import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http';
import { Observable } from 'rxjs';
import { LoadingDictionary } from "../types/loading-dictionary";
import { RequestIdGeneratorStrategy } from "../interfaces/request-id-generator-strategy";
import { RequestFilterStrategy } from "../interfaces/request-filter-strategy";
export declare class RegistryLoadingInterceptor implements HttpInterceptor {
    private readonly requestIdGenerator;
    private readonly requestFilter;
    /**
     * registry exposing the loading state of watched http requests
     */
    loadingState$: Observable<LoadingDictionary>;
    /**
     *  monitors if any http request is loading by counting references.
     */
    isAnyRequestLoading$: Observable<boolean>;
    private readonly loadingDictionary;
    private readonly stateChangeTrigger$;
    private readonly networkRequestCounter$;
    constructor(requestIdGenerator: RequestIdGeneratorStrategy, requestFilter: RequestFilterStrategy);
    private static mapEventTypeToLoading;
    intercept(request: HttpRequest<unknown>, delegate: HttpHandler): Observable<HttpEvent<unknown>>;
    private mapHttpEventToLoadingState$;
    private mapHttpEventToLoadingCount$;
    private updateLoadingState;
    private updateLoadingCounter;
    private getRequestId;
    private incrementCounter;
    private decrementCounter;
}