import { Request } from "./Request";
import { Response } from "./Response";
export declare class Client<Error = never> {
    url?: string | undefined;
    key?: string | undefined;
    preprocess: (request: Request) => Promise<Request>;
    getHeader?: ((request: Request) => Promise<{
        aIM?: string | undefined;
        accept?: string[] | undefined;
        acceptCharset?: string[] | undefined;
        acceptDatetime?: string | undefined;
        acceptEncoding?: string[] | undefined;
        acceptLanguage?: string[] | undefined;
        accessControlRequestMethod?: string | undefined;
        accessControlRequestHeaders?: string | undefined;
        authorization?: string | undefined;
        cacheControl?: string | undefined;
        cfConnectionIp?: string | undefined;
        cfIpCountry?: string | undefined;
        connection?: string | undefined;
        contentLength?: string | undefined;
        contentMD5?: string | undefined;
        contentType?: string | undefined;
        cookie?: string | undefined;
        date?: string | undefined;
        expect?: string | undefined;
        forwarded?: string | undefined;
        from?: string | undefined;
        host?: string | undefined;
        http2Settings?: string | undefined;
        ifMatch?: string[] | undefined;
        ifModifiedSince?: string | undefined;
        ifNoneMatch?: string[] | undefined;
        ifRange?: string | undefined;
        ifUnmodifiedSince?: string | undefined;
        maxForwards?: string | undefined;
        origin?: string | undefined;
        pragma?: string | undefined;
        proxyAuthorization?: string | undefined;
        range?: string | undefined;
        referer?: string | undefined;
        te?: string[] | undefined;
        trailer?: string | undefined;
        transferEncoding?: string | undefined;
        userAgent?: string | undefined;
        upgrade?: string[] | undefined;
        via?: string[] | undefined;
        warning?: string | undefined;
        upgradeInsecureRequests?: string | undefined;
        xRequestedWith?: string | undefined;
        dnt?: string | undefined;
        xForwardedFor?: string | undefined;
        xForwardedHost?: string | undefined;
        xForwardedProto?: string | undefined;
        xMsContinuation?: string | undefined;
        frontEndHttps?: string | undefined;
        xHttpMethodOverride?: string | undefined;
        xAttDeviceId?: string | undefined;
        xWapProfile?: string | undefined;
        proxyConnection?: string | undefined;
        xCsrfToken?: string | undefined;
        xCorrelationID?: string | undefined;
        xModNonce?: string | undefined;
        xModRetry?: string | undefined;
        saveData?: string | undefined;
        xAuthToken?: string | undefined;
        xTrackingId?: string | undefined;
    }>) | undefined;
    appendHeader?: (request: Request) => Request.Header;
    postprocess: (response: Response) => Promise<Response>;
    onError?: (request: Request, response: Response) => Promise<boolean>;
    onUnauthorized?: (connection: Client<Error>) => Promise<boolean>;
    constructor(url?: string | undefined, key?: string | undefined, callbacks?: Partial<Pick<Client<Error>, "preprocess" | "getHeader" | "appendHeader" | "postprocess" | "onError" | "onUnauthorized">>);
    private fetch;
    get<R>(path: string, header?: Request.Header): Promise<R | Error>;
    post<R>(path: string, request: any, header?: Request.Header): Promise<R | Error>;
    delete<R>(path: string, header?: Request.Header): Promise<R | Error>;
    patch<R>(path: string, request: any, header?: Request.Header): Promise<R | Error>;
    put<R>(path: string, request: any, header?: Request.Header): Promise<R | Error>;
}