Next export with appDir fails

[kevzettler]

Verify canary release

• [X] I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 21.5.0: Tue Apr 26 21:08:29 PDT 2022; root:xnu-8020.121.3~4/RELEASE_ARM64_T8101
Binaries:
  Node: 18.13.0
  npm: 8.19.3
  Yarn: 3.4.1
  pnpm: N/A
Relevant packages:
  next: 13.1.7-canary.2
  eslint-config-next: N/A
  react: 18.2.0
  react-dom: 18.2.0

Which area(s) of Next.js are affected? (leave empty if unsure)

App directory (appDir: true), Static HTML Export (next export)

Link to the code that reproduces this issue

https://github.com/kevzettler/bad-nextjs-export-bug

To Reproduce

npm install && next build && next export

Describe the Bug

next export fails with the following

warn  - You have enabled experimental feature (appDir) in next.config.js.
warn  - Experimental features are not covered by semver, and may cause unexpected or broken application behavior. Use at your own risk.
info  - Thank you for testing `appDir` please leave your feedback at https://nextjs.link/app-feedback

info  - using build directory: /Users/kevzettler/code/bad-nextjs-export-bug/.next
info  - Copying "static build" directory
info  - No "exportPathMap" found in "/Users/kevzettler/code/bad-nextjs-export-bug/next.config.js". Generating map from "./pages"
info  - Launching 7 workers
info  - Copying "public" directory
info  - Exporting (2/2)
PageNotFoundError: Cannot find module for page: /about
    at Object.getPagePath (/Users/kevzettler/code/bad-nextjs-export-bug/node_modules/next/dist/server/require.js:77:15)
    at /Users/kevzettler/code/bad-nextjs-export-bug/node_modules/next/dist/export/index.js:382:48
    at Array.map (<anonymous>)
    at /Users/kevzettler/code/bad-nextjs-export-bug/node_modules/next/dist/export/index.js:373:69
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async Span.traceAsyncFn (/Users/kevzettler/code/bad-nextjs-export-bug/node_modules/next/dist/trace/trace.js:79:20) {
  code: 'ENOENT'
}

Expected Behavior

More clarity in the error message. What is actually missing? The file app/about/page.tsx exists and renders in next dev

Which browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

No response

[HummingMind]

Next export is not yet available/supported for appDir in next 13 as far as I know. You can track the status on the roadmap page: here

[pixelpax]

Damn. I really need this feature. This is a blocker on my app :/

[kevzettler]

Yeah this is a bummer I wouldn't have used the latest version had I know this was broken. Now I guess I'll port to an earlier version and by the time I migrate I assume export will probably be available in the appDir support

[HummingMind]

You don't have to port to the older version. You can stay on 13. Just don't use appDir. That way you get all the other improvements of v13.

[pixelpax]

You don't have to port to the older version. You can stay on 13. Just don't use appDir. That way you get all the other improvements of v13.

That's fair; I've just already put ~150 hours into structuring my app around functional async server side components, which I can't use in pages/

This is actually the only problem I've encountered so far that seems too in-the-weeds of the build process for me to address. I'll just cross my fingers for a workaround soon 🤞

[gyurielf]

Hello there!

FYI - Seems to be it's supported now: https://github.com/vercel/next.js/pull/47022