Missing Ecmascript features in webpack

[timneutkens]

Link to the code that reproduces this issue

https://github.com/vercel/next.js/pull/65613/files

To Reproduce

The tests are already added but not all of them are enabled for webpack as webpack fails to parse them in the acorn parse that webpack does.

You can search for TODO: here: https://github.com/vercel/next.js/pull/65613/files

Current vs. Expected behavior

These features should be supported when using webpack.

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 23.4.0: Wed Feb 21 21:44:43 PST 2024; root:xnu-10063.101.15~2/RELEASE_ARM64_T6000
  Available memory (MB): 32768
  Available CPU cores: 10
Binaries:
  Node: 18.17.1
  npm: 9.6.7
  Yarn: N/A
  pnpm: 8.15.7
Relevant Packages:
  next: 14.3.0-canary.54 // There is a newer canary version (14.3.0-canary.57) available, please upgrade!
  eslint-config-next: 14.3.0-canary.54
  react: 19.0.0-beta-4508873393-20240430
  react-dom: 19.0.0-beta-4508873393-20240430
  typescript: 5.3.3
Next.js Config:
  output: N/A

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

Webpack

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

next dev (local), next build (local)

Additional context

No response

[github-actions]

We could not detect a valid reproduction link. Make sure to follow the bug report template carefully.

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I did not open this issue, but it is relevant to me, what can I do to help?

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Useful Resources

• How to Contribute to Open Source (Next.js)
• How to create a Minimal, Complete, and Verifiable example
• Reporting a Next.js bug
• Next.js Triaging issues