starting template socket.io typescript node in javascript

To create a template for a socket.io server using TypeScript in Node.js, follow these steps:

Initialize a new Node.js project:


npm init -y
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Install the required dependencies:


npm install --save express socket.io @types/express @types/socket.io typescript ts-node nodemon
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Create a tsconfig.json file with the following content:


{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "outDir": "build",
    "sourceMap": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "**/*.spec.ts"]
}
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Create a src/index.ts file with the following content:


index.ts
import express from 'express';
import http from 'http';
import { Server } from 'socket.io';

const app = express();
const server = http.createServer(app);
const io = new Server(server);

io.on('connection', (socket) => {
  console.log('a user connected');

  socket.on('disconnect', () => {
    console.log('user disconnected');
  });

  socket.on('chat message', (msg) => {
    console.log('message: ' + msg);
    io.emit('chat message', msg);
  });
});

server.listen(3000, () => {
  console.log('listening on *:3000');
});
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Add the following scripts to package.json:


{
  "scripts": {
    "start": "nodemon --watch 'src/**/*.ts' --exec 'ts-node' src/index.ts",
    "build": "tsc"
  }
}
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Run the project in development mode with:


npm start
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This will start the server and listen to port 3000. You can test it by opening multiple tabs at http://localhost:3000/ and sending chat messages.

Build and run the project in production mode with:


npm run build
node build/index.js
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This will compile TypeScript into JavaScript and run the server with the compiled code.

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