import * as React from 'react';
import { IUniversalInterfaceProps } from '../typing';
export declare type TMargin = [number, number, number, number];
export declare type TRect = [number, number, number, number];
export declare const getElRect: (el: any) => [number, number, number, number];
export declare const getRootRect: ([top, right, bottom, left]: [number, number, number, number]) => [number, number, number, number];
export interface IViewportScrollSensorProps extends IUniversalInterfaceProps<IViewportScrollSensorState> {
    margin?: TMargin;
    threshold?: number;
    throttle?: number;
    poll?: number;
    onChange?: (state: IViewportScrollSensorState) => void;
}
export interface IViewportScrollSensorState {
    visible: boolean;
}
export declare class ViewportScrollSensor extends React.Component<IViewportScrollSensorProps, IViewportScrollSensorState> {
    static defaultProps: any;
    mounted: boolean;
    el: HTMLElement;
    pollTimer: any;
    state: IViewportScrollSensorState;
    ref: (originalRef: any) => (el: any) => void;
    componentDidMount(): void;
    componentWillUnmount(): void;
    poll: () => void;
    onCalculation(visible: any, rectRoot: TRect, rectEl: TRect, rectIntersection: TRect): void;
    onScroll: any;
    render(): React.SFCElement<{
        ref: (el: any) => void;
    }>;
}