TS Type Issue on Nested Selects

userData?.cart?.cartItems // Property 'cartItems' does not exist on type '{ id: string; userId: string | null; expiresAt: Date | null; createdAt: Date; updatedAt: Date; }'.ts(2339)

userData?.cart?.cartItems // Property 'cartItems' does not exist on type '{ id: string; userId: string | null; expiresAt: Date | null; createdAt: Date; updatedAt: Date; }'.ts(2339)

{
  userData: {
    deliveryAddresses: [ [Object] ],
    billingAddresses: [ [Object] ],
    cart: { id: '5e74b112-a088-44b1-ab7e-e10405fe37ac', cartItems: [Array] }
  }
}

{
  userData: {
    deliveryAddresses: [ [Object] ],
    billingAddresses: [ [Object] ],
    cart: { id: '5e74b112-a088-44b1-ab7e-e10405fe37ac', cartItems: [Array] }
  }
}

model Cart {
    id        String    @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid
    userId    String?   @unique @map("user_id") @db.Uuid
    expiresAt DateTime? @map("expires_at")
    createdAt DateTime  @default(now()) @map("created_at")
    updatedAt DateTime  @updatedAt @map("updated_at")

    user User? @relation(fields: [userId], references: [id], onDelete: Cascade)

    cartItems CartItem[]

    @@index([userId], name: "user_id_idx")
    @@map("carts")
}

model CartItem {
    cartId    String @map("cart_id") @db.Uuid
  
    // ...

    cart    Cart    @relation(fields: [cartId], references: [id], onDelete: Cascade)

    // ...
}

model Cart {
    id        String    @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid
    userId    String?   @unique @map("user_id") @db.Uuid
    expiresAt DateTime? @map("expires_at")
    createdAt DateTime  @default(now()) @map("created_at")
    updatedAt DateTime  @updatedAt @map("updated_at")

    user User? @relation(fields: [userId], references: [id], onDelete: Cascade)

    cartItems CartItem[]

    @@index([userId], name: "user_id_idx")
    @@map("carts")
}

model CartItem {
    cartId    String @map("cart_id") @db.Uuid
  
    // ...

    cart    Cart    @relation(fields: [cartId], references: [id], onDelete: Cascade)

    // ...
}

const select: Prisma.UserSelect = {
    ...(deliveryAddressId && {
        deliveryAddresses: {
            where: {
                id: deliveryAddressId,
            },
        },
    }),

    billingAddresses: {
        where: {
            id: billingAddressId,
        },
    },

    cart: {
        select: {
            id: true,

            cartItems: {
                select: {
                    quantity: true,
                    product: {
                        select: {
                            id: true,
                            websitePrice: true,
                        },
                    },
                },
            },
        },
    },
};

const userData = await prisma.user.findUnique({
    relationLoadStrategy: 'join',

    where: {
        id: user.id,
    },

    select,
});

const select: Prisma.UserSelect = {
    ...(deliveryAddressId && {
        deliveryAddresses: {
            where: {
                id: deliveryAddressId,
            },
        },
    }),

    billingAddresses: {
        where: {
            id: billingAddressId,
        },
    },

    cart: {
        select: {
            id: true,

            cartItems: {
                select: {
                    quantity: true,
                    product: {
                        select: {
                            id: true,
                            websitePrice: true,
                        },
                    },
                },
            },
        },
    },
};

const userData = await prisma.user.findUnique({
    relationLoadStrategy: 'join',

    where: {
        id: user.id,
    },

    select,
});