import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';
import { BehaviorSubject, Observable } from 'rxjs';
import { AuthenticationService } from './authentication.service';
import * as i0 from "@angular/core";
export declare class AuthenticationInterceptor implements HttpInterceptor {
    private authService;
    isRefreshingToken: boolean;
    tokenSubject: BehaviorSubject<string>;
    constructor(authService: AuthenticationService);
    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;
    private addTokenToRequest;
    private handle401Error;
    static ɵfac: i0.ɵɵFactoryDeclaration<AuthenticationInterceptor, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<AuthenticationInterceptor>;
}
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