How to upgrade "ChangeNotifierProxyProvider" to new version in Flutter?

Question

I got this code:

  providers: [
    ChangeNotifierProvider.value(
      value: Auth(),
    ),
    ChangeNotifierProxyProvider<Auth, Products>(
      builder: (ctx, auth, previousProducts) => Products(
        auth.token,
        auth.userId,
        previousProducts == null ? [] : previousProducts.items,
      ),
    ),
    ChangeNotifierProvider.value(
      value: Cart(),
    ),
    ChangeNotifierProxyProvider<Auth, Orders>(
      builder: (ctx, auth, previousOrders) => Orders(
        auth.token,
        auth.userId,
        previousOrders == null ? [] : previousOrders.orders,
      ),
    ),
  ],

But it seems it's deprecated and gets the following errors at the lines with hangeNotifierProxyProvider:

The parameter 'create' is required.
The parameter 'update' is required.

I don't know how to upgrade this part of code?

Answer 1

I tried the following code and seems it works, but I'm not still sure if I did it right?

  providers: [
    ChangeNotifierProvider.value(
      value: Auth(),
    ),
    ChangeNotifierProxyProvider<Auth, Products>(
      create: (ctx) => Products('', '', []),
      update: (ctx, auth, previousProducts) => Products(
        auth.token,
        auth.userId,
        previousProducts == null ? [] : previousProducts.items,
      ),
    ),
    ChangeNotifierProvider.value(
      value: Cart(),
    ),
    ChangeNotifierProxyProvider<Auth, Orders>(
      create: (ctx) => Orders('', '', []),
      update: (ctx, auth, previousOrders) => Orders(
        auth.token,
        auth.userId,
        previousOrders == null ? [] : previousOrders.orders,
      ),
    ),
  ],