webpack.config.js

var webpack = require('webpack');
var path = require('path');
var UglifyJsPlugin = webpack.optimize.UglifyJsPlugin;
var env = require('yargs').argv.env;

var libraryName = 'MeasureTool';

var plugins = [], outputFile;

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

var config = {
  entry: __dirname + '/src/index.js',
  devtool: 'source-map',
  output: {
    path: __dirname + '/lib',
    filename: outputFile,
    library: libraryName,
    libraryTarget: 'umd',
    umdNamedDefine: true
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.scss$/,
        use: [{
          loader: "style-loader"
        }, {
          loader: "css-loader",
          options: {
            sourceMap: true
          }
        }, {
          loader: "sass-loader",
          options: {
            sourceMap: true
          }
        }]
      }
    ]
  },
  resolve: {
    modules: [path.resolve('./src'), "node_modules"],
    extensions: ['.js']
  },
  plugins: plugins
};

module.exports = config;