New Deprecations:
- you will now see a warning when using any of the old names of unsafe lifecycle method
- Using "javascript:" URLs now will log a warning
- No support for “factory” component that returns an object with a render method
New Features:
- act() testing utility also accepts asynchronous functions
- programmatic way to gather measurements called - measures how often app renders and what's the "cost" of render is
Bugfixes:
- A crash when calling findDOMNode() inside a tree has been fixed.
- A memory leak caused by retaining deleted subtrees has been fixed too.
- An infinite loop caused by setState in useEffect now logs an error. (This is similar to the error you see when you call setState in componentDidUpdate in a class.)
Source: https://reactjs.org/blog/2019/08/08/react-v16.9.0.html
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