.babelrc

{
  "presets": [
    ["@babel/preset-env", {
      "modules": false,
      "useBuiltIns": "entry",
      "exclude": [
        "transform-regenerator"
      ],
      "targets": {
        "ie": "11"
      }
    }]
  ],

  "env": {
    "test": {
      "presets": ["env"]
    }
  }
}

.gitignore

node_modules
_build
yarn-error.log
yarn.lock

README.md

Raven

ANALYZE=1 yarn webpack --mode=production

main.js

import Raven from "raven-js"

Raven.setup("asda").install()

package.json

{
  "name": "",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "repository": "",
  "author": "",
  "license": "UNLICENSED",
  "private": true,
  "devDependencies": {
    "@babel/core": "^7.0.0-beta",
    "@babel/plugin-proposal-class-properties": "^7.0.0-beta.52",
    "@babel/plugin-proposal-object-rest-spread": "^7.0.0-beta",
    "@babel/preset-env": "^7.0.0-beta",
    "babel-loader": "^8.0.0-beta",
    "webpack": "^4.14.0",
    "webpack-bundle-analyzer": "^2.13.1",
    "webpack-cli": "^3.0.8"
  },
  "dependencies": {
    "raven-js": "^3.17.0"
  }
}

webpack.config.js

var webpack = require('webpack')
var path = require('path')

var NODE_ENV = process.env.NODE_ENV || 'development'

var config = {
  entry: [
    path.resolve(__dirname, 'main.js'),
  ],

 output: {
    filename: 'bundle.js',
    chunkFilename: '[name].js',
    path: path.resolve(__dirname, '_build'),
    publicPath: '/',
  },

  target: 'web',

  module: {
    rules: [
      { test: /\.js?$/, exclude: [/node_modules/], loader: 'babel-loader' },
    ],
  },

  plugins: [],
}


if (process.env.ANALYZE) {
  var AnalyzerPlugin = require('webpack-bundle-analyzer')

  config.plugins.push(new AnalyzerPlugin.BundleAnalyzerPlugin())
}

module.exports = config