import { MockXhr } from "mock-xmlhttprequest";
import { Method } from "../models/types";
export declare class OverridingService {
    private static instance;
    static getInstance(): OverridingService;
    private constructor();
    fakeFetch: (input: string | Request, init: {
        method: Method;
    }) => Promise<any>;
    fakeXhr: (xhr: MockXhr) => void;
}