webpack.config.js

const ExtractTextPlugin = require("extract-text-webpack-plugin");
const Webpack = require("webpack");

const isProd = JSON.parse(process.env.PROD_ENV || '0');

console.log(isProd);

module.exports = {
  context: __dirname,
  devtool: 'source-map',
  entry: {
    itslog: './src/index.js',
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel',
        query: {
          presets: ['es2015'],
        },
      },
    ],
  },
  output: {
    path: __dirname,
    filename: isProd ? '[name].min.js' : '[name].js',
    sourceMapFilename: '[name].sourcemap.js',
    library: 'itslog',
    libraryTarget: 'umd',
  },
  plugins: isProd ? [
    new Webpack.optimize.UglifyJsPlugin({ minimize: false }),
  ] : [],
};