webpack.config.js

const path = require('path');
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const NODE_ENV = process.env.NODE_ENV || 'development';
const webpack = require('webpack');

module.exports = {
    entry: './public/js/controller.js',
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist')
    },

    watch: NODE_ENV === 'development',
    watchOptions: {
        aggregateTimeout: 100
    },

    devtool: NODE_ENV === 'development' ? 'source-map' : null,

    plugins: [
        new webpack.NoEmitOnErrorsPlugin(),
        new webpack.DefinePlugin({
            NODE_ENV: JSON.stringify(NODE_ENV)
        }),
        new webpack.ProvidePlugin({
            $: 'jquery',
            jQuery: 'jquery'
        }),
        new ExtractTextPlugin('[name].css')
    ],

    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            }
        ],

        loaders: [
            {
                test: /\.css$/,
                loader: ExtractTextPlugin.extract('style-loader', 'css-loader')
            }
        ]
    }

};