text: // Helper: root(), and rootDir() are defined at the bottom
  var path = require('path');
  var webpack = require('webpack');
  
  // Webpack Plugins
  var CommonsChunkPlugin = webpack.optimize.CommonsChunkPlugin;
  var autoprefixer = require('autoprefixer');
  var HtmlWebpackPlugin = require('html-webpack-plugin');
  var ExtractTextPlugin = require('extract-text-webpack-plugin');
  var CopyWebpackPlugin = require('copy-webpack-plugin');
  
  /**
   * Env
   * Get npm lifecycle event to identify the environment
   */
  var ENV = process.env.npm_lifecycle_event;
  var isTest = ENV === 'test' || ENV === 'test-watch';
  var isProd = ENV === 'build';
  
  module.exports = function makeWebpackConfig() {
    /**
     * Config
     * Reference: http://webpack.github.io/docs/configuration.html
     * This is the object where all configuration gets set
     */
    var config = {};
  
    /**
     * Devtool
     * Reference: http://webpack.github.io/docs/configuration.html#devtool
     * Type of sourcemap to use per build type
     */
    if (isTest) {
      config.devtool = 'inline-source-map';
    } else if (isProd) {
      config.devtool = 'source-map';
    } else {
      config.devtool = 'eval-source-map';
    }
  
    // add debug messages
    config.debug = !isProd || !isTest;
  
    /**
     * Entry
     * Reference: http://webpack.github.io/docs/configuration.html#entry
     */
    config.entry = isTest ? {} : {
      'polyfills': ['es6-shim/es6-shim.js', 'angular2/bundles/angular2-polyfills'],
      'vendor': './src/vendor.ts',
      'app': './src/bootstrap.ts' // our angular app
    };
  
    /**
     * Output
     * Reference: http://webpack.github.io/docs/configuration.html#output
     */
    config.output = isTest ? {} : {
      path: root('dist'),
      publicPath: isProd ? '/' : 'http://localhost:8080/',
      filename: isProd ? 'js/[name].[hash].js' : 'js/[name].js',
      chunkFilename: isProd ? '[id].[hash].chunk.js' : '[id].chunk.js'
    };
  
    /**
     * Resolve
     * Reference: http://webpack.github.io/docs/configuration.html#resolve
     */
    config.resolve = {
      cache: !isTest,
      root: root(),
      // only discover files that have those extensions
      extensions: ['', '.ts', '.js', '.json', '.css', '.scss', '.html'],
      alias: {
        'app': 'src/client',
        'common': 'src/common'
      }
    };
  
    /**
     * Loaders
     * Reference: http://webpack.github.io/docs/configuration.html#module-loaders
     * List: http://webpack.github.io/docs/list-of-loaders.html
     * This handles most of the magic responsible for converting modules
     */
    config.module = {
      preLoaders: isTest ? [] : [{test: /\.ts$/, loader: 'tslint'}],
      loaders: [
        // Support for .ts files.
        {
          test: /\.ts$/,
          loader: 'ts',
          query: {
            'ignoreDiagnostics': [
              2403, // 2403 -> Subsequent variable declarations
              2300, // 2300 -> Duplicate identifier
              2374, // 2374 -> Duplicate number index signature
              2375, // 2375 -> Duplicate string index signature
              2502  // 2502 -> Referenced directly or indirectly
            ]
          },
          exclude: [isTest ? /\.(e2e)\.ts$/ : /\.(spec|e2e)\.ts$/, /node_modules\/(?!(ng2-.+))/]
        },
  
        // copy those assets to output
        {test: /\.(png|jpe?g|gif|svg|woff|woff2|ttf|eot|ico)$/, loader: 'file?name=fonts/[name].[hash].[ext]?'},
  
        // Support for *.json files.
        {test: /\.json$/, loader: 'json'},
  
        // Support for CSS as raw text
        // use 'null' loader in test mode (https://github.com/webpack/null-loader)
        // all css in src/style will be bundled in an external css file
        {
          test: /\.css$/,
          exclude: root('src', 'client'),
          loader: isTest ? 'null' : ExtractTextPlugin.extract('style', 'css?sourceMap!postcss')
        },
        // all css required in src/client files will be merged in js files
        {test: /\.css$/, include: root('src', 'client'), loader: 'raw!postcss'},
  
        // support for .scss files
        // use 'null' loader in test mode (https://github.com/webpack/null-loader)
        // all css in src/style will be bundled in an external css file
        {
          test: /\.scss$/,
          exclude: root('src', 'client'),
          loader: isTest ? 'null' : ExtractTextPlugin.extract('style', 'css?sourceMap!postcss!sass')
        },
        // all css required in src/client files will be merged in js files
        {test: /\.scss$/, exclude: root('src', 'style'), loader: 'raw!postcss!sass'},
  
