text: const http = require("http");
  const app = require("./app");
  
  const normalizePort = val => {
    const port = parseInt(val, 10);
  
    if (isNaN(port)) {
      return val;
    }
    if (port >= 0) {
      return port;
    }
    return false;
  };
  const port = normalizePort(process.env.PORT || "3000");
  app.set("port", port);
  
  const errorHandler = error => {
    if (error.syscall !== "listen") {
      throw error;
    }
    const address = server.address();
    const bind =
      typeof address === "string" ? "pipe " + address : "port: " + port;
    switch (error.code) {
      case "EACCES":
        console.error(bind + " requires elevated privileges.");
        process.exit(1);
        break;
      case "EADDRINUSE":
        console.error(bind + " is already in use.");
        process.exit(1);
        break;
      default:
        throw error;
    }
  };
  
  const server = http.createServer(app);
  
  server.on("error", errorHandler);
  server.on("listening", () => {
    const address = server.address();
    const bind = typeof address === "string" ? "pipe " + address : "port " + port;
    console.log("Listening on " + bind);
  });
  
  // Web sockets
  const io = require("socket.io")(server);
  
  io.sockets.on("connection", socket => {
    console.log("Client connected: " + socket.id);
  
    // Lister les évènements ici
    socket.on("event", data => socket.broadcast.emit("event", data));
  
    socket.on("disconnect", () => console.log("Client has disconnected"));
  });
  
  server.listen(port);
  