import * as React from 'react';
export declare const isString: (value: any) => boolean;
export declare const isNumber: (value: any) => boolean;
export declare const getColumnWidthList: (nodeList: React.ReactElement) => number[];
export declare const getWrapWidth: (nodelist: React.ReactElement) => number;
export declare const getItemWidth: (children: React.ReactElement) => number;
export declare const renderReactNodeFunction: (reactNode: React.ReactNode) => any;
export declare const isElementInViewport: (el: any) => boolean;
export declare const DEFAUTL_PADDING = 15;