webpack.common.js

const path = require('path');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');

module.exports = {
  entry: './src/index.js',

  module: {
    rules: [
      {
        test: /\.js$/,
        use: 'babel-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [
            {
              loader: 'css-loader',
              options: {
                importLoaders: 1,
                url: false,
              },
            },
            {
              loader: 'postcss-loader',
              options: {
                sourceMap: 'inline',
              },
            },
          ],
        }),
      },
    ],
  },

  resolve: {
    extensions: ['.js', '.css'],
  },

  plugins: [
    new ExtractTextPlugin('[name].css'),
    new CopyWebpackPlugin([{ from: 'images/*', to: 'dist' }]),
  ],

  devtool: 'inline-source-map',

  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'story', 'assets'),
  },
};