postcss-loader: You did not set any plugins, parser, or stringifier. Right now, PostCSS does nothing.

in the nuxt.config.js file
build: { postcss: null, },

If you are on Nuxt.js and just want to remove the anoying warning, this will solve:

https://github.com/webpack-contrib/postcss-loader/issues/405

If you have the same problem, i’ve found an explication/solution here : https://github.com/postcss/postcss/issues/1247

As an aside, I have discovered that despite a valid (webpack) postcss-loader configuration with plugins present, from what I can tell postcss-advanced-variables will cause this error to be emitted since it apparently invokes postcss internally without plugins; I’m not sure if this is a bug per se, or whether there is some way to refrain from warning when explicitly invoked like this.

https://github.com/jonathantneal/postcss-advanced-variables/blob/master/src/lib/transform-import-atrule.js#L75

it is due module hoist in monorepos and default cwd…

In my case, changing the value of plugins property from function to array has solved the issue.

Before:

module.exports = {
  plugins: () => [
    require('postcss-preset-env'),
    require('cssnano'),
  ],
};

After:

module.exports = {
  plugins: [
    require('postcss-preset-env'),
    require('cssnano'),
  ],
};

Seems like people have different experience on this, I just want to share mine.

I meet the same problem when I use autoprefixer plugin. I tried many solutions I’ve found by Google , none of they woked. But ironically, it’s just beacuse I just wrote plugin rather plugins in postcss.config.js.

I was getting this warning in my NX workspace . I don’t know how to find the webpack in my NX workspace and post config.css , I tried creating a webpack.conf.js and post.config.js but didn’t solved my problem . Can anyone guide me on this ?

This is my project structure

Is it possible to get more of a stack trace for this error? I’m getting it now but everything seems to be working correctly otherwise. I presume it’s some other dependency somewhere in the tree.

Because you do not have plugins for postcss-loader, it is error from postcss