webpack.config.prod.js

const path = require('path');
const webpack = require('webpack');

module.exports = {
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    libraryTarget: 'umd',
    filename: 'index.js',
    library: 'react-datepicker2'
  },

  plugins: [
    // Add only en and fa locale files of moment
    new webpack.ContextReplacementPlugin(/moment[\/\\]locale$/, /en|fa/),
    // new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
  ],

  externals: {
    'react': {
      'commonjs': 'react',
      'commonjs2': 'react',
      'amd': 'react',
      // React dep should be available as window.React, not window.react
      'root': 'React'
    },
    'react-dom': {
      'commonjs': 'react-dom',
      'commonjs2': 'react-dom',
      'amd': 'react-dom',
      'root': 'ReactDOM'
    }
  },
  module: {
    loaders: [
      {
        test: /\.(js|jsx)$/, loader: 'babel-loader', exclude: /node_modules/, query: {
          plugins: ['transform-runtime'],
          presets: ['es2015', 'stage-0', 'react'],
        }
      }
    ]
  }
}