import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http';
import { InjectionToken } from '@angular/core';
import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare const API_URL: InjectionToken<string>;
export declare const ABSOLUTE_URL_REGEXP: RegExp;
export declare class ApiUrlInterceptor implements HttpInterceptor {
    private apiUrl;
    private preparedUrl;
    constructor(apiUrl?: string);
    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;
    private isAbsoluteUrl;
    private prepareUrl;
    static ɵfac: i0.ɵɵFactoryDeclaration<ApiUrlInterceptor, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ApiUrlInterceptor>;
}