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

9.30.0

Framework Version

Nextjs 15.3.3

Link to Sentry event

No response

Reproduction Example/SDK Setup

While reviewing the sentry/nextjs code in the search of a potential bug I stumbled upon this line of code:

For a quick overview:

  const potentialInstrumentationClientFileLocations = [
    ['src', 'instrumentation-client.ts'],
    ['src', 'instrumentation-client.js'],
    ['instrumentation-client.ts'],
    ['instrumentation-client.ts'], <-- This must be `.js`
  ];

Steps to Reproduce

See example

Expected Result

That instrumentation-client.js are also 'seen' by the sentry webpack code.

Actual Result

instrumentation-client.js is not scanned.