title: Browser Console error: Cannot find module 'react-dom/lib/ReactPerf' from 'react/lib/ReactAddonsDOMDependencies.js'
body: <p>This started today after saving the <code>react-addons-css-transition-group</code> npm package as a dependency.</p>
  
  <p>I then went down a rabbit hole of updating, adding &amp; removing various dependencies as well as making sure all the react-related dependencies share the same versioning. I think I'm back to where I was before adding the <code>react-addons-css-transition-group</code> dependency, aside from updates, but I'm still getting this error and I can't find anything online relating to it specifically.</p>
  
  <p>package.json if that helps:</p>
  
  <pre><code>{
    "name": "",
    "version": "0.1.0",
    "author": "",
    "description": "",
    "license": "MIT",
    "repository": {
      "type": "git",
      "url": ""
    },
    "main": "server.js",
    "scripts": {
      "lint": "eslint --ext .js,.jsx --ignore-pattern public",
      "start": "brunch watch --server",
      "knex": "knex",
      "heroku-postbuild": "brunch build --production; knex migrate:latest",
      "nf": "nf start"
    },
    "dependencies": {
      "auto-reload-brunch": "^2.7.1",
      "axios": "^0.14.0",
      "babel-brunch": "^6.0.5",
      "babel-preset-es2015": "^6.9.0",
      "babel-preset-react": "^6.11.1",
      "bcrypt": "^0.8.7",
      "bcrypt-as-promised": "^1.1.0",
      "body-parser": "^1.15.2",
      "boom": "^4.0.0",
      "brunch": "^2.9.1",
      "clean-css-brunch": "^2.0.0",
      "cookie-parser": "^1.4.3",
      "dotenv": "^2.0.0",
      "express": "^4.14.0",
      "express-validation": "^1.0.1",
      "humps": "^1.1.0",
      "javascript-brunch": "^2.0.0",
      "joi": "^9.0.4",
      "jsonwebtoken": "^7.1.9",
      "knex": "^0.12.0",
      "material-ui": "^0.16.3",
      "morgan": "^1.7.0",
      "multer": "1.1.0",
      "pg": "^6.1.0",
      "react": "^15.4.1",
      "react-cookie": "^0.4.8",
      "react-dom": "^15.4.1",
      "react-router": "^2.8.0",
      "react-tap-event-plugin": "^2.0.0",
      "sass-brunch": "^2.7.0",
      "weak-key": "^1.0.0",
      "xml2js": "^0.4.17"
    },
    "devDependencies": {
      "eslint": "^3.2.2",
      "eslint-config-ryansobol": "^8.0.0",
      "foreman": "^2.0.0"
    },
    "engines": {
      "node": "7.2.0"
    }
  }
  </code></pre>