Fix merchandise {is: string} typo to {id: string} in useOptimisticCart

[J8118]

Title

Fix merchandise: {is: string} typo to {id: string} in useOptimisticCart

Description

Summary

The default generic type parameter for useOptimisticCart has merchandise: {is: string} on line 50, which should be merchandise: {id: string}. This is a single-character typo (is vs id) in the TypeScript generic default.

This affects consumers who rely on the default type parameter (i.e., don't pass an explicit type argument to useOptimisticCart). TypeScript won't correctly type-check merchandise.id accesses when using the default generic.

File changed:

• packages/hydrogen/src/cart/optimistic/useOptimisticCart.tsx (line 50)

Before:

export function useOptimisticCart<
  DefaultCart = {
    lines?: {
      nodes: Array<{id: string; quantity: number; merchandise: {is: string}}>;
    };
  },
>

After:

export function useOptimisticCart<
  DefaultCart = {
    lines?: {
      nodes: Array<{id: string; quantity: number; merchandise: {id: string}}>;
    };
  },
>