import { Provider } from '@angular/core';
import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http';
import { Observable } from 'rxjs';
import { AppCheck } from '@angular/fire/app-check';
import * as i0 from "@angular/core";
export declare class FirebaseAppCheckHttpInterceptor implements HttpInterceptor {
    readonly appCheck: AppCheck;
    private readonly enabled;
    private readonly urlPattern;
    constructor(appCheck: AppCheck, urlPattern: RegExp | RegExp[], enabled: boolean | null);
    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>;
    private isMatch;
    static ɵfac: i0.ɵɵFactoryDeclaration<FirebaseAppCheckHttpInterceptor, [null, null, { optional: true; }]>;
    static ɵprov: i0.ɵɵInjectableDeclaration<FirebaseAppCheckHttpInterceptor>;
}
export declare const FIREBASE_APP_CHECK_HTTP_INTERCEPTOR: Provider;
