@sentry/nextjs v8.49.0 deletes sourcemap files by default, disregards sourcemaps.deleteFilesAfterUpload:false, causes next-sitemap to fail during build

[jqrd]

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

8.49.0

Framework Version

Next 15.1.5

Link to Sentry event

No response

Reproduction Example/SDK Setup

// Sentry init
Sentry.init({
 dsn: process.env.NEXT_PUBLIC_SENTRY_DSN,
 environment: process.env.NEXT_PUBLIC_SENTRY_ENVIRONMENT,
 tracesSampleRate: process.env.NEXT_PUBLIC_SENTRY_TRACES_SAMPLE_RATE_FLOAT
 ? parseFloat(process.env.NEXT_PUBLIC_SENTRY_TRACES_SAMPLE_RATE_FLOAT)
 : 0.01,
});

// Next config using withSentryConfig
module.exports = withSentryConfig(nextConfig, {
 org: 'orgName',
 project: 'products',

 // Only print logs for uploading source maps in CI
 silent: !process.env.CI,

 // Upload a larger set of source maps for prettier stack traces (increases build time)
 widenClientFileUpload: true,

 // Hides source maps from generated client bundles
 hideSourceMaps: true,

 // Automatically tree-shake Sentry logger statements to reduce bundle size
 disableLogger: true,

 // also fails without this whole section being present, and it also used to work without it being there at all
 sourcemaps: {
 // Ensure sourcemaps are left behind by Sentry so that next-sitemap can use them
 deleteSourcemapsAfterUpload: false,
 },
});

Steps to Reproduce

Set up a Next project with Sentry integration.

Add next-sitemap as a dependency, e.g. pnpm add next-sitemap / npm install next-sitemap.

Add a next-sitemap.config.js file:

module.exports = {
 siteUrl: 'https://www.example.com',
 generateIndexSitemap: false,
 sitemapSize: 1000000,
};

Add a postbuild step in package.json:

 "postbuild": "next-sitemap",

Set a valid SENTRY_DSN env variable value and run pnpm build / npm build.

Expected Result

Postbuild step succeeds in generating the sitemap -- this is working on v8.48.0

Actual Result

Error in postbuild step:

...
11:20:08 AM: products:build: [@sentry/nextjs - Node.js] Info: Successfully uploaded source maps to Sentry
11:20:08 AM: products:build: 
11:20:08 AM: products:build: > products@0.1.0 postbuild /opt/build/repo/apps/products
11:20:08 AM: products:build: > next-sitemap
11:20:08 AM: products:build: 
11:20:08 AM: products:build: ✨ [next-sitemap] Loading next-sitemap config: file:///opt/build/repo/apps/products/next-sitemap.config.js
11:20:08 AM: products:build: ❌ [next-sitemap] Unable to find build-manifest.
11:20:08 AM: products:build: Make sure to build the project using `next build` command
11:20:08 AM: products:build: 
11:20:08 AM: products:build: ❌ [next-sitemap] undefined
...

[jqrd]

There seems to be one recent change in the area, from the title it seems to be specifically for sveltekit but I haven't dug into it: #14963

[lforst]

Hi, I cannot reproduce what you are describing. Would you mind sharing a reproduction repo we could pull to look at this?

[jqrd]

Apologies, when trying to narrow this down further it seems like we also upgraded @sentry/webpack-plugin from 2.23.0 to 3.0.0, and that may be actual cause of the issue. I'll file a separate issue when I can confirm this.