Sentry causes Next.js 16 build to fail when using standalone output

[tiagoskaneta]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/nextjs

SDK Version

10.21.0

Framework Version

Next.js 16

Link to Sentry event

No response

Reproduction Example/SDK Setup

No response

Steps to Reproduce

1. Create a new nextjs 16 project - I believe the issue only occurs when using the Page router but cannot confirm
2. Configure sentry using the wizard
3. Add a proxy.ts to the project (the example code https://nextjs.org/docs/app/getting-started/proxy should suffice)
4. Change the next.config.ts to

const nextConfig: NextConfig = {
  output: 'standalone',
};

5. npm run build

Expected Result

Build should succeed

Actual Result

> Build error occurred
Error: ENOENT: no such file or directory, copyfile 'test-sentry/.next/server/proxy.js' -> 'test-sentry/.next/standalone/.next/server/proxy.js'
    at ignore-listed frames {
  errno: -2,
  code: 'ENOENT',
  syscall: 'copyfile',
  path: 'test-sentry/.next/server/proxy.js',
  dest: 'test-sentry/.next/standalone/.next/server/proxy.js'
}

Additional Context

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[linear]

JS-1079

[andreiborza]

Hi @tiagoskaneta, thanks for filing this.

@chargome could you please take a look?

[chargome]

@tiagoskaneta can't reproduce this.

Here's a reproduction repo: https://github.com/chargome/repro.next-16-standalone

Feel free to open a PR in this repo where you reproduce the behaviour you're describing!

[tiagoskaneta]

@chargome thanks for checking. can you try with next build --webpack, as the default now for nextjs 16 seems to be turbopack.