`advancedChunks`/`strictExecutionOrder` breaks React Router app runtime

[pawelblaszczyk5]

Describe the bug

Hi 👋

Report this re thread on Discord: https://discord.com/channels/1171783886200643635/1382015960625582133

Enabling strictExecutionOrder and/or advancedChunks breaks React Router app at runtime. Stuff that normally is defined turns out to be undefined. At my job project, I can reproduce it also in client build where routes components which has side-effects (RR wrap them with HOC) are undefined. I couldn't replicate this in smaller project but I spotted that this also happens in server build even with bare template.

Build passes successfully but then I'm running into this:

TypeError: Cannot read properties of undefined (reading 'routes')

(full logs below). It seems like one of init functions isn't invoked at all:

Similar thing happens at my job project where RR warns me that Route component isn't defined - adding log before exports I can observe them being still not initialized.

Reproduction

https://github.com/pawelblaszczyk5/rolldown-vite-strict-ordering

Steps to reproduce

1. Create React Router project - e.g. pnpm create react-router@latest
2. Enable either advancedChunks and/or strictExecutionOrder (this can be either enabled globally or per environment if environment enabled in RR config)
3. Run build - e.g. pnpm run build
4. Start app - e.g. pnpm run start
5. Visit server and observe error in logs

System Info

System:
    OS: macOS 15.5
    CPU: (8) arm64 Apple M1 Pro
    Memory: 294.42 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 24.1.0 - ~/.local/state/fnm_multishells/1679_1749638326206/bin/node
    npm: 11.3.0 - ~/.local/state/fnm_multishells/1679_1749638326206/bin/npm
    pnpm: 10.12.1 - ~/.local/state/fnm_multishells/1679_1749638326206/bin/pnpm
    bun: 1.1.33 - ~/.bun/bin/bun
  Browsers:
    Chrome: 137.0.7151.69
    Edge: 120.0.2210.121
    Safari: 18.5
  npmPackages:
    rolldown-vite:  6.3.18

Used Package Manager

pnpm

Logs

I'm not sure how to run debug build using RR but I provided reproduction. Also here is the log of server erroring:

Click to expand!

pawelblaszczyk@MacBookPro rolldown-vite-strict-ordering % pnpm start

> rolldown-vite-strict-ordering@ start /Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering
> react-router-serve ./build/server/index.js

[react-router-serve] http://localhost:3000 (http://192.168.1.47:3000)
TypeError: Cannot read properties of undefined (reading 'routes')
    at ServerRouter (file:///Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-router@7.6.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/react-router/dist/development/chunk-NL6KNZEE.mjs:9811:14)
    at renderWithHooks (/Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:4179:18)
    at renderElement (/Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:4317:14)
    at retryNode (/Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:4919:16)
    at performWork (/Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:5561:13)
    at AsyncLocalStorage.run (node:internal/async_local_storage/async_context_frame:63:14)
    at /Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:6153:27
    at node:internal/process/task_queues:151:7
    at AsyncResource.runInAsyncScope (node:async_hooks:214:14)
    at AsyncResource.runMicrotask (node:internal/process/task_queues:148:8)
TypeError: Cannot read properties of undefined (reading 'routes')
    at ServerRouter (file:///Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-router@7.6.2_react-dom@19.1.0_react@19.1.0__react@19.1.0/node_modules/react-router/dist/development/chunk-NL6KNZEE.mjs:9811:14)
    at renderWithHooks (/Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:4179:18)
    at renderElement (/Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:4317:14)
    at retryNode (/Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:4919:16)
    at performWork (/Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:5561:13)
    at AsyncLocalStorage.run (node:internal/async_local_storage/async_context_frame:63:14)
    at /Users/pawelblaszczyk/dev/rolldown-vite-strict-ordering/node_modules/.pnpm/react-dom@19.1.0_react@19.1.0/node_modules/react-dom/cjs/react-dom-server.node.production.js:6153:27
    at node:internal/process/task_queues:151:7
    at AsyncResource.runInAsyncScope (node:async_hooks:214:14)
    at AsyncResource.runMicrotask (node:internal/process/task_queues:148:8)
GET / 500 - - 25.786 ms

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs and the Rolldown-related guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[hi-ogawa]

It looks like re-export in general seems to have an issue with strictExecutionOrder. I reported with a minimal repro rolldown/rolldown#4920

React router's server manifest hits this case as they have a following structure https://github.com/remix-run/react-router/blob/98367e49900701c460cb08eb16c2441da5007efc/packages/react-router-dev/vite/plugin.ts#L722-L724

// server entry virtual
export { default as assets } from "...server manifest virtual..."
...

// server manifest virtual
export default ...

[pawelblaszczyk5]

Hmm, I'm wondering is it only related to the reexport - as mentioned I have similiar issue on the client-side build at bigger project - but this one I can't reproduce in minimal manner.

However when looking into output I observe similar case (collapsed the function for brevity):

There's an X function that initialize stuff - it's not invoked anywhere. But there's also Z function that does nothing but it's invoked 😓 But there's no re-export in source code

[hyf0]

It's fixed by rolldown/rolldown#4933.

[pawelblaszczyk5]

It's fixed by rolldown/rolldown#4933.

Is there some easy way of using the pre release from pkg pr new with rolldown-vite? I’d happily check if it also solves problems at my bigger projects 😃

[hyf0]

It's fixed by rolldown/rolldown#4933.

Is there some easy way of using the pre release from pkg pr new with rolldown-vite? I’d happily check if it also solves problems at my bigger projects 😃

Try copy resolution to your package.json that declares vite/rolldow-vite.

{
  "dependencies": {},
  "resolutions": {
    "rolldown": "https://pkg.pr.new/rolldown@4933"
  }
}

[pawelblaszczyk5]

Hmm, in one project it solved all issues. But in second one I'm getting completely new error, even without enabling any of these options about ReferenceError. I'll try to reproduce it in a smaller project though

[pawelblaszczyk5]

At first try it seems hard to be reproduced in smaller project, but I'll write up some clues which I already have (I'm not sure how valuable they're) and keep trying:

• Effect (https://efect.website) has an Array module - it's used by my own code - both web app and its dependencies in monorepo an by various @effect/* dependencies (both in web app and the monorepo dependencies)
• I'm using it via import {Array} from "effect"
• Some of dependencies use it via import * as Arr from "effect/array"
• All my usages in output code looks like Array$1.*
• In the final build there is my import aliased as Array$1., but import insides of one of dependencies (only this one) @effect/opentelemetry are left as Arr.* but Arr isn't defined anywhere:

Most of other stuff is suffixed with something like $x,

[hi-ogawa]

Let me close this issue since strictExecutionOrder specific issues seems solved. Please feel free to create a new issue with a reproduction for the new error. Thanks for testing it out further 🙏