webpack angular hmr

package.json

{
  "name": "webpack-hmr",
  "version": "0.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "build": "webpack --bail --progress --profile -p",
    "dev": "webpack-dev-server --port 9100 --progress --colors --hot --inline"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "angular": "1.3.20",
    "angular-animate": "1.3.20",
    "angular-cookies": "1.3.20",
    "angular-resource": "1.3.20",
    "angular-route": "1.3.20",
    "babel-core": "^6.23.1",
    "babel-loader": "^6.3.2",
    "babel-preset-es2015": "^6.22.0",
    "clean-webpack-plugin": "^0.1.15",
    "css-loader": "^0.26.2",
    "html-webpack-plugin": "^2.28.0",
    "node-sass": "^4.5.0",
    "sass-loader": "^6.0.2",
    "style-loader": "^0.13.2",
    "webpack": "^2.2.1",
    "webpack-dev-server": "^2.4.1"
  }
}

webpack.config.js

var path = require('path');
var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var CleanWebpackPlugin = require('clean-webpack-plugin');

var ENV = process.env.npm_lifecycle_event;
var isProd = (ENV==='build');


module.exports = makeWebpackConfig();

function makeWebpackConfig() {
    var config = {};

    if (isProd) {
	config.devtool = 'source-map';
    } else {
	config.devtool = 'eval-source-map';
    }

    config.entry = path.join(__dirname, 'src/index.js');

    config.output = {
	filename: isProd ? '[name].[hash].js' : '[name].bundle.js',
	path: path.join(__dirname, 'dist'),
	chunkFilename: isProd ? '[name].[hash].js' : '[name].bundle.js'
    };

    config.module = {
	rules: [
	    {
		test: /\.js$/,
		loader: 'babel-loader',
	    	exclude: /node_modules/,
		options: {
		    presets: ['es2015']
		}
		
	    },
	    {
		test: /\.scss/,
		use: [
		    {
			loader: 'style-loader'
		    },
		    {
			loader: 'css-loader'
		    },
		    {
			loader: 'sass-loader'
		    }
		]
	    }
	]
    };
    
    config.plugins = [
	new CleanWebpackPlugin(
	    [path.join(__dirname, 'dist')],
	    {
		verbose: true,
		dry: false
	    }
	),
	new HtmlWebpackPlugin({
	    filename: 'index.html',
	    template: path.join(__dirname, 'src/index.html')
	}),

	new webpack.NamedModulesPlugin()
    ];

    return config;
}