text: /**
   * @author: @ankeshdave
   */
  
  const helpers = require('./helpers');
  const webpackMerge = require('webpack-merge'); // used to merge webpack configs
  const commonConfig = require('./webpack.common.js'); // the settings that are common to prod and dev
  
  /**
   * Webpack Plugins
   */
  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
  });
  
  /**
   * 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: '[name].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',
      },
  
      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,
          }
        }),
  
        /**
         * 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: {
        port: METADATA.port,
        host: METADATA.host,
        historyApiFallback: true,
        watchOptions: {
          aggregateTimeout: 300,
          poll: 1000
        }
      },
  
      /*
       * 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
      }
  
    });
  }
  