import React, { Component } from 'react';
interface IReadMoreProps {
    readonly initiallyCollapsed: boolean;
    readonly readMoreLabel: string;
    readonly cropAtHeight: string | number;
    readonly threshold: number;
    readonly onToggle: (on: boolean) => void;
}
declare class ReadMore extends Component<IReadMoreProps> {
    static defaultProps: {
        initiallyCollapsed: boolean;
        readMoreLabel: string;
        cropAtHeight: string;
        threshold: number;
        onToggle: () => void;
    };
    state: {
        collapsed: boolean;
    };
    componentDidMount(): void;
    componentWillUnmount(): void;
    protected childRef: React.RefObject<HTMLDivElement>;
    private observer;
    toggleCollapse: () => void;
    toggleCollapseLink: () => void;
    render(): JSX.Element;
}
export default ReadMore;