webpack.config.js

const webpack = require('webpack');

const config = {
  entry: {
    index: ["./src/index.js"]
  },
  output: {
    path: __dirname + '/lib',
    filename: "[name].js",
    libraryTarget: "umd",
    library: "react-precache-img",
  },
  externals: {
   "react": {
      root: 'React',
      commonjs2: 'react',
      commonjs: 'react',
      amd: 'react'
    },
    "react-dom": {
      root: 'ReactDOM',
      commonjs: 'react-dom',
      commonjs2: 'react-dom',
      amd: 'react-dom'
    }
  },
  module: {
    loaders: [{
      test: /.jsx?$/,
      exclude: /node_modules/,
      loader: "babel",
      query: {
        presets: ["es2015","react","stage-0"]
      }
    }]
  },
  plugins: [
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({comments: false}),
    new webpack.DefinePlugin({
      'process.env': {NODE_ENV: JSON.stringify('production')}
    })
  ],
};

module.exports = config;