reactjsreact-tsx

How to pass socket connection to other components in React Typescript?


I have socket.io connection, I want to pass the original instance to other components. I am using Typescript React. It gives me error like:

Type '{ socket: Socket<DefaultEventsMap, DefaultEventsMap>; }' is not assignable to type 'IntrinsicAttributes'.
  Property 'socket' does not exist on type 'IntrinsicAttributes'.ts(2322)

My code: main.tsx

import React from "react";
import ReactDOM from "react-dom/client";
import App from "./App";
import "./index.css";
import { io } from "socket.io-client";

const socket = io("http://localhost:8081");

ReactDOM.createRoot(document.getElementById("root")!).render(
  <React.StrictMode>
    <App socket={socket}/> //getting error from socket
  </React.StrictMode>
);

Solution

  • I would create a wrapper around the socket, something like this (the code is in typescript):

    // Singleton
    class MySocket {
       public socket:Socket;
       public static instance: MySocket = new MySocket();
    
       private constructor() {
          socket = io("http://localhost:8081");
       }
    
       public doSomething(){
          //...
       }
    
       public doOtherThings(){
          //...
       }
    }
    

    Then I would use it like this:

    // Component A
    const ComponentA = () => {
       useEffect(()=>{
          MySocket.instance.doSomething();
       },[]);
    }
    
    export default ComponentA
    
    // Component B
    const ComponentB = () => {
       useEffect(()=>{
          MySocket.instance.doOtherThings();
       },[]);
    }
    
    export default ComponentB
    

    But, with your approach I think you can go this way:

    interface Props {
       socket: Socket<DefaultEventsMap, DefaultEventsMap>
    }
    const App = (props:Props)=>{
    }
    

    and you should be able to pass the socket instance you are creating it in the main.tsx to the App component.