import 'event-target-polyfill';
import 'yet-another-abortcontroller-polyfill';
import { Observable } from 'rxjs';
export declare type ErrorResponse = {
    error: boolean;
    message: string;
};
export declare function isErrorResponse<TData>(response: TData | ErrorResponse): response is ErrorResponse;
/**
 *
 * @param input The resource you would like to fetch. Can be a url or a request object.
 * @returns Observable of JSON or ErrorResponse
 */
export declare function fromHttpRequest<TData>(input: string | Request): Observable<TData | ErrorResponse>;