Next.js bundles libraries only used in Server Components into the Client Bundle Chunks

[phryneas]

Link to the code that reproduces this issue

https://github.com/phryneas/apollo-client-nextjs-reproduction-341

To Reproduce

The reproduction is a blank create repo created with yarn create next-app - all differences to a new repo are in this commit

1. npm install
2. npm run build
3. grep -rl watchQuery .next/static/chunks -> .next/static/chunks/959-17277ce4ae2a5d3b.js (watchQuery is an Apollo Client api, so it's easily identifiable by that even when class names are mangled)
4. npm run start
5. open http://localhost:3000 in the browser
6. verify that 959-17277ce4ae2a5d3b.js is indeed sent to the browser

Current vs. Expected behavior

Apollo Client should not end up in the Client Chunks when only referenced from Server Components.

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 23.5.0: Wed May  1 20:12:58 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T6000
  Available memory (MB): 16384
  Available CPU cores: 8
Binaries:
  Node: 22.6.0
  npm: 10.8.2
  Yarn: 1.22.22
  pnpm: N/A
Relevant Packages:
  next: 14.2.5 // Latest available version is detected (14.2.5).
  eslint-config-next: N/A
  react: 18.3.1
  react-dom: 18.3.1
  typescript: N/A
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

SWC

Which stage(s) are affected? (Select all that apply)

next build (local), next start (local)

Additional context

This was brought to our attention in apollographql/apollo-client-nextjs#341