Currently, I am going through an interesting article that includes the following type definition:
export type CartItem = {
productId: Product['id'];
quantity: number;
total: number;
};
From what I gather, it seems like the productId property must match the type assigned to product['id']. Just in case, here is how it's defined:
export type Product = {
id: ID;
title: string;
description: string;
price: number;
};
Indeed, Product['id'] represents an indexed access type (also referred to as a lookup type) that retrieves the data type of the property id from the parent type Product, which is denoted by ID.
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