interface FexError<T = any> extends Error {
    isFexError: boolean;
    response?: FexResponse<T>;
    request?: Response;
    config: FetchConfig;
    cause?: any;
}
type FexErrorHandler<T = any> = (error: FexError<T>) => unknown;
type XOR<T, U> = (T | U) extends object ? (T extends U ? never : T) | (U extends T ? never : U) : T | U;
type FetchConfig = Omit<RequestInit, "headers" | "signal"> & {
    headers: Record<string, string>;
    baseURL?: string;
    url?: string;
    timeout?: number;
    cancelToken?: FexCancelToken;
} & XOR<{
    mode?: RequestMode;
}, {
    withCredentials?: boolean;
}>;
interface FexResponse<T = any> {
    data: T;
    status: number;
    statusText: string;
    headers: Headers;
    config: FetchConfig;
    request: Response;
}
declare class FexCancelToken {
    private controller;
    promise: Promise<void>;
    reason?: string;
    constructor();
    cancel: (message?: string) => void;
    get signal(): AbortSignal;
}
declare class FexInstance {
    private defaultConfig;
    interceptors: {
        request: {
            use: (onFulfilled: (config: FetchConfig) => FetchConfig, onRejected?: (error: FexError) => unknown) => void;
        };
        response: {
            use: (onFulfilled: <T>(response: FexResponse<T>) => FexResponse<T> | Promise<FexResponse<T>>, onRejected?: FexErrorHandler) => void;
        };
    };
    private requestInterceptors;
    private responseInterceptors;
    constructor(config?: Partial<FetchConfig>);
    private request;
    get<T>(url: string, config?: Partial<FetchConfig>): Promise<FexResponse<T>>;
    post<T>(url: string, data?: unknown, config?: Partial<FetchConfig>): Promise<FexResponse<T>>;
    put<T>(url: string, data?: unknown, config?: Partial<FetchConfig>): Promise<FexResponse<T>>;
    delete<T>(url: string, config?: Partial<FetchConfig>): Promise<FexResponse<T>>;
    options<T>(url: string, config?: Partial<FetchConfig>): Promise<FexResponse<T>>;
    create(config?: Partial<FetchConfig>): FexInstance;
}
declare const fex: FexInstance;
export default fex;
export { FexCancelToken, FetchConfig, FexResponse, FexError, FexInstance };