/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Observable } from 'rxjs';
import { HttpBackend, HttpHandler } from './backend';
import { HttpRequest } from './request';
import { HttpEvent } from './response';
export declare const JSONP_ERR_NO_CALLBACK = "JSONP injected script did not invoke callback.";
export declare const JSONP_ERR_WRONG_METHOD = "JSONP requests must use JSONP request method.";
export declare const JSONP_ERR_WRONG_RESPONSE_TYPE = "JSONP requests must use Json response type.";
/**
 * DI token/abstract type representing a map of JSONP callbacks.
 *
 * In the browser, this should always be the `window` object.
 *
 *
 */
export declare abstract class JsonpCallbackContext {
    [key: string]: (data: any) => void;
}
/**
 * `HttpBackend` that only processes `HttpRequest` with the JSONP method,
 * by performing JSONP style requests.
 *
 * @publicApi
 */
export declare class JsonpClientBackend implements HttpBackend {
    private callbackMap;
    private document;
    constructor(callbackMap: JsonpCallbackContext, document: any);
    /**
     * Get the name of the next callback method, by incrementing the global `nextRequestId`.
     */
    private nextCallback;
    /**
     * Process a JSONP request and return an event stream of the results.
     */
    handle(req: HttpRequest<never>): Observable<HttpEvent<any>>;
}
/**
 * An `HttpInterceptor` which identifies requests with the method JSONP and
 * shifts them to the `JsonpClientBackend`.
 *
 * @publicApi
 */
export declare class JsonpInterceptor {
    private jsonp;
    constructor(jsonp: JsonpClientBackend);
    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;
}