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    React v16.9.0 and the Roadmap Update

    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 <React.Profiler> – measures how often app renders and what’s the “cost” of render is

    Bugfixes:

    • A crash when calling findDOMNode() inside a <Suspense> 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.)

     

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