Handling Memory Leaks in a React Component Using a WebSocket Connection
I'm working on a project and hit a roadblock. I've been working on this all day and I'm attempting to set up I'm working with a memory leak scenario in my React component that manages a WebSocket connection... The component continuously receives data from the WebSocket, but once it unmounts, I'm still seeing network activity in the browser's performance tab. I've tried cleaning up the WebSocket connection in the `componentWillUnmount` lifecycle method, but it seems like there are still references keeping the component in memory. Here’s a snippet of my component: ```javascript import React, { useEffect, useState } from 'react'; const WebSocketComponent = () => { const [data, setData] = useState(null); const socket = new WebSocket('ws://example.com/socket'); useEffect(() => { socket.onmessage = (event) => { setData(event.data); }; return () => { socket.close(); }; }, []); return <div>{data}</div>; }; export default WebSocketComponent; ``` When I navigate away from this component, the WebSocket connection should close, but I also checked the `Network` tab and noticed that the connection remains even after the component unmounts. I suspect that the event listener on `socket.onmessage` might be causing a closure scenario preventing garbage collection. I've also tried adding a check for the component's mounted status with a flag, but that didn’t solve the question. Is there a proper way to handle WebSocket connections in React to avoid memory leaks, or am I missing something in the cleanup process? I’m using React 17.0.2 and the browser is Chrome 92. Any advice would be much appreciated. I recently upgraded to Javascript stable. What's the best practice here? What's the correct way to implement this?