webpack.config.js

const webpack = require('webpack');
const ExtractTextPlugin = require("extract-text-webpack-plugin");
var webpackUglifyJsPlugin = require('webpack-uglify-js-plugin');

var path = require('path');

module.exports = {
    entry: './app/Resources/js/index.js',
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'public/js')
    },
    module: {
        rules: [{
            test: /\.css$/,
            use: ExtractTextPlugin.extract({
                use: 'css-loader'
            })
        }]
    },
    plugins:[
        new ExtractTextPlugin('styles.css'),
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': JSON.stringify('production')
        }),
        new webpack.ProvidePlugin({
            jQuery: 'jquery',
            $: 'jquery',
            jquery: 'jquery',
            Tether: 'tether'
        })
    ]
};