Function AppShell

packages/react-reconciler/src/__tests__/useEffectEvent-test.js:796–805

({children})

    const ShoppingCartContext = createContext(null);

    function AppShell({children}) {
      const [items, updateItems] = useState([]);
      const value = useMemo(() => ({items, updateItems}), [items, updateItems]);

      return (
        <ShoppingCartContext.Provider value={value}>
          {children}
        </ShoppingCartContext.Provider>
      );
    }

    function Page({url}) {
      const {items, updateItems} = useContext(ShoppingCartContext);