`postcss` option is not working after v14.0.2

[weizhenye]

Version

14.1.1

Reproduction link

https://gist.github.com/weizhenye/2288bcf2854f4ae38f5ba604548fabd3

Steps to reproduce

1. Download this gist ZIP
2. npm i
3. npm i vue-loader@14.0.1
4. npm run build
5. Open dist/style.css
6. npm i vue-loader@14.0.2
7. npm run build
8. Open dist/style.css

What is expected?

The nesting syntax should be compiled by PostCSS

What is actually happening?

postcss: [cssnext()] in webpack.config.js is not working in 14.0.2 (and also v14.1.1)

---

It might be caused by this commit

[blake-newman]

I have found this to be an issue with cssnext, for a while. At my workplace we have a React app also with same issue. Havn't explored to deeply, however you can resolve this simply adding https://github.com/postcss/postcss-nested, this plugin seems to work much better than that provided by the cssnext tooling.

[weizhenye]

@blake-newman
No, it's not about cssnext, it is an issue with vue-loader.
Any other conditions are same, the only difference is update vue-loader from v14.0.1 to v14.0.2, and then all plugins in postcss option is not working.
I just install postcss-nested and replace config with postcss: [require('postcss-nested')()], it still not work.
You can reproduce it with above steps.

[jarrodldavis]

I’m having the same issue, even when using postcss.config.js instead of the inline config in webpack. Downgrading to 14.0.1 also fixes the problem for me.

Edit: Hmm I guess something was off because the external config works for me now.

[sscharfenberg]

Same problem here.
Setup is similar, instead of cssnext I use postcss-flexbugs-fixes, autoprefixer and cssnano - none of them are applied with vue-loader@14.1.1.

[yyx990803]

Should be fixed in 905b813