        // support for .html as raw text
        // todo: change the loader to something that adds a hash to images
        {test: /\.html$/, loader: 'raw'}
      ],
      postLoaders: [],
      noParse: [/.+zone\.js\/dist\/.+/, /.+angular2\/bundles\/.+/, /angular2-polyfills\.js/]
    };
  
    if (isTest) {
      // instrument only testing sources with Istanbul, covers js compiled files for now :-/
      config.module.postLoaders.push({
        test: /\.(js|ts)$/,
        include: path.resolve('src'),
        loader: 'istanbul-instrumenter-loader',
        exclude: [/\.spec\.ts$/, /\.e2e\.ts$/, /node_modules/]
      })
    }
  
    /**
     * Plugins
     * Reference: http://webpack.github.io/docs/configuration.html#plugins
     * List: http://webpack.github.io/docs/list-of-plugins.html
     */
    config.plugins = [
      // Define env variables to help with builds
      // Reference: https://webpack.github.io/docs/list-of-plugins.html#defineplugin
      new webpack.DefinePlugin({
        // Environment helpers
        'process.env': {
          ENV: JSON.stringify(ENV)
        }
      })
    ];
  
    if (!isTest) {
      config.plugins.push(
        // Generate common chunks if necessary
        // Reference: https://webpack.github.io/docs/code-splitting.html
        // Reference: https://webpack.github.io/docs/list-of-plugins.html#commonschunkplugin
        new CommonsChunkPlugin({
          name: ['vendor', 'polyfills']
        }),
  
        // Inject script and link tags into html files
        // Reference: https://github.com/ampedandwired/html-webpack-plugin
        new HtmlWebpackPlugin({
          template: './src/public/index.html',
          inject: 'body',
          chunksSortMode: packageSort(['polyfills', 'vendor', 'app'])
        }),
  
        // Extract css files
        // Reference: https://github.com/webpack/extract-text-webpack-plugin
        // Disabled when in test mode or not in build mode
        new ExtractTextPlugin('css/[name].[hash].css', {disable: !isProd})
      );
    }
  
    // Add build specific plugins
    if (isProd) {
      config.plugins.push(
        // Reference: http://webpack.github.io/docs/list-of-plugins.html#noerrorsplugin
        // Only emit files when there are no errors
        new webpack.NoErrorsPlugin(),
  
        // Reference: http://webpack.github.io/docs/list-of-plugins.html#dedupeplugin
        // Dedupe modules in the output
        new webpack.optimize.DedupePlugin(),
  
        // Reference: http://webpack.github.io/docs/list-of-plugins.html#uglifyjsplugin
        // Minify all javascript, switch loaders to minimizing mode
        new webpack.optimize.UglifyJsPlugin({
          // Angular 2 is broken again, disabling mangle until beta 6 that should fix the thing
          // Todo: remove this with beta 6
          mangle: false
        }),
  
        // Copy assets from the public folder
        // Reference: https://github.com/kevlened/copy-webpack-plugin
        new CopyWebpackPlugin([{
          from: root('src/public')
        }])
      );
    }
  
    /**
     * PostCSS
     * Reference: https://github.com/postcss/autoprefixer-core
     * Add vendor prefixes to your css
     */
    config.postcss = [
      autoprefixer({
        browsers: ['last 2 version']
      })
    ];
  
    /**
     * Sass
     * Reference: https://github.com/jtangelder/sass-loader
     * Transforms .scss files to .css
     */
    config.sassLoader = {
      //includePaths: [path.resolve(__dirname, "node_modules/foundation-sites/scss")]
    };
  
    /**
     * Apply the tslint loader as pre/postLoader
     * Reference: https://github.com/wbuchwalter/tslint-loader
     */
    config.tslint = {
      emitErrors: false,
      failOnHint: false
    };
  
    /**
     * Dev server configuration
     * Reference: http://webpack.github.io/docs/configuration.html#devserver
     * Reference: http://webpack.github.io/docs/webpack-dev-server.html
     */
    config.devServer = {
      contentBase: './src/public',
      historyApiFallback: true,
      stats: 'minimal' // none (or false), errors-only, minimal, normal (or true) and verbose
    };
  
    return config;
  }();
  
  // Helper functions
  function root(args) {
    args = Array.prototype.slice.call(arguments, 0);
    return path.join.apply(path, [__dirname].concat(args));
  }
  
  function rootNode(args) {
    args = Array.prototype.slice.call(arguments, 0);
    return root.apply(path, ['node_modules'].concat(args));
  }
  
  function packageSort(packages) {
    // packages = ['polyfills', 'vendor', 'app']
    var len = packages.length - 1;
    var first = packages[0];
    var last = packages[len];
    return function sort(a, b) {
      // polyfills always first
      if (a.names[0] === first) {
        return -1;
      }
      // main always last
      if (a.names[0] === last) {
        return 1;
      }
      // vendor before app
      if (a.names[0] !== first && b.names[0] === last) {
        return -1;
      } else {
        return 1;
      }
    }
  }
  