import { HttpClient, HttpHandler, HttpHeaders, HttpParams, HttpRequest } from '@angular/common/http';
import { Observable } from 'rxjs';
export declare type HttpObserve = 'body' | 'events' | 'response';
export declare class BaseHttpClient extends HttpClient {
    private _env;
    constructor(_env: any, handler: HttpHandler);
    request(first: string | HttpRequest<any>, url?: string, options?: {
        body?: any;
        headers?: HttpHeaders | {
            [header: string]: string | string[];
        };
        observe?: HttpObserve;
        params?: HttpParams | {
            [param: string]: string | string[];
        };
        reportProgress?: boolean;
        responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
        withCredentials?: boolean;
    }): Observable<any>;
}