Code Splitting Issues with TanStack Start and Cloudflare Pages Deployment (Side Effect)

[sarabenchinoun]

Which project does this relate to?

Start

Describe the bug

I'm experiencing issues with code splitting when deploying a TanStack Start project to Cloudflare Pages. The application appears to be splitting code in a way that breaks functionality or causes errors after deployment, even though it works correctly in development.

Your Example Website or App

https://codesandbox.io/p/github/sarabenchinoun/start-basic/draft/muddy-platform

Steps to Reproduce the Bug or Issue

1. Open the link: https://codesandbox.io/p/github/sarabenchinoun/start-basic/draft/muddy-platform
2. Install dependencies: pnpm i
3. Run the build: pnpm build
4. Preview the build with Cloudflare: pnpm preview

Expected behavior

The deployed application on Cloudflare Pages should be successful and behave identically to the application running in development mode. Code splitting should be handled correctly, and all routes and components should function as expected.

Screenshots or Videos

Platform

• Operating System: macOS
• Node.js version: v22
• pnpm version: 9.15.4
• wrangler version: "3.109.0"
• TanStack Start version: "1.104.2"
• Browser: Firefox

Additional context

This issue occurs even in a new project, so it doesn't seem to be related to my project's specific code.

• This issue was reproduced in a fresh TanStack Start project.
• The project uses pnpm as the package manager.
• I suspect the problem is related to how TanStack Start's code splitting interacts with Cloudflare Pages' build and deployment process.

[stiks]

Have same issue

[Yaoshiko]

Me too. I had the same warnings with a working repo, and I don't with a broken repo, so I don't think that's the issue.
I opened a thread and created a minimal repo to reproduce it: pnpm preview in master works, in bug-cf-deployment doesn't. It seems that it happens since version 1.82.

[scobbe]

After version update, when I run vinxi build --preset cloudflare-pages now it has suddenly started hanging on me following the build log message Built your router client successfully (perhaps related to defineConfig now returning a Promise)?

[afkcodes]

I am not able to deploy and get this

✘ [ERROR] Deployment failed!

  Failed to publish your Function. Got error: Uncaught Error: No such module "node:http".
    imported from "chunks/nitro/nitro.mjs"```