webpack.config.js

/* global __dirname, require, module*/

// const webpack = require('webpack');
const fs = require('fs');
// const UglifyJsPlugin = webpack.optimize.UglifyJsPlugin;
const path = require('path');
const env = require('yargs').argv.env; // use --env with webpack 2

let libraryName = 'library';

let plugins = [], outputFile;

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

let nodeModules = {};

fs.readdirSync('node_modules')
  .filter(function (x) {
    return ['.bin'].indexOf(x) === -1;
  })
  .forEach(function (mod) {
    nodeModules[mod] = 'commonjs ' + mod;
  });

const config = {
  entry: __dirname + '/src/index.js',
  devtool: 'source-map',
  target: 'node',
  externals: nodeModules,
  output: {
    path: __dirname + '/lib',
    filename: outputFile,
    library: libraryName,
    libraryTarget: 'umd',
    umdNamedDefine: true
  },
  module: {
    rules: [
      {
        test: /(\.jsx|\.js)$/,
        loader: 'babel-loader',
        exclude: /(node_modules|bower_components)/
      },
      {
        test: /(\.jsx|\.js)$/,
        loader: 'eslint-loader',
        exclude: /node_modules/
      }
    ]
  },
  resolve: {
    modules: [path.resolve('./src')],
    extensions: ['.json', '.js']
  },
  plugins: plugins
};

module.exports = config;