declare const lang: {
    isArr: (arg: any) => arg is any[];
    baseIsNaN: (value: any) => boolean;
    isString: (arg?: any) => arg is string;
    isNumber: (arg?: any) => arg is number;
    isBoolean: (arg?: any) => arg is boolean;
    isText: (arg?: any) => arg is string | number;
    isFn: (arg: any) => arg is Function;
    isUndefined: (arg?: any) => arg is undefined;
    isNullOrUndefined: (arg?: any) => arg is null | undefined;
    isObject: (arg?: any) => arg is Object | Function;
};
export default lang;