import * as React from 'react';
export interface IViewportParams {
    placeholder: React.ReactElement<any>;
}
export declare type TViewport = <P>(Comp: React.StatelessComponent<P> | React.ComponentClass<P>, params: IViewportParams) => React.ComponentClass<P>;
export declare const viewport: (Comp: any, { placeholder }?: {
    placeholder?: React.DetailedReactHTMLElement<{
        style: {
            width: number;
            height: number;
            overflow: string;
        };
    }, HTMLElement>;
}) => {
    new (props: Readonly<any>): {
        onChange: () => void;
        render(): React.DetailedReactHTMLElement<React.InputHTMLAttributes<HTMLInputElement>, HTMLInputElement> | React.SFCElement<import("./ViewportObserverSensor").IViewportObserverSensorProps>;
        setState<K extends string | number | symbol>(state: any, callback?: () => void): void;
        forceUpdate(callBack?: () => void): void;
        readonly props: Readonly<{
            children?: React.ReactNode;
        }> & Readonly<any>;
        state: Readonly<any>;
        context: any;
        refs: {
            [key: string]: React.ReactInstance;
        };
        componentDidMount?(): void;
        shouldComponentUpdate?(nextProps: Readonly<any>, nextState: Readonly<any>, nextContext: any): boolean;
        componentWillUnmount?(): void;
        componentDidCatch?(error: Error, errorInfo: React.ErrorInfo): void;
        getSnapshotBeforeUpdate?(prevProps: Readonly<any>, prevState: Readonly<any>): any;
        componentDidUpdate?(prevProps: Readonly<any>, prevState: Readonly<any>, snapshot?: any): void;
        componentWillMount?(): void;
        UNSAFE_componentWillMount?(): void;
        componentWillReceiveProps?(nextProps: Readonly<any>, nextContext: any): void;
        UNSAFE_componentWillReceiveProps?(nextProps: Readonly<any>, nextContext: any): void;
        componentWillUpdate?(nextProps: Readonly<any>, nextState: Readonly<any>, nextContext: any): void;
        UNSAFE_componentWillUpdate?(nextProps: Readonly<any>, nextState: Readonly<any>, nextContext: any): void;
    };
    new (props: any, context?: any): {
        onChange: () => void;
        render(): React.DetailedReactHTMLElement<React.InputHTMLAttributes<HTMLInputElement>, HTMLInputElement> | React.SFCElement<import("./ViewportObserverSensor").IViewportObserverSensorProps>;
        setState<K extends string | number | symbol>(state: any, callback?: () => void): void;
        forceUpdate(callBack?: () => void): void;
        readonly props: Readonly<{
            children?: React.ReactNode;
        }> & Readonly<any>;
        state: Readonly<any>;
        context: any;
        refs: {
            [key: string]: React.ReactInstance;
        };
        componentDidMount?(): void;
        shouldComponentUpdate?(nextProps: Readonly<any>, nextState: Readonly<any>, nextContext: any): boolean;
        componentWillUnmount?(): void;
        componentDidCatch?(error: Error, errorInfo: React.ErrorInfo): void;
        getSnapshotBeforeUpdate?(prevProps: Readonly<any>, prevState: Readonly<any>): any;
        componentDidUpdate?(prevProps: Readonly<any>, prevState: Readonly<any>, snapshot?: any): void;
        componentWillMount?(): void;
        UNSAFE_componentWillMount?(): void;
        componentWillReceiveProps?(nextProps: Readonly<any>, nextContext: any): void;
        UNSAFE_componentWillReceiveProps?(nextProps: Readonly<any>, nextContext: any): void;
        componentWillUpdate?(nextProps: Readonly<any>, nextState: Readonly<any>, nextContext: any): void;
        UNSAFE_componentWillUpdate?(nextProps: Readonly<any>, nextState: Readonly<any>, nextContext: any): void;
    };
};