/**
 * SSR-aware fetch: the browser passes `/api/...` through as-is; on the
 * server, relative URLs are resolved against the incoming request's origin
 * (via @tanstack/react-start/server), falling back to APP_URL /
 * BETTER_AUTH_URL / localhost:3000 outside a request context.
 *
 * The server-only module uses a literal dynamic import so bundlers can analyze
 * the boundary statically; the `window` guard means it never runs in browsers.
 */
export declare function createIsomorphicFetch(options?: {
    fetch?: typeof fetch;
}): (input: RequestInfo | URL, init?: RequestInit) => Promise<Response>;
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