webpack.common.js

const path = require('path');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: {
    app: ['react-hot-loader/patch', './src/index.js']
  },
  resolve: {
    alias: {
      src: path.resolve(__dirname, './src'),
      assets: path.resolve(__dirname, './assets')
    }
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: [
          { loader: 'react-hot-loader/webpack' },
          { loader: 'babel-loader' }
        ]
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        use: ['file-loader']
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(['dist']),
    new HtmlWebpackPlugin({
      template: path.resolve(__dirname, 'assets/index.html'),
      inject: 'body'
    })
  ],
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname, 'dist')
  }
};