webpack.config.js

const path = require('path');
const webpack = require('webpack');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

const env = process.env.NODE_ENV;

const config = {
  entry: './src/index.js',

  output: {
    path: path.resolve(__dirname, 'umd'),
    library: 'Recharts',
    libraryTarget: 'umd',
  },

  module: {
    rules: [{
      test: /\.(js|jsx)$/,
      exclude: /node_modules/,
      include: [
        path.resolve(__dirname, 'src'),
      ],
      use: {
        loader: 'babel-loader',
        query: {
          plugins: ['lodash'],
        },
      }
    }],
  },

  externals: {
    react: {
      root: 'React',
      commonjs2: 'react',
      commonjs: 'react',
      amd: 'react',
    },
    'react-dom': {
      root: 'ReactDOM',
      commonjs2: 'react-dom',
      commonjs: 'react-dom',
      amd: 'react-dom'
    },
    'prop-types': {
      root: 'PropTypes',
      commonjs2: 'prop-types',
      commonjs: 'prop-types',
      amd: 'prop-types',
    },
  },

  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify(env),
    }),
  ],
};

if (env === 'analyse') {
  config.plugins.push(
    new BundleAnalyzerPlugin()
  );
}

if (env === 'development') {
  config.mode = 'development';
  config.devtool = 'source-map';
}

if (env === 'production') {
  config.mode = 'production';
}

module.exports = config;