sourcemaps.deleteSourcemapsAfterUpload breaks Vercel deployment

[ocavue]

Environment

SaaS (https://sentry.io/)

Steps to Reproduce

I'm using Vercel to deploy my Next.js project. When I enable sourcemaps: { deleteSourcemapsAfterUpload: true } in next.config.js, I get the following error from Vercel:

Error: ENOENT: no such file or directory, lstat '/vercel/path0/.next/server/chunks/195.js.map'

More detailed output:

Route (pages)                              Size     First Load JS
┌ ○ /                                      8.71 kB         163 kB
├   └ css/88d021db95f13dbf.css             2.02 kB
├   /_app                                  0 B             154 kB
├ ○ /404                                   438 B           155 kB
├ ƒ /api/sentry-example-api                0 B             154 kB
├ ƒ /api/test1                             0 B             154 kB
├ ƒ /api/test2                             0 B             154 kB
├ ƒ /api/test3                             0 B             154 kB
├ ƒ /api/test4                             0 B             154 kB
├ ○ /client/test1                          429 B           155 kB
├ ○ /client/test2                          456 B           155 kB
├ ○ /client/test3                          445 B           155 kB
├ ○ /client/test4                          467 B           155 kB
├ ○ /sentry-example-page                   1.86 kB         156 kB
├ ƒ /ssr/test1                             431 B           155 kB
├ ƒ /ssr/test2                             429 B           155 kB
├ ƒ /ssr/test3                             430 B           155 kB
└ ƒ /ssr/test4                             432 B           155 kB
+ First Load JS shared by all              155 kB
  ├ chunks/framework-8722668362422965.js   45.3 kB
  ├ chunks/main-4d4ce5325c2179ff.js        32.2 kB
  ├ chunks/pages/_app-c18a80145f513654.js  76 kB
  └ other shared chunks (total)            1.66 kB
○  (Static)   prerendered as static content
ƒ  (Dynamic)  server-rendered on demand

Error: ENOENT: no such file or directory, lstat '/vercel/path0/.next/server/chunks/195.js.map'

I've created a minimal repo to reproduce this issue: https://github.com/ocavue/nextjs-sentry-vercel-deploy-issue

You can see from the GitHub webpage that the Vercel deployment failed after I enable deleteSourcemapsAfterUpload.

Expected Result

No error.

Actual Result

Vercel deployment fails, as shown above.

Product Area

Unknown

Link

No response

DSN

No response

Version

8.20.0

[getsantry]

Assigning to @getsentry/support for routing ⏲️

[ocavue]

It seems that when deleteSourcemapsAfterUpload is enable, all .js.map files under .next/ are deleted. (source code)

And based on the error message above, it seems that Vercel does need .next/server/chunks/195.js.map. Maybe we should only clean .map files under .next/static/.

[Lms24]

Hey @ocavue thanks for writing in and thanks for providing a reproduction! I'll take a look and report back.

[Lms24]

I can reproduce the issue on Vercel (but not locally, so just like you described). Talked a bit about this with @lforst - it's probably fine for us to only delete client-side source maps and not every source map. We'll fix this soon.