[turbopack] tailwindcss not working with --turbo on dev

[RubenSmn]

Link to the code that reproduces this issue

https://github.com/RubenSmn/turbopack-tailwindcss-dev-bug

To Reproduce

1. pnpx create-next-app
2. accept all defaults
3. add --turbo to next dev in package.json like mentioned in add turbopack to existing project
4. pnpm run dev
5. go to the server and see that tailwindcss class styles are not applied

or

1. pnpx create-next-app --example with-turbopack
2. add tailwindcss following the Install Tailwind CSS with Next.js
   guide (all the way to step 6)
3. pnpm run dev
4. go to the server and see that tailwindcss class styles are not applied

Current vs. Expected behavior

Current Behavior
The tailwindcss styles from the classes, e.g. (font-bold, underline), are not applied when running next dev with the --turbo flag. When running the dev server without the turbo flag all styles are applied correctly.

Expected Behavior
The styles are applied when running next dev with the --turbo flag.

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #123~20.04.1-Ubuntu SMP Wed Jun 12 17:33:13 UTC 2024
  Available memory (MB): 15733
  Available CPU cores: 8
Binaries:
  Node: 18.19.0
  npm: 10.2.3
  Yarn: 1.22.19
  pnpm: 8.6.12
Relevant Packages:
  next: 14.2.4 // Latest available version is detected (14.2.4).
  eslint-config-next: N/A
  react: 18.2.0
  react-dom: 18.2.0
  typescript: 5.2.2

  autoprefixer: ^10.4.19
  postcss: ^8.4.39
  tailwindcss: ^3.4.4

Next.js Config:
  output: N/A

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

Turbopack

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

next dev (local)

Additional context

No response

[N1ve5h]

@RubenSmn I created a fork with the fix. The issue was that autoprefixer was not listed in your package.json nor in pnpm-lock.yaml

[mirasayon]

I have no idea how it happened that this doesn't work for you. But I copied your repository and everything works for me without any problems. It works with pnpm too:

[timneutkens]

Going to close this as @N1ve5h's reply is correct 👍