import type { SafeAny } from '@ngify/core';
import { Observable } from 'rxjs';
import type { HttpBackend } from './backend';
import type { HttpRequest } from './request';
import { type HttpEvent } from './response';
export declare class HttpXhrBackend implements HttpBackend {
    private factory;
    constructor(factory?: () => XMLHttpRequest);
    /**
     * Processes a request and returns a stream of response events.
     * @param req The request object.
     * @returns An observable of the response events.
     */
    handle(req: HttpRequest<SafeAny>): Observable<HttpEvent<SafeAny>>;
}