import React from 'react';
import { NativeProps } from '../_util/withNativeProps';
import { TdBackTopProps } from './type';
export type ThemeList = 'round' | 'half-round' | 'round-dark' | 'half-round-dark';
export type BackTopProps = TdBackTopProps & NativeProps;
export declare const defaultProps: {
    fixed: boolean;
    icon: string;
    target: any;
    text: string;
    theme: ThemeList;
    visibilityHeight: number;
};
declare const BackTop: React.FC<BackTopProps>;
export default BackTop;