text: /**
   * @author: @AngularClass
   */
  
  const helpers = require('./helpers');
  const webpackMerge = require('webpack-merge'); // used to merge webpack configs
  const webpackMergeDll = webpackMerge.strategy({plugins: 'replace'});
  const commonConfig = require('./webpack.common.js'); // the settings that are common to prod and dev
  
  /**
   * Webpack Plugins
   */
  const AddAssetHtmlPlugin = require('add-asset-html-webpack-plugin');
  const DefinePlugin = require('webpack/lib/DefinePlugin');
  const NamedModulesPlugin = require('webpack/lib/NamedModulesPlugin');
  const LoaderOptionsPlugin = require('webpack/lib/LoaderOptionsPlugin');
  
  /**
   * Webpack Constants
   */
  const ENV = process.env.ENV = process.env.NODE_ENV = 'development';
  const HOST = process.env.HOST || 'localhost';
  const PORT = process.env.PORT || 3000;
  const HMR = helpers.hasProcessFlag('hot');
  const METADATA = webpackMerge(commonConfig({env: ENV}).metadata, {
    host: HOST,
    port: PORT,
    ENV: ENV,
    HMR: HMR
  });
  
  
  const DllBundlesPlugin = require('webpack-dll-bundles-plugin').DllBundlesPlugin;
  
  /**
   * Webpack configuration
   *
   * See: http://webpack.github.io/docs/configuration.html#cli
   */
  module.exports = function (options) {
    return webpackMerge(commonConfig({env: ENV}), {
  
      /**
       * Developer tool to enhance debugging
       *
       * See: http://webpack.github.io/docs/configuration.html#devtool
       * See: https://github.com/webpack/docs/wiki/build-performance#sourcemaps
       */
      devtool: 'cheap-module-source-map',
  
      /**
       * Options affecting the output of the compilation.
       *
       * See: http://webpack.github.io/docs/configuration.html#output
       */
      output: {
  
        /**
         * The output directory as absolute path (required).
         *
         * See: http://webpack.github.io/docs/configuration.html#output-path
         */
        path: helpers.root('dist'),
  
        /**
         * Specifies the name of each output file on disk.
         * IMPORTANT: You must not specify an absolute path here!
         *
         * See: http://webpack.github.io/docs/configuration.html#output-filename
         */
        filename: '[name].bundle.js',
  
        /**
         * The filename of the SourceMaps for the JavaScript files.
         * They are inside the output.path directory.
         *
         * See: http://webpack.github.io/docs/configuration.html#output-sourcemapfilename
         */
        sourceMapFilename: '[file].map',
  
        /** The filename of non-entry chunks as relative path
         * inside the output.path directory.
         *
         * See: http://webpack.github.io/docs/configuration.html#output-chunkfilename
         */
        chunkFilename: '[id].chunk.js',
  
        library: 'ac_[name]',
        libraryTarget: 'var',
      },
  
      module: {
  
        rules: [
         {
           test: /\.ts$/,
           use: [
             {
               loader: 'tslint-loader',
               options: {
                 configFile: 'tslint.json'
               }
             }
           ],
           exclude: [/\.(spec|e2e)\.ts$/]
         },
  
          /*
           * css loader support for *.css files (styles directory only)
           * Loads external css styles into the DOM, supports HMR
           *
           */
          {
            test: /\.css$/,
            use: ['style-loader', 'css-loader'],
            include: [helpers.root('src', 'styles')]
          },
  
          /*
           * sass loader support for *.scss files (styles directory only)
           * Loads external sass styles into the DOM, supports HMR
           *
           */
          {
            test: /\.scss$/,
            use: ['style-loader', 'css-loader', 'sass-loader'],
            include: [helpers.root('src', 'styles')]
          },
  
        ]
  
      },
  
      plugins: [
  
        /**
         * Plugin: DefinePlugin
         * Description: Define free variables.
         * Useful for having development builds with debug logging or adding global constants.
         *
         * Environment helpers
         *
         * See: https://webpack.github.io/docs/list-of-plugins.html#defineplugin
         */
        // NOTE: when adding more properties, make sure you include them in custom-typings.d.ts
        new DefinePlugin({
          'ENV': JSON.stringify(METADATA.ENV),
          'HMR': METADATA.HMR,
          'process.env': {
            'ENV': JSON.stringify(METADATA.ENV),
            'NODE_ENV': JSON.stringify(METADATA.ENV),
            'HMR': METADATA.HMR,
          }
        }),
  
        new DllBundlesPlugin({
          bundles: {
            polyfills: [
              'core-js',
              {
                name: 'zone.js',
                path: 'zone.js/dist/zone.js'
              },
              {
                name: 'zone.js',
                path: 'zone.js/dist/long-stack-trace-zone.js'
              },
            ],
            vendor: [
              '@angular/platform-browser',
              '@angular/platform-browser-dynamic',
              '@angular/core',
              '@angular/common',
              '@angular/forms',
              '@angular/http',
              '@angular/router',
              '@angularclass/hmr',
              'rxjs',
            ]
          },
          dllDir: helpers.root('dll'),
          webpackConfig: webpackMergeDll(commonConfig({env: ENV}), {
            devtool: 'cheap-module-source-map',
            plugins: []
          })
        }),
  
        /**
         * Plugin: AddAssetHtmlPlugin
         * Description: Adds the given JS or CSS file to the files
         * Webpack knows about, and put it into the list of assets
         * html-webpack-plugin injects into the generated html.
         *
         * See: https://github.com/SimenB/add-asset-html-webpack-plugin
         */
        new AddAssetHtmlPlugin([
          { filepath: helpers.root(`dll/${DllBundlesPlugin.resolveFile('polyfills')}`) },
          { filepath: helpers.root(`dll/${DllBundlesPlugin.resolveFile('vendor')}`) }
        ]),
  
        /**
         * Plugin: NamedModulesPlugin (experimental)
         * Description: Uses file names as module name.
         *
         * See: https://github.com/webpack/webpack/commit/a04ffb928365b19feb75087c63f13cadfc08e1eb
         */
        // new NamedModulesPlugin(),
  
        /**
         * Plugin LoaderOptionsPlugin (experimental)
         *
         * See: https://gist.github.com/sokra/27b24881210b56bbaff7
         */
        new LoaderOptionsPlugin({
          debug: true,
          options: {
  
          }
        }),
  
      ],
  
      /**
       * Webpack Development Server configuration
       * Description: The webpack-dev-server is a little node.js Express server.
       * The server emits information about the compilation state to the client,
       * which reacts to those events.
       *
       * See: https://webpack.github.io/docs/webpack-dev-server.html
       */
      devServer: {
        quiet: false,
        stats: { colors: true },
        port: METADATA.port,
        host: METADATA.host,
        historyApiFallback: true,
        watchOptions: {
          aggregateTimeout: 300,
          poll: 1000
        },
        proxy: {
          "/api": {
            "target": {
              "host": "localhost",
              "protocol": 'http:',
              "port": 4300
            },
            ignorePath: false,
            changeOrigin: true,
            secure: false
          }
        }
      },
  
      /*
       * Include polyfills or mocks for various node stuff
       * Description: Node configuration
       *
       * See: https://webpack.github.io/docs/configuration.html#node
       */
      node: {
        global: true,
        crypto: 'empty',
        process: true,
        module: false,
        clearImmediate: false,
        setImmediate: false
      }
  
    });
  }
  