Function Parent

packages/react-reconciler/src/__tests__/ReactHooks-test.internal.js:77–89

()

    let setCounter1;
    let setCounter2;
    function Parent() {
      const [counter1, _setCounter1] = useState(0);
      setCounter1 = _setCounter1;
      const [counter2, _setCounter2] = useState(0);
      setCounter2 = _setCounter2;

      const text = `${counter1}, ${counter2}`;
      Scheduler.log(`Parent: ${text}`);
      useLayoutEffect(() => {
        Scheduler.log(`Effect: ${text}`);
      });
      return <Child text={text} />;
    }

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