Repository: next.js
Issue: Code imported inside instrumentation.ts can't mutate imported modules
Labels: bug,Runtime,Instrumentation

### Link to the code that reproduces this issue

https://github.com/shkreios/next-js-instrumentation-bug-reproduction

### To Reproduce

1. Open the [codesandbox](https://codesandbox.io/p/github/shkreios/next-js-instrumentation-bug-reproduction/main?import=true&layout=%257B%2522sidebarPanel%2522%253A%2522EXPLORER%2522%252C%2522rootPanelGroup%2522%253A%257B%2522direction%2522%253A%2522horizontal%2522%252C%2522contentType%2522%253A%2522UNKNOWN%2522%252C%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522id%2522%253A%2522ROOT_LAYOUT%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522UNKNOWN%2522%252C%2522direction%2522%253A%2522vertical%2522%252C%2522id%2522%253A%2522cm0jrhq8100053b6ikn0p21gt%2522%252C%2522sizes%2522%253A%255B100%255D%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522EDITOR%2522%252C%2522direction%2522%253A%2522horizontal%2522%252C%2522id%2522%253A%2522EDITOR%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL%2522%252C%2522contentType%2522%253A%2522EDITOR%2522%252C%2522id%2522%253A%2522cm0jrhq8100023b6ig8egxvdf%2522%257D%255D%257D%252C%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522SHELLS%2522%252C%2522direction%2522%253A%2522horizontal%2522%252C%2522id%2522%253A%2522SHELLS%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL%2522%252C%2522contentType%2522%253A%2522SHELLS%2522%252C%2522id%2522%253A%2522cm0jrhq8100033b6iqqmal62q%2522%257D%255D%257D%255D%257D%252C%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522DEVTOOLS%2522%252C%2522direction%2522%253A%2522vertical%2522%252C%2522id%2522%253A%2522DEVTOOLS%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL%2522%252C%2522contentType%2522%253A%2522DEVTOOLS%2522%252C%2522id%2522%253A%2522cm0jrhq8100043b6ixl2b7wdp%2522%257D%255D%257D%255D%252C%2522sizes%2522%253A%255B50%252C50%255D%257D%252C%2522tabbedPanels%2522%253A%257B%2522cm0jrhq8100023b6ig8egxvdf%2522%253A%257B%2522tabs%2522%253A%255B%257B%2522id%2522%253A%2522cm0jrhq8100013b6ixhcnjd6m%2522%252C%2522mode%2522%253A%2522permanent%2522%252C%2522type%2522%253A%2522FILE%2522%252C%2522filepath%2522%253A%2522%252FREADME.md%2522%252C%2522state%2522%253A%2522IDLE%2522%257D%255D%252C%2522id%2522%253A%2522cm0jrhq8100023b6ig8egxvdf%2522%252C%2522activeTabId%2522%253A%2522cm0jrhq8100013b6ixhcnjd6m%2522%257D%252C%2522cm0jrhq8100043b6ixl2b7wdp%2522%253A%257B%2522id%2522%253A%2522cm0jrhq8100043b6ixl2b7wdp%2522%252C%2522activeTabId%2522%253A%2522cm0jrk5a9000g3b6igbd81nr3%2522%252C%2522tabs%2522%253A%255B%257B%2522type%2522%253A%2522SETUP_TASKS%2522%252C%2522id%2522%253A%2522cm0jrhrjn000p3b6i28okzqzk%2522%252C%2522mode%2522%253A%2522permanent%2522%257D%252C%257B%2522type%2522%253A%2522ENV_SETUP%2522%252C%2522id%2522%253A%2522cm0jrk5a9000g3b6igbd81nr3%2522%252C%2522mode%2522%253A%2522permanent%2522%257D%255D%257D%252C%2522cm0jrhq8100033b6iqqmal62q%2522%253A%257B%2522id%2522%253A%2522cm0jrhq8100033b6iqqmal62q%2522%252C%2522activeTabId%2522%253A%2522cm0jri4hx00153b6ivspu4uap%2522%252C%2522tabs%2522%253A%255B%257B%2522type%2522%253A%2522TASK_LOG%2522%252C%2522taskId%2522%253A%2522dev%2522%252C%2522id%2522%253A%2522cm0jri4hx00153b6ivspu4uap%2522%252C%2522mode%2522%253A%2522permanent%2522%257D%255D%257D%257D%252C%2522showDevtools%2522%253Atrue%252C%2522showShells%2522%253Atrue%252C%2522showSidebar%2522%253Afalse%252C%2522sidebarPanelSize%2522%253A15%257D)
2. Start the next dev server 
3. Open the app on http://localhost:3000
4. Click the request button
5. Inspect the logs see that the mutating of the store object inside instrumentation.ts has no effect to the imported store object inside api/update-store

### Current vs. Expected behavior

I would expect the code inside `instrumentation.ts` to be able to mutate the store object.
Console output
```log

// log from inside instrumentation.ts successfully setting the onUpdate prop on the store object
Store listener is ready { update: [Function: update], onUpdate: [Function (anonymous)] } 

log from inside the api/update-store/route.ts showing a different object which does not have the change 
{ update: [Function: update] } 

```

### Provide environment information

```bash
Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 23.6.0: Mon Jul 29 21:14:30 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T6000
  Available memory (MB): 32768
  Available CPU cores: 8
Binaries:
  Node: 20.17.0
  npm: 10.8.2
  Yarn: 1.22.19
  pnpm: 9.9.0
Relevant Packages:
  next: 15.0.0-canary.137 // Latest available version is detected (15.0.0-canary.137).
  eslint-config-next: N/A
  react: 19.0.0-rc-7771d3a7-20240827
  react-dom: 19.0.0-rc-7771d3a7-20240827
  typescript: 5.3.3
Next.js Config:
  output: N/A
```


### Which area(s) are affected? (Select all that apply)

Instrumentation, Runtime

### Which stage(s) are affected? (Select all that apply)

next dev (local), next start (local), Vercel (Deployed), Other (Deployed)

### Additional context
My main use case for this approach, as demonstrated in the example, is to attach listeners to the data layer once. A more complex scenario would involve attempting to share an `EventEmitter` object. However, it would be less obvious that the objects within instrumentation.ts and the API route are not identical.