Postcss Webpack Config

webpack.config.css.js

var webpackConfig = require('./webpack.config');
var ExtractTextPlugin = require("extract-text-webpack-plugin");

module.exports = {
	entry : './src/style.js',
	output : {
		filename : 'style.js',
		path : './docs'
	},
	module : {
		loaders : [
			{
				test : /\.css/,
				loader:  ExtractTextPlugin.extract('style-loader', ['css-loader', 'postcss-loader', 'sass-loader'])
			}
		]
	},
	plugins: [
		new ExtractTextPlugin("style.css")
	],
	postcss: function (webpack) {
		return [
			require('precss')(),
			require('postcss-bem')({
				separators : {
					descendent : '_',
					modifier : '-'
				}
			}),
			require('postcss-calc')(),
			require("postcss-import")(),
			require("postcss-url")(),
			require("postcss-nested")(),
			require("postcss-cssnext")(),
			require('postcss-utilities')()
			// require('cssnano')()
		]
	}
}