M1_ProjetWeb/vite.config.ts

import { sveltekit } from '@sveltejs/kit/vite';
import { type ViteDevServer, defineConfig } from 'vite';

import { Server } from 'socket.io'

const webSocketServer = {
	name: 'webSocketServer',
	configureServer(server: ViteDevServer) {
		if (!server.httpServer) return

		const io = new Server(server.httpServer)

		io.on('connection', (socket) => {
			socket.emit('eventFromServer', 'Hello, World 👋')
		})
	}
}

export default defineConfig({
	plugins: [sveltekit(), webSocketServer]
});