import { InjectionToken } from '@angular/core';
export declare const HttpServiceBaseUrl: InjectionToken<unknown>;
export interface HttpOptions {
    /** Http request ID */
    id?: string;
    query?: any;
    pathType?: 'relative' | 'absolute';
    responseType?: 'json' | 'blob' | 'text';
    contentType?: 'json' | 'multipart/form-data';
    reportProgress?: boolean;
    observe?: "response" | "body" | "events";
    displayServerErrors?: boolean;
    sendAuthToken?: boolean;
    /** Save response in transfer state */
    transferState?: {
        enable: boolean;
        clearAfterUse?: boolean;
    };
}
export declare abstract class HttpEvent {
    readonly url: string;
    readonly options?: HttpOptions;
    constructor(url: string, options?: HttpOptions);
}
export declare class HttpRequestSendEvent extends HttpEvent {
    constructor(url: string, options?: HttpOptions);
}
export declare class HttpResponseEvent extends HttpEvent {
    constructor(url: string, options?: HttpOptions);
}
export declare class HttpErrorEvent extends HttpEvent {
    constructor(url: string, options?: HttpOptions);
}