webpack.config.js

let HtmlWebpackPlugin = require('html-webpack-plugin');
let ExtractTextPlugin = require('extract-text-webpack-plugin');
const path = require('path');

module.exports = {
    entry: ['babel-polyfill', './src/js/main.js'],
    output: {
        path: path.resolve(__dirname, 'build'),
        filename: 'app.js'
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['env']
                    }
                }
            },
            {
                test: /\.scss$/,
                use: ExtractTextPlugin.extract({
                    fallback: 'style-loader',
                    use: ['css-loader','sass-loader'],
                    publicPath: '/dist'
                })
            },
        ]
    },
    devtool: 'source-map',
    devServer: {
        contentBase: path.join(__dirname, 'build'),
        compress: true,
        stats: "errors-only",
        open: true
    },
    plugins: [
        new HtmlWebpackPlugin({
            filename: 'index.html',
            template: 'src/index.html'
        }),
        new ExtractTextPlugin({
            filename: 'style.css',
            disable: false,
            allChunks: true
        })
    ]
};