[Bug]: (v7) Prerendering Fails with React 19

[abdel-17]

What version of React Router are you using?

7.0.0-pre.1

Steps to Reproduce

1. Go to https://stackblitz.com/edit/vitejs-vite-cibu2u?file=app%2Fhome.jsx
2. Run pnpm build

Expected Behavior

It should build successfully.

Actual Behavior

It fails with a cryptic error likely due to React's internals changing.

[mayank99]

This can still be reproduced with the latest stable versions of React and React Router. Updated repro link: https://stackblitz.com/edit/vitejs-vite-wlza4m?file=package.json&terminal=build

Logs

❯ npm run build

> react-router build

vite v6.0.3 building for production...
✓ 41 modules transformed.
build/client/.vite/manifest.json                  1.11 kB │ gzip:  0.32 kB
build/client/assets/home-DMjzBprG.js              0.18 kB │ gzip:  0.17 kB
build/client/assets/with-props-BxDUxdVQ.js        0.44 kB │ gzip:  0.22 kB
build/client/assets/root-Dj_cnf6b.js              0.52 kB │ gzip:  0.32 kB
build/client/assets/chunk-D52XG6IA-CIXPXIh-.js  103.03 kB │ gzip: 34.93 kB
build/client/assets/entry.client-BOCz0HeL.js    179.29 kB │ gzip: 56.87 kB
✓ built in 1.38s
vite v6.0.3 building SSR bundle for production...
✓ 8 modules transformed.
build/server/.vite/manifest.json  0.17 kB
build/server/index.js             5.43 kB

TypeError: dispatcher.getOwner is not a function
	[getOwner@/node_modules/react/cjs/react.development.js#cjs:416:54
	exports.createElement@/node_modules/react/cjs/react.development.js#cjs:1330:61
	getRouteComponents@/node_modules/react-router/dist/development/index.js#cjs:6209:104
	createServerRoutes/<@/node_modules/react-router/dist/development/index.js#cjs:6229:10
	createServerRoutes@/node_modules/react-router/dist/development/index.js#cjs:6222:45
	ServerRouter@/node_modules/react-router/dist/development/index.js#cjs:8215:34
	…

TypeError: dispatcher.getOwner is not a function
	[getOwner@/node_modules/react/cjs/react.development.js#cjs:416:54
	exports.createElement@/node_modules/react/cjs/react.development.js#cjs:1330:61
	getRouteComponents@/node_modules/react-router/dist/development/index.js#cjs:6209:104
	createServerRoutes/<@/node_modules/react-router/dist/development/index.js#cjs:6229:10
	createServerRoutes@/node_modules/react-router/dist/development/index.js#cjs:6222:45
	ServerRouter@/node_modules/react-router/dist/development/index.js#cjs:8215:34
	…

x Build failed in 276ms
[react-router] Prerender: Received a 500 status code from `entry.server.tsx` while prerendering the `/` path.
Unexpected Server Error
    at validatePrerenderedResponse (/node_modules/@react-router/dev/dist/vite.js:2635:11)
    at prerenderRoute (/node_modules/@react-router/dev/dist/vite.js:2599:30) {
  code: 'PLUGIN_ERROR',
  plugin: 'react-router',
  hook: 'writeBundle'
}

[Fredkiss3]

I have found a simple way to fix this issue is to run NODE_ENV=production before building the app like this :

NODE_ENV=production npm run build

It seems like this issue is related to this : #12078

[brookslybrand]

@Fredkiss3 is correct, this is the way to force the proper NODE_ENV for React to build correctly

To be determined if we change how the defaults are setup, so I'll leave this issue open. However, for anyone looking at this issue, this is a proper solution (also true if you have ssr: false set or are using react-router-serve)

[connorjs]

This also affects ssr: false for SPA builds. I wonder why we even build/generate the server code when we have ssr: false (but that would be a separate issue).

Just mentioning since this issue and linked PR helped me understand and fix.

[brophdawg11]

ssr: false disables runtime server rendering. We still need to perform server rendering at build time to generate your index.html file

[brophdawg11]

This should be fixed by #12578 and available in the next release

[github-actions]

🤖 Hello there,

We just published version 7.1.0-pre.0 which involves this issue. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 7.1.0 which involves this issue. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[connorjs]

ssr: false disables runtime server rendering. We still need to perform server rendering at build time to generate your index.html file

@brophdawg11 - I really appreciated this emphasis. I had not shifted my thinking to this given I was still in "client react router" headspace.

Can we add something to https://reactrouter.com/how-to/spa along those lines? I could open an issue/PR if desired.

---

Separately, awesome to hear about 7.1.0! I will update right away!