A minimal webpack setup for bundling JS for browsers via Babel.

webpack.config.js

'use strict';

const path = require('path');

module.exports = {
    /** @see https://webpack.js.org/configuration/entry-context/#entry */
    entry: './src/js/index.js',

    /** @see https://webpack.js.org/configuration/output/ */
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist')
    },

    /** @see https://webpack.js.org/configuration/devtool/ */
    devtool: 'source-map',

    /** @see https://webpack.js.org/configuration/resolve/ */
    resolve: {
        extensions: ['.js']
    },

    /** @see https://webpack.js.org/configuration/module/ */
    module: {
        rules: [
            {
                test: /\.js$/,
                loader: 'babel-loader',
                options: {
                    presets: ['env']
                },
                exclude: /node_modules/
            }
        ]
    }
}

Prerequisite install: yarn add --dev babel-core babel-preset-env babel-loader webpack.