Example webpack config file with css loader and dev server proxy.

webpack.config.js

module.exports = {
  entry: "./entry.js",
  output: {
    path: __dirname,
    filename: "bundle.js"
  },
  devServer: {
    proxy: {
      '/api/*': 'https://my.backend.local'
    }
  },
  module: {
    loaders: [
      { test: /\.css$/, loader: "style!css" }
    ]
  }
};