webpack.config.js

/* global __dirname, require, module */

const webpack = require('webpack');

const { UglifyJsPlugin } = webpack.optimize;
const path = require('path');
const { env } = require('yargs').argv; // use --env with webpack 2
const pkg = require('./package.json');

const libraryName = pkg.name;

const plugins = [];
let outputFile;

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

const config = {
  entry: ['babel-polyfill', `${__dirname}/src/index.js`],
  devtool: 'source-map',
  output: {
    path: `${__dirname}/dist`,
    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('./node_modules'), path.resolve('./src')],
    extensions: ['.json', '.js'],
  },
  plugins,
};

module.exports = config;