[FEATURE] support turbopack

[ducan-ne]

Describe the bug

When I tried with latest next@15.3 next build --turbo, it seems break opennextjs, I got "Internal Server Error" on worker https://autumn-queen-08d8.graphvn.workers.dev/

Steps to reproduce

1. create with npm create cloudflare@latest -- my-next-app --framework=next --platform=workers
2. upgrade to next latest
3. deploy to cloudflare worker

Expected behavior

should works as expected

@opennextjs/cloudflare version

~1.0.0-beta.0 || ^1.0.0

Wrangler version

^4.10.0

next info output

Using vars defined in .dev.vars

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 23.0.0: Fri Sep 15 14:41:43 PDT 2023; root:xnu-10002.1.13~1/RELEASE_ARM64_T6000
  Available memory (MB): 32768
  Available CPU cores: 10
Binaries:
  Node: 22.14.0
  npm: 10.9.2
  Yarn: 1.19.2
  pnpm: 10.6.4
Relevant Packages:
  next: 15.3.0 // Latest available version is detected (15.3.0).
  eslint-config-next: N/A
  react: 19.1.0
  react-dom: 19.1.0
  typescript: 5.8.3
Next.js Config:
  output: N/A

Additional context

No response

[vicb]

Please include a repo (link a minimal repro in a GH repository).
Thanks.

[mlshv]

I have the same issue!

I see this error in cloudflare logs:

" × Error: Failed to load chunk server/chunks/ssr/[root-of-the-
server]_692606a6._-js" ,

Going to investigate further.

[mlshv]

I tried to compare outputs from normal mode and turbopack mode but couldn't figure out the root cause. So here's the reproduction

All you need to do to reproduce it is just create a project from template using the command from the docs and then change "build": "next build" to "build": "next build --turbopack". Then run preview npm script and you will see the Internal Server Error in the browser.

If you need a repo, just clone mine:
https://github.com/mlshv/opennext-cloudflare-turbo-repro

[harrisrobin]

Experiencing the same thing as well.

[vicb]

next build --turbo is not supported by OpenNext at the moment

opennextjs-cloudflare/packages/cloudflare/src/cli/build/bundle-server.ts

Lines 140 to 143 in a169b76

	// The 2 following defines are used to reduce the bundle size by removing unnecessary code
	// Next uses different precompiled renderers (i.e. `app-page.runtime.prod.js`) based on if you use `TURBOPACK` or some experimental React features
	// Turbopack is not supported for build at the moment, so we disable it
	"process.env.TURBOPACK": "false",

We will look into implementing it later.

For now use next build instead.