我已经使用Windows 10笔记本电脑很多年了，现在我换了一台MacBook。我从Github中提取了一些代码（使用与服务器完全相同的代码），当我点击保存时，Nodemon不想自动重启服务器。
index.js:

const express = require("express");
const path = require("path");
const cors = require("cors");
const bodyParser = require("body-parser");
const http = require("http");

const app = express();
const server = http.createServer(app);

app.use(express.json({ extended: false, limit: "5mb" }));
app.use(cors());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

if (process.env.NODE_ENV === "production") {
    app.use(express.static("client/build"));
    app.get("*", (req, res) =>
        res.sendFile(path.resolve(__dirname, "client", "build", "index.html"))
    );
}

const PORT = process.env.PORT || 3001;

server.listen(PORT, () => console.log(`Server started on port ${PORT}.`));

我做了一些更改，然后点击保存，然后我得到这个错误：

events.js:292
[0]       throw er; // Unhandled 'error' event
[0]       ^
[0] 
[0] Error: listen EADDRINUSE: address already in use :::3001

Package.json:

"scripts": {
        "start": "node index.js",
        "server": "nodemon index.js",
        "client": "npm start --prefix client",
        "dev": "concurrently \"npm run server\" \"npm run client\""
},

我想要的是，当我点击保存，它保存一切，然后在同一端口上重新启动服务器。一切都是自动的。我不想杀死服务器手动每次我保存。这一个工作在Windows 10，现在它不在我的MacBook...