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TanStack Start >> Clerk >> WebHooks >> Netlify #4762
Description
Which project does this relate to?
Start
Describe the bug
I've tried Clerk Webhooks on localhost with success (API Route). When published on Netlify I'm getting this error (not related to webook validation or secretes):
Jul 24, 03:46:36 PM: c61bb29d ERROR Error verifying webhook: Error: ENOENT: no such file or directory, mkdir '/opt/build'
at async Object.mkdir (node:internal/fs/promises:852:10)
at async Object.setItem (file:///var/task/chunks/_/ssr.mjs:1000:4)
at async AsyncFunction.__executeServer (file:///var/task/chunks/_/ssr.mjs:909:80)
at async client (file:///var/task/chunks/_/ssr.mjs:1103:17)
at async Object.serverFn (file:///var/task/chunks/_/ssr.mjs:4585:18)
at async server (file:///var/task/chunks/_/ssr.mjs:1108:20)
at async client (file:///var/task/chunks/_/ssr.mjs:1103:17)
at async file:///var/task/chunks/_/ssr.mjs:4748:22
at async NeonSession.transaction (file:///var/task/node_modules/drizzle-orm/neon-serverless/session.js:183:22)
at async Object.serverFn (file:///var/task/chunks/_/ssr.mjs:4739:2) {
errno: -2,
code: 'ENOENT',
syscall: 'mkdir',
path: '/opt/build'
}
Your Example Website or App
Steps to Reproduce the Bug or Issue
Deploy WebHook to Netfly
Expected behavior
Just works
Screenshots or Videos
No response
Platform
"@tanstack/react-router": "^1.129.8",
"vite": "npm:rolldown-vite@^7.0.10",
Additional context
No response
Activity
[-]TanStack Start >> Clerk >> WebHooks >> Netigly[/-][+]TanStack Start >> Clerk >> WebHooks >> Netlify[/+]schiller-manuel commentedon Jul 24, 2025
without any code we are not able to investigate
ttessarolo commentedon Jul 24, 2025
I see. But this is part of a big code base and it is hard to replicate just that part.
Anyway it seams to be ssr.mjs trying to write in a non existing folder after deployment.
Ugzuzg commentedon Sep 6, 2025
I've just upgraded to 1.131.35 and have a similar issue on Vercel. https://personal-space-git-upgrade-tanstack-ugzuzgs-projects.vercel.app/en/climbing
Ugzuzg/personal-space#21
LadyBluenotes commentedon Jul 15, 2026
This appears to have been addressed by #6940. The static server function cache no longer attempts to write into the build output during normal production runtime, which matches the
/opt/buildand/vercelfailures reported here.Could either of you retry this with the current Start version and confirm? I haven't reproduced the original Netlify or Vercel deployment itself, but if you can reproduce this on a current version of Start can you open a new issue with a repro?