import { HttpHandler, HttpInterceptor, HttpRequest, HttpEvent } from '@angular/common/http';
import { Observable } from 'rxjs';
import { InjectionToken } from '@angular/core';
/**
 * `HttpHandler` which applies an `HttpInterceptor` to an `HttpRequest`.
 *
 * @see https://github.com/angular/angular/blob/6.0.x/packages/common/http/src/interceptor.ts#L52
 */
export declare class HttpInterceptorHandler implements HttpHandler {
    private next;
    private interceptor;
    constructor(next: HttpHandler, interceptor: HttpInterceptor);
    handle(req: HttpRequest<any>): Observable<HttpEvent<any>>;
}
/**
 * A multi-provider token which represents the array of `HttpInterceptor`s that
 * are registered for ApiHttp
 *
 *
 */
export declare const API_HTTP_INTERCEPTORS: InjectionToken<HttpInterceptor[]>;
export declare const API_HTTP_INTERCEPTORS_INJECTION_TOKEN: InjectionToken<InjectionToken<HttpInterceptor[]>>;