webpack.config.js

const path = require('path');
const webpack = require('webpack');

const UglifyJsPlugin = webpack.optimize.UglifyJsPlugin;
const env = process.env.WEBPACK_ENV;

const libraryName = 'Wall';
let plugins = [],
  outputFile;

if (env === 'build') {
  plugins.push(new UglifyJsPlugin({ minimize: true }));
  outputFile = 'wall.min.js';
} else {
  outputFile = 'wall.js';
};

module.exports = {
  entry: './src/wall.js',
  output: {
    filename: outputFile,
    path: path.resolve(__dirname, 'dist'),
    library: libraryName,
    libraryTarget: 'umd2'
  },
  module: {
    rules: [{
      test: /.jsx?$/,
      include: [
        path.resolve(__dirname, 'src')
      ],
      exclude: [
        path.resolve(__dirname, 'node_modules')
      ],
      loader: 'babel-loader',
      options: {
        presets: ['es2015', 'stage-2']
      }
    }]
  },
  resolve: {
    extensions: ['.js', '.jsx']
  },
  devtool: 'source-map',
  plugins: plugins
};