import { Writable } from 'svelte/store';
export interface UseFetchReturn<T> {
    error?: Writable<Error>;
    loading: Writable<boolean>;
    data?: Writable<T>;
    refetch: (resource: RequestInfo, init?: RequestInit) => void;
}
/**
 * fetch API hook includes
 * - polyfill `whatwg-fetch` to ensure cross browsers support
 * - leverage Svelte store for fetched data
 *
 * @returns GraphQL-alike `loading`, `error`, `data` and `refetch` function to trigger fetch
 */
export default function <T>(): UseFetchReturn<T>;