import { HttpClient } from '@angular/common/http';
import { ApolloLink, Observable as LinkObservable, Operation, FetchResult } from 'apollo-link';
import { Options } from 'apollo-angular-link-http-common';
export declare class HttpLinkHandler extends ApolloLink {
    private httpClient;
    private options;
    requester: (operation: Operation) => LinkObservable<FetchResult> | null;
    constructor(httpClient: HttpClient, options: Options);
    request(op: Operation): LinkObservable<FetchResult> | null;
}
export declare class HttpLink {
    private httpClient;
    constructor(httpClient: HttpClient);
    create(options: Options): HttpLinkHandler;
}