WEBPACK 4 CONFIG - ES6

package.json

{
  "name": "webpacka-init",
  "version": "1.0.0",
  "description": "<img alt=\"Logo\" src=\"http://coderslab.pl/svg/logo-coderslab.svg\" width=\"400\">",
  "main": "index.js",
  "scripts": {
    "watch": "node_modules/.bin/webpack -w",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.5",
    "babel-preset-es2015": "^6.24.1",
    "browser-sync": "^2.24.7",
    "browser-sync-webpack-plugin": "^2.2.2",
    "clean-webpack-plugin": "^0.1.19",
    "css-loader": "^1.0.0",
    "file-loader": "^2.0.0",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^3.2.0",
    "mini-css-extract-plugin": "^0.4.3",
    "node-sass": "^4.9.3",
    "sass-loader": "^7.1.0",
    "style-loader": "^0.23.0",
    "webpack": "^4.20.2",
    "webpack-cli": "^3.1.1",
    "webpack-livereload-plugin": "^2.1.1",
    "webpack-node-externals": "^1.7.2"
  }
}

webpack.config.js

const path = require('path');
const BrowserSyncPlugin = require('browser-sync-webpack-plugin');

module.exports = {
    entry: './js/app.js',
    output: {
        path: path.resolve(__dirname, 'js'),
        filename: "out.js",
        publicPath: './js/'
    },
    mode: "development",
    devtool: "source-map",
    watch: true,
    plugins: [
        new BrowserSyncPlugin({
            host: 'localhost',
            port: 3000,
            reload: true,
            server: {
                baseDir: ['./']
            }
        })
    ],
    module: {
        rules: [
            {
                test: /\.js?$/,
                exclude: [
                    path.resolve(__dirname, 'node_modules')
                ],
                loader: 'babel-loader',
                options: {
                    presets: ['es2015'],
                    sourceMap: true,
                }
            },
            {
                test: /\.scss?$/,
                exclude: [
                    path.resolve(__dirname, 'node_modules')
                ],
                loader: 'style-loader!css-loader!sass-loader',

            },
            {
                test: /\.html?$/,
                exclude: [
                    path.resolve(__dirname, 'node_modules')
                ],
                use: {
                    loader: 'html-loader',
                    options: {
                        attrs: [':data-src']
                    }
                },
            },
            {
                test: /\.(png|jpg|gif)$/,
                exclude: [
                    path.resolve(__dirname, 'node_modules')
                ],
                use: [
                    {
                        loader: 'file-loader',
                        options: {}
                    }
                ]
            }
        ]
    }
}