favicongrabber.com/webpack.config.js

const { resolve } = require('path');
const webpack = require('webpack');

require('dotenv').config();

const live = !process.env.NODE_ENV || process.env.NODE_ENV === 'development';
const context = resolve('assets/js/');

const plugins = [];

if (!live) {
  plugins.push(
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"',
      },
    }),
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false,
      },
    }),
  );
}

module.exports = {
  context,
  entry: { app: './app.js' },
  output: {
    filename: '[name].js',
    path: resolve('build/assets/js/'),
  },
  module: {
    rules: [{
      test: /\.js$/,
      include: [context],
      use: [{ loader: 'babel-loader' }],
    }],
  },
  devtool: !live ? false : 'source-map',
  plugins,
};