export declare class HttpRequest<T> {
    readonly url: string;
    /**
     * The request body, or `null` if one isn't set.
     *
     * Bodies are not enforced to be immutable, as they can include a reference to any
     * user-defined data type. However, interceptors should take care to preserve
     * idempotence by treating them as such.
     */
    readonly body: T | null;
    /**
     * Outgoing headers for this request.
     */
    readonly headers: any;
    /**
     * Whether this request should be made in a way that exposes progress events.
     *
     * Progress events are expensive (change detection runs on each event) and so
     * they should only be requested if the consumer intends to monitor them.
     */
    readonly reportProgress: boolean;
    /**
     * Whether this request should be sent with outgoing credentials (cookies).
     */
    readonly withCredentials: boolean;
    /**
     * The expected response type of the server.
     *
     * This is used to parse the response appropriately before returning it to
     * the requestee.
     */
    readonly responseType: 'arraybuffer' | 'blob' | 'json' | 'text';
    /**
     * Outgoing URL parameters.
     */
    readonly params: any;
    /**
     * The outgoing HTTP request method.
     */
    readonly method: string;
    /**
     * The outgoing URL with all URL parameters set.
     */
    readonly urlWithParams: string;
    constructor(method: string, url: string, third?: any, fourth?: any);
    /**
     * Transform the free-form body into a serialized format suitable for
     * transmission to the server.
     */
    serializeBody(): any;
    /**
     * Examine the body and attempt to infer an appropriate MIME type
     * for it.
     *
     * If no such type can be inferred, this method will return `null`.
     */
    detectContentTypeHeader(): string | null;
}