Add item to wishlist

import { createSpreeClient } from '@spree/sdk'

const client = createSpreeClient({
  baseUrl: 'https://your-store.com',
  publishableKey: '<api-key>',
})

const item = await client.store.wishlists.items.create('wl_abc123', {
  variant_id: 'variant_abc123',
  quantity: 1,
}, {
  bearerToken: '<token>',
})

{
  "id": "wi_gbHJdmfrXB",
  "variant_id": "variant_gbHJdmfrXB",
  "wishlist_id": "wl_UkLWZg9DAJ",
  "quantity": 1,
  "created_at": "2026-03-06T16:06:54.181Z",
  "updated_at": "2026-03-06T16:06:54.181Z",
  "variant": {
    "id": "variant_gbHJdmfrXB",
    "product_id": "prod_gbHJdmfrXB",
    "sku": "SKU-146",
    "is_master": true,
    "options_text": "",
    "track_inventory": true,
    "image_count": 0,
    "created_at": "2026-03-06T16:06:54.156Z",
    "updated_at": "2026-03-06T16:06:54.167Z",
    "thumbnail": null,
    "purchasable": true,
    "in_stock": false,
    "backorderable": true,
    "weight": 0,
    "height": null,
    "width": null,
    "depth": null,
    "price": {
      "id": "price_gbHJdmfrXB",
      "amount": "19.99",
      "amount_in_cents": 1999,
      "compare_at_amount": null,
      "compare_at_amount_in_cents": null,
      "currency": "USD",
      "display_amount": "$19.99",
      "display_compare_at_amount": null,
      "price_list_id": null
    },
    "original_price": null,
    "option_values": []
  }
}