ChangeItemQuantity

ChangeItemQuantity: (
    id: GroceryListId,
    itemName: ItemName,
    quantity: ItemQuantity,
) => Promise<GroceryList>

Type declaration

- (
      id: GroceryListId,
      itemName: ItemName,
      quantity: ItemQuantity,
  ): Promise<GroceryList>
- Parameters
  - ```
  id: GroceryListId
```
- ```
itemName: ItemName
```
  - ```
  quantity: ItemQuantity
```
Returns Promise<GroceryList>