webpack.common.js

const path = require('path');
const webpack = require('webpack');
const dotenv = require('dotenv').config({ path: '.env' });

module.exports = {
  entry: {
    main: './src/index.js',
    vendor: [
      'react',
      'react-dom',
      'prop-types',
      'react-redux',
      'redux',
      'redux-thunk',
      'reselect',
      'react-color'
    ]
  },
  output: {
    path: path.resolve(__dirname, 'build'),
    filename: 'js/[name].js'
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
      {
        test: /\.html$/,
        loader: 'html-loader'
      },
      {
        test: /\.(png|jpe?g|gif|svg|woff|woff2|eot|ttf|wav|mp3|ico)$/,
        use: {
          loader: 'file-loader',
          options: {
            name: '[name].[hash].[ext]',
            outputPath: 'img'
          }
        }
      }
    ]
  },
  resolve: {
    modules: [path.resolve('./src'), path.resolve('./node_modules')],
    extensions: ['.js', '.jsx']
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': JSON.stringify(dotenv.parsed)
    })
  ]
};