js-buy-sdk（shopify-buy）を使ってShopifyのCheckoutを作成するとエラーが発生する 😱

ことの発端

README の記載に従って、

import Client from 'shopify-buy';

// Initializing a client to return content in the store's primary language
const client = Client.buildClient({
  domain: 'your-shop-name.myshopify.com',
  storefrontAccessToken: 'your-storefront-access-token'
});

// Create an empty checkout
client.checkout.create().then((checkout) => {
  // Do something with the checkout
  console.log(checkout);
});

という感じで、checkoutを作成したところ、

Error: [{"message":"Field 'presentmentPrices' doesn't exist on type 'ProductVariant'","locations":[{"line":1,"column":94}],"path":["fragment VariantFragment","presentmentPrices"],"extensions":{"code":"undefinedField","typeName":"ProductVariant","fieldName":"presentmentPrices"}},{"message":"Field 'description' doesn't exist on type 'ScriptDiscountApplication'","locations":[{"line":1,"column":904}],"path":["fragment DiscountApplicationFragment","... on ScriptDiscountApplication","description"],"extensions":{"code":"undefinedField","typeName":"ScriptDiscountApplication","fieldName":"description"}}]

と、エラーが発生したので原因を調査しました。