vscode cannot support postcss

[GuihaiHU]

• [*] I searched through existing issues.
• [*] I have looked through docs at https://vuejs.github.io/vetur/

Info

• Platform: Linux
• Vetur version:0.9.3
• VSCode version:1.14.2

Problem

I write my Vue project by VScode in Linux.There is a postcss.config.js in my workspace.

And it works well when I build. However, My VScode are complaining that I don't write postcss correctly as follow:

[HerringtonDarkholme]

Vetur doesn't support postcss nesting. But you can use other postcss features like custom-property and @apply.

You can turn off style validation by configure option. vetur.validation.style. https://github.com/vuejs/vetur/blob/master/package.json#L133

More info and reasoning: microsoft/vscode#3907 (comment)

Broadly speaking, we will keep pace with vscode team.