webpack.config.js

const fs = require('fs');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')

const bundleNames = fs.readdirSync('./client/scripts');
const entries = {};
for (let name of bundleNames) {
    if(name.split('.').length == 1){
        entries[name] = `./client/scripts/${name}/index.js`
    }
    
}

module.exports = {
    mode: 'development',
    devtool: 'inline-source-map',
    entry: entries,
    output: {
        filename: './javascripts/[name].bundle.js',
        sourceMapFilename: './javascripts/[name].bundle.js.map'
    },
    module: {
        rules: [
            {
                test: /\.jsx?$/,
                exclude: /(node_modules|bower_components)/,
                loader: 'babel-loader',
                query: { presets: ['es2015'] }
            }, {
                test: /\.sass$/,
                use: [{ loader: 'style-loader' }, { loader: 'css-loader?-url' }, { loader: 'sass-loader' }]
            }]
    },
    plugins: [
        new UglifyJsPlugin({ sourceMap: true })
    ]
};