Function Page

packages/react-reconciler/src/__tests__/useEffectEvent-test.js:807–830

({url})

    }

    function Page({url}) {
      const {items, updateItems} = useContext(ShoppingCartContext);
      const onClick = useEffectEvent(() => updateItems([...items, 1]));
      const numberOfItems = items.length;

      const onVisit = useEffectEvent(visitedUrl => {
        Scheduler.log(
          'url: ' + visitedUrl + ', numberOfItems: ' + numberOfItems,
        );
      });

      useEffect(() => {
        onVisit(url);
      }, [url]);

      return (
        <AddToCartButton
          onClick={() => {
            onClick();
          }}
          ref={button}
        />
      );
    }

    const button = React.createRef(null);
    await act(() =>