import React from 'react';
export interface IProps extends React.DetailedHTMLProps<React.TextareaHTMLAttributes<HTMLTextAreaElement>, HTMLTextAreaElement> {
    onChange: (value: string) => void;
    value: string;
    ref?: any;
}
interface IState {
    valueStack: string[];
    redoStack: string[];
}
export default class Textarea extends React.PureComponent<IProps, IState> {
    static getDerivedStateFromProps(nextProps: IProps, prevState: IState): {
        valueStack: string[];
        redoStack: string[];
    } | null;
    constructor(props: IProps);
    private scrollTop;
    textarea: HTMLTextAreaElement;
    undo: () => void;
    redo: () => void;
    blur: () => void;
    private changeValue;
    handleFocus: (e: React.FocusEvent<HTMLTextAreaElement>) => void;
    render(): JSX.Element;
}
export {};