Function Counter

packages/react-reconciler/src/__tests__/ReactHooks-test.internal.js:229–235

()

    let setCounter;
    function Counter() {
      const [counter, _setCounter] = useState(0);
      setCounter = _setCounter;

      Scheduler.log(`Count: ${counter}`);
      return counter;
    }

    const root = ReactTestRenderer.create(null, {unstable_isConcurrent: true});
    root.update(<Counter />);