webpack.config.js

const webpack = require('webpack');
const webpackMerge = require('webpack-merge');
const path = require('path');
const commonConfig = require('./webpack.config.common.js');
const AppCachePlugin = require('appcache-webpack-plugin');

module.exports = function(options) {
  const ENV = options.ENV || 'production';

  return webpackMerge(commonConfig, {
    plugins: [
      // new webpack.optimize.DedupePlugin(),
      new webpack.DefinePlugin({
        'ENV': JSON.stringify(ENV)
      }),
      new webpack.NoErrorsPlugin(),
      new webpack.optimize.UglifyJsPlugin({
        // beautify: true, //debug
        // mangle: false, //debug
        // dead_code: false, //debug
        // unused: false, //debug
        // deadCode: false, //debug
        // compress: {
        //   screw_ie8: true,
        //   keep_fnames: true,
        //   drop_debugger: false,
        //   dead_code: false,
        //   unused: false
        // }, // debug
        // comments: true, //debug
        beautify: false, //prod
        mangle: {
          screw_ie8: true,
          keep_fnames: true // required for ng2 rc.5
        }, //prod
        compress: { //prod
          screw_ie8: true,
          warnings: false
        },
        comments: false //prod
      }),
      new AppCachePlugin({
        exclude: ['app.js', 'styles.css'],
        output: 'app.appcache'
      })
    ]
  });
};