webpackでPostCSSを使ってSassをコンパイルする設定 ref: http://qiita.com/kenichi_odo/items/308328e78737756795e2

file0.txt

sudo npm i --save-dev postcss-loader sugarss precss autoprefixer

file1.js

import autoprefixer from 'autoprefixer';
import precss from 'precss';

file2.js

{
  module: {
    loaders: [
      {
        test: /\.sass$/,
        loaders: ['style', 'css', 'postcss?parser=sugarss'],
      },
    ],
  },
  postcss: [autoprefixer({ browsers: ['IE 9', 'IE 10', 'IE 11', 'last 2 versions'] }), precss],
}