declare const _default: {
    forEach: (callback: any, thisArg: any) => void;
    map: (callback: any, thisArg: any) => any;
    filter: (fun: any) => any[];
    isArray: (arg: unknown) => boolean;
    Base64: {
        _keyStr: string;
        encode: (input: string) => string;
        _encode: (input: string) => string;
        decode: (input: string) => string;
        _decode: (input: string) => string;
    };
};
export default _default;