webpack.config.js

var path = require('path');
var webpack = require('webpack');
var UglifyJsPlugin = webpack.optimize.UglifyJsPlugin;
//var env = require('yargs').argv.mode;
var libraryName = 'redux-saga-process';
var plugins = [],
  outputFile;
const BabiliPlugin = require('babili-webpack-plugin');
const NodeExternals = require('webpack-node-externals');

console.log('Env: ', process.env.NODE_ENV);
if (process.env.NODE_ENV === 'production') {
  // plugins.push(
  //   new webpack.optimize.UglifyJsPlugin({
  //     sourceMap: false,
  //     compress: {
  //       screw_ie8: true,
  //       warnings: false,
  //     },
  //     mangle: {
  //       screw_ie8: true,
  //     },
  //     output: {
  //       comments: false,
  //       screw_ie8: true,
  //     },
  //   }),
  // );
  outputFile = libraryName + '.min.js';
  plugins.push(
    new webpack.LoaderOptionsPlugin({
      minimize: true,
    }),
  );
  plugins.push(
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': process.env.NODE_ENV,
    }),
  );
} else {
  outputFile = libraryName + '.js';
}

module.exports = {
  entry: [
    path.resolve(__dirname, './src/statics.js'),
    path.resolve(__dirname, './src/main.js'),
  ],

  // target: 'async-node',

  devtool: process.env.NODE_ENV !== 'production' && 'source-map',

  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'redux-saga-process.js',
    library: libraryName,
    libraryTarget: 'umd',
    umdNamedDefine: true,
  },

  resolve: {
    modules: ['node_modules'],
  },

  plugins: plugins,

  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        include: [path.resolve(__dirname, './src')],
        use: [
          {
            loader: 'babel-loader',
            options: {
              babelrc: false,
              plugins: ['transform-class-properties'],
              presets: [
                [
                  'env',
                  {
                    modules: false,
                    targets: {
                      browsers: ['last 2 Chrome versions'],
                      node: 'current',
                    },
                  },
                ],
                'stage-0',
              ],
              env: {
                production: {
                  presets: ['babili'],
                },
              },
            },
          },
        ],
      },
    ],
  },

  externals: [NodeExternals()],
};