/**
 * `fetch`, always called with a URL string.
 *
 * Themes and apps wrap `window.fetch` to watch cart requests, and many of those
 * wrappers read the first argument as a string:
 * `if (arguments[0].includes("/cart/add"))`. Given a `Request` or a `URL`, such
 * a wrapper throws after it has already sent the request, so the caller never
 * gets the response. The Swish API client builds `Request` objects and
 * `ui.css` entries are `URL`s, so on a store with one of these wrappers every
 * Swish API call came back empty and no `<swish-ui>` element hydrated
 * (SWI-3168).
 *
 * Every request the SDK makes goes through here, so a wrapper only ever sees
 * `(string, init)` from Swish. `fetch-with-string-url.test.ts` fails on a
 * direct `fetch()` call anywhere else in the SDK.
 */
export declare function fetchWithStringUrl(input: string | URL | Request, init?: RequestInit): Promise<Response>;