Webpack simple confing (Scss + Html watcher)

package.json

{
  "name": "testmock",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack-dev-server"
  },
  "author": "",
  "license": "MIT",
  "devDependencies": {
    "css-loader": "^1.0.0",
    "extract-text-webpack-plugin": "^3.0.2",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^3.2.0",
    "node-sass": "^4.9.4",
    "raw-loader": "^0.5.1",
    "sass-loader": "^7.1.0",
    "style-loader": "^0.23.1",
    "webpack": "^4.20.2",
    "webpack-cli": "^3.1.2",
    "webpack-dev-server": "^3.1.9"
  }
}

webpack.config.js

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

module.exports = {
	entry: './src/js/app.js',
	output: {
			path: path.resolve(__dirname, 'dist'),
			filename: 'bundle.js',
			publicPath: '/dist'
	},
	mode: 'development',
	module: {
		rules: [
			{
				test: /\.html$/,
				use: 'html-loader'
			},
			{
				test: /\.scss$/,
        use: [
          {
            loader: "style-loader" // creates style nodes from JS strings
          },
          {
            loader: "css-loader" // translates CSS into CommonJS
          },
          {
            loader: "sass-loader" // compiles Sass to CSS
          }
        ]
			},
			
		]
	},
	plugins: [

    new HtmlWebpackPlugin({
      template: './index.html'
    })
  ],
};