declare const _default: {
    isNil: (value: any) => value is null | undefined;
    isDate: (value?: any) => value is Date;
    isRegExp: (value?: any) => value is RegExp;
    isUndefined: (value: any) => value is undefined;
    isObject: (value?: any) => value is object;
    isFunction: (value: any) => value is (...args: any[]) => any;
};
export default _default;