TypeError: React.PropTypes is undefined. Migrating 2.3 -> 2.4

[thorstenhirsch]

After upgrading from 2.3.1 to 2.4.0 my react components don't work anymore. In the console I get the following error:
TypeError: React.PropTypes is undefined
I've already seen that React.PropTypes has been deprecated and is now in its own module (prop-types), but downloading prop-types.min.js and including it before including react_ujs did not solve the problem. I guess the following statement needs to be added now:
var PropTypes = require('prop-types');

[BookOfGreg]

I'm afraid so. You could stay on 2.3.1 for now but yes eventually you will have to handle the prop-type issue.

https://reactjs.org/blog/2017/04/07/react-v15.5.0.html#migrating-from-reactproptypes

I have a codebase that's several thousand likes of JS, for me it was every file require 'prop-types' and global find replace React.Prop -> Prop

Are you using Webpack or Sprockets?

For Sprockets:: The pre-bundled sprockets has prop-types already included for convenience: https://github.com/reactjs/react-rails/blob/master/react-builds/react-browser.js#L4

For Webpacker:: You can safely re-run bundle exec rails webpacker:install:react and it will yarn add prop-types for you. https://github.com/rails/webpacker/blob/master/lib/install/react.rb#L26