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3b6826ed9e
This mode is going to be the new default in Flow going forward.
There was an unfortuante large number of suppressions in this update.
More on the changes can be found in this [Flow blog post](https://medium.com/flow-type/new-flow-language-rule-constrained-writes-4c70e375d190).
Added some of the required annotations using the provided codemod:
```sh
node_modules/.bin/flow codemod annotate-declarations --write .
```
ghstack-source-id: 0b168e1b23
Pull Request resolved: https://github.com/facebook/react/pull/25422
react-test-renderer
This package provides an experimental React renderer that can be used to render React components to pure JavaScript objects, without depending on the DOM or a native mobile environment.
Essentially, this package makes it easy to grab a snapshot of the "DOM tree" rendered by a React DOM or React Native component without using a browser or jsdom.
Documentation:
https://reactjs.org/docs/test-renderer.html
Usage:
const ReactTestRenderer = require('react-test-renderer');
const renderer = ReactTestRenderer.create(
<Link page="https://www.facebook.com/">Facebook</Link>
);
console.log(renderer.toJSON());
// { type: 'a',
// props: { href: 'https://www.facebook.com/' },
// children: [ 'Facebook' ] }
You can also use Jest's snapshot testing feature to automatically save a copy of the JSON tree to a file and check in your tests that it hasn't changed: https://jestjs.io/blog/2016/07/27/jest-14.html.