import { HttpClient, HttpContext, HttpHeaders, HttpParams } from "@angular/common/http";
import * as i0 from "@angular/core";
export type FetchOptions = {
    headers?: HttpHeaders | {
        [header: string]: string | string[];
    };
    context?: HttpContext;
    params?: HttpParams | {
        [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
    };
    body?: any;
    observe?: 'body' | 'events' | 'response';
    reportProgress?: boolean;
    responseType?: 'arraybuffer' | 'blob' | 'json' | 'text';
    withCredentials?: boolean;
};
export declare class Fetch {
    private http;
    constructor(http: HttpClient);
    get<T>(url: string, options?: FetchOptions, returnError?: boolean): Promise<T>;
    put<T>(url: string, body: any, options?: FetchOptions, returnError?: boolean): Promise<T>;
    post<T>(url: string, body: any, options?: FetchOptions, returnError?: boolean): Promise<T>;
    patch<T>(url: string, body: any, options?: FetchOptions, returnError?: boolean): Promise<T>;
    delete<T>(url: string, options?: FetchOptions, returnError?: boolean): Promise<T>;
    private request;
    static ɵfac: i0.ɵɵFactoryDeclaration<Fetch, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<Fetch>;
}