nuxt 运行报错 WARN You did not set any plugins, parser, or stringifier. Right now 解决方法

nuxtjs 运行报错
WARN You did not set any plugins, parser, or stringifier. Right now, PostCSS does nothing. Pick plugins for your case on https://www.postcss.parts/ and use them in postcss.config.js.

这个警告虽然不影响代码运行，但是很烦人，在 nuxt.conf.js 中加入

build: {
  postcss: null
}

这样可以正常运行了