Jest setup file to stop React 15.5 createClass / PropTypes deprecation warnings

silence-React-15-deprecations.js

import React from 'react';

/**
 * Since React v15.5, there's a warning printed if you access `React.createClass` or `React.PropTypes`
 * https://reactjs.org/blog/2017/04/07/react-v15.5.0.html#new-deprecation-warnings
 *
 * `import * as React from 'react'` is required by Flowtype https://flow.org/en/docs/react/types/ ,
 * but the * causes both those deprecated getters to be called.
 * This is particularly annoying in Jest since every test prints two useless warnings.
 *
 * This file can be used as a Jest setup file to simply delete those features of the `react` package.
 * You don't need the deprecation warning. Your tests will simply fail if you're still using the old ways.
 * https://facebook.github.io/jest/docs/en/configuration.html#setupfiles-array
 */

delete React.createClass;
delete React.PropTypes;

I know gist notifications are pretty much non-existent, but thank you @turadg! Handy for TypeScript migrations too.

I ended up back here and saw your comment @seanf. Not that you'll get this notification, but if you end up here again: thanks for your comment. :)