old_contents: const path = require('path')
  const ProgressBarPlugin = require('progress-bar-webpack-plugin')
  const webpack = require('webpack')
  
  const SRC = path.join(process.cwd(), 'app')
  const BUILD = path.join(process.cwd(), 'build')
  
  // dev
  module.exports = {
      entry: [
          'react-hot-loader/patch',
          'webpack-hot-middleware/client',
          path.join(SRC, 'index.jsx'),
      ],
      output: {
          path: BUILD,
          publicPath: '/',
          filename: '[name].js',
          chunkFilename: '[name].chunk.js',
      },
      module: {
          rules: [
              {
                  test: /\.jsx?$/,
                  use: 'babel-loader',
              },
          ],
      },
      resolve: {
          modules: [ 'app', 'node_modules' ],
          extensions: [ '.js', '.jsx' ],
          alias: {
              ACTIONS: path.join(SRC, 'redux/actions'),
              REDUCERS:path.join(SRC, 'redux/reducers'),
              STORE:path.join(SRC, 'redux/store'),
          }
      },
      devtool: 'cheap-module-eval-source-map',
      plugins: [
          new ProgressBarPlugin(),
          new webpack.DefinePlugin({
              __PRODUCTION__: JSON.stringify(process.env.NODE_ENV === 'production')
          }),
          new webpack.HotModuleReplacementPlugin(),
      ],
  }
  
new_contents: const path = require('path')
  const ProgressBarPlugin = require('progress-bar-webpack-plugin')
  const webpack = require('webpack')
  
  const SRC = path.join(process.cwd(), 'app')
  const BUILD = path.join(process.cwd(), 'build')
  
  // dev
  module.exports = {
      entry: [
          'react-hot-loader/patch',
          'webpack-hot-middleware/client',
          path.join(SRC, 'index.jsx'),
      ],
      output: {
          path: BUILD,
          publicPath: '/',
          filename: '[name].js',
          chunkFilename: '[name].chunk.js',
      },
      module: {
          rules: [
              {
                  test: /\.jsx?$/,
                  use: 'babel-loader',
              },
          ],
      },
      resolve: {
          modules: [ 'app', 'node_modules' ],
          extensions: [ '.js', '.jsx' ],
          alias: {
              ACTIONS: path.join(SRC, 'redux/actions'),
              REDUCERS: path.join(SRC, 'redux/reducers'),
              STORE: path.join(SRC, 'redux/store'),
              COMPONENTS: path.join(SRC, 'components'),
          }
      },
      devtool: 'cheap-module-eval-source-map',
      plugins: [
          new ProgressBarPlugin(),
          new webpack.DefinePlugin({
              __PRODUCTION__: JSON.stringify(process.env.NODE_ENV === 'production')
          }),
          new webpack.HotModuleReplacementPlugin(),
      ],
  }
  
subject: Add components alias.