Next.js middleware sourcemaps built to from .next/server/src missing

[meyer9]

Is there an existing issue for this?

• I have reviewed the documentation https://docs.sentry.io/
• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• 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

7.60.0

Framework Version

Next.js 13.4.9

Link to Sentry event

https://placepull.sentry.io/discover/mercury:343d9d59ead7441bb0f30872747d2b9a/?field=title&field=release&field=environment&field=user.display&field=timestamp&name=Error%3A+this+is+a+test+error+2&project=5662046&query=issue%3AMERCURY-8AN&sort=-timestamp&statsPeriod=90d&yAxis=count%28%29

SDK Setup

/**
 * @type {Partial<import("@sentry/nextjs").SentryWebpackPluginOptions>}
 */
const SentryWebpackPluginOptions = {
  deploy: SENTRY_ENABLED
    ? {
        env: SENTRY_ENV,
      }
    : undefined,
  release: NEXT_PUBLIC_COMMIT_SHA,
  env: SENTRY_ENV,
  authToken: SENTRY_AUTH_TOKEN,
  finalize: !SENTRY_ENABLED,
  dryRun: !SENTRY_ENABLED,
  hideSourceMaps: true,
  silent: NODE_ENV !== 'production',
}

Steps to Reproduce

1. Trigger an error in NextJS middleware.

Error: this is a test error 2
    at Object.middleware$1 (file:///Users/work/development/app/.next/server/src/middleware.js:8544:15)
    at Object.<anonymous> (file:///Users/work/development/app/.next/server/src/middleware.js:8344:49)
    at Object.apply (file:///Users/work/development/app/.next/server/src/middleware.js:8424:16)
    at adapter (file:///Users/work/development/app/.next/server/src/middleware.js:1250:33)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)

2. Notice the stack trace in Sentry includes an error about absolute URLs

Expected Result

Source map should shows up in Sentry.

Actual Result

The abs_path of the stack frame is /Users/work/development/app/.next/server/src/middleware.js which is not a valid URL. Read our docs for troubleshooting help.

From this code: https://github.com/getsentry/sentry-javascript/blob/develop/packages/nextjs/src/config/webpack.ts#L627-L634

It seems like .next/server/src is not included.

[Lms24]

Hi @meyer9 thanks for writing in and for investigating! I believe your suspicion might be correct but I'm lacking context around NextJS middleware so I'm not sure if there are other things to consider. Since you've already come so far in debugging this, you could give adding the missing directory a try (for instance by directly modifying the file in your node modules or by cloning the repo) and see if it resolves the issue for you. Regardless though, we need to investigate this.

@lforst - when you're back, mind taking a look at this?