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main.jsx
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main.jsx
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import React, { useState, useRef, useLayoutEffect } from 'react';
import { render } from 'react-dom';
import useInterval from 'use-interval';
import useStayScrolled from 'react-stay-scrolled';
const message = { text: 'foo' };
const initialMessages = [
message,
message,
message,
message,
message,
message,
message,
];
const style = {
display: 'inline-block',
width: '100px',
height: '250px',
overflow: 'auto',
border: '1px solid #000',
};
const App = () => {
const divRef = useRef(null);
const { stayScrolled } = useStayScrolled(divRef);
const [messages, setMessages] = useState(initialMessages);
useInterval(() => {
setMessages((prevMessages) => prevMessages.concat([message]));
}, 500);
useLayoutEffect(() => {
stayScrolled();
}, [messages]);
return (
<div ref={divRef} style={style}>
{/* eslint-disable-next-line react/no-array-index-key */}
{messages.map(({ text }, i) => <div key={i}>{`${text} ${i}`}</div>)}
</div>
);
};
render(
<App />,
document.getElementById('demo'),
);