscovery ?
• can u suggest better ways to fix the problem - other than the workaround above

[ngmaibulat]

So far, I believe that the dev server package @react-router/dev was left at version 7.5.3.
Hence the build object did not include routeDiscovery and caused a problem.
(During dev, createRequestHandler is called from vite plugin)

I will close the question a bit later...