webpack.config.js

var webpack = require('webpack');
var path = require('path');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var autoprefixer = require('autoprefixer');

var env = process.env.NODE_ENV;

module.exports = {
  entry: './src/index',
  output: {
    library: 'reactWordcloud',
    libraryTarget: 'umd',
  },
  resolveLoader: {
    root: path.join(__dirname, 'node_modules'),
  },
  resolve: {
    extensions: ['', '.js'],
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        loader: 'babel',
        include: path.join(__dirname, 'src'),
      },
      {
        test: /\.css$/,
        loader: ExtractTextPlugin.extract('style-loader', 'css-loader!postcss-loader'),
      },
    ],
  },
  postcss: [autoprefixer({ browsers: ['last 3 versions'] })],
  plugins: [
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify(env),
    }),
    new ExtractTextPlugin('wordcloud.min.css'),
  ],
  externals: {
    react: {
      root: 'React',
      commonjs2: 'react',
      commonjs: 'react',
      amd: 'react',
    },
    'babel-polyfill': 'babel-polyfill',
    'normalize.css': 'normalize.css',
  },
};

if (env === 'production') {
  module.exports.plugins.push(
    new webpack.optimize.UglifyJsPlugin({
      compressor: {
        pure_getters: true,
        unsafe: true,
        unsafe_comps: true,
        screw_ie8: true,
        warnings: false,
      },
    })
  );
}