next > 13.4.10 too aggressive tree shaking

[Torsten85]

Verify canary release

• I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
      Platform: darwin
      Arch: arm64
      Version: Darwin Kernel Version 22.5.0: Thu Jun  8 22:22:20 PDT 2023; root:xnu-8796.121.3~7/RELEASE_ARM64_T6000
    Binaries:
      Node: 19.6.0
      npm: 9.4.0
      Yarn: N/A
      pnpm: 8.5.0
    Relevant Packages:
      next: 13.4.9
      eslint-config-next: N/A
      react: 18.2.0
      react-dom: 18.2.0
      typescript: N/A
    Next.js Config:
      output: N/A

Which area(s) of Next.js are affected? (leave empty if unsure)

webpack optimization I guess

Link to the code that reproduces this issue or a replay of the bug

https://github.com/Torsten85/next-13-4-10-tree-shaking-bug

To Reproduce

run pnpm i && pnpm test, see the error (13.4.13-canary.5)
run git checkout downgrade && pnpm i && pnpm test, see no error (13.4.9)

Describe the Bug

SWC minify removes a used chunk of code from a dependency, resulting in a production error

Expected Behavior

the bundling process should correctly determine that the code block is referenced and in use

Which browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

No response

[icyJoseph]

This is an SWC issue. AFAIK, it has already been reported upstream to the SWC repository.

• Constant being removed in production build. #53096
• Object properties are incorrectly erased when using hoist_props swc-project/swc#7710
• The consts was removed in the latest version。 swc-project/swc#7700

[Torsten85]

Seems like it, but I get the same result with swcMinify: false

[icyJoseph]

Really? There was a repository on one of those issues, and it worked with minify turned off. Mmm 🤔 yours uses app router, wonder if that changes things. Could you try with pages router?

[Torsten85]

Sorry, I was wrong, swcMinify: false did prevent the error.

[kdy1]

This will be fixed by swc-project/swc#7702

[github-actions]

This closed issue has been automatically locked because it had no new activity for 2 weeks. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.