webpack.config.js

'use strict'
const webpack = require('webpack')
const LodashModuleReplacementPlugin = require('lodash-webpack-plugin')

const env = process.env.NODE_ENV

module.exports = {
  externals: {
    react: {
      root: 'React',
      commonjs2: 'react',
      commonjs: 'react',
      amd: 'react'
    },
    redux: {
      root: 'Redux',
      commonjs2: 'redux',
      commonjs: 'redux',
      amd: 'redux'
    },
    'react-redux': {
      root: 'ReactRedux',
      commonjs2: 'react-redux',
      commonjs: 'react-redux',
      amd: 'react-redux'
    },
    immutable: {
      root: 'Immutable',
      commonjs2: 'immutable',
      commonjs: 'immutable',
      amd: 'immutable'
    }
  },
  devtool: env === 'production' ? 'source-map' : false,
  mode: env === 'production' ? 'production' : 'development',
  module: {
    rules: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      }
    ]
  },
  output: {
    library: 'ReduxForm',
    libraryTarget: 'umd'
  },
  plugins: [
    new LodashModuleReplacementPlugin(),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify(env)
    })
  ]
}