Express 支持 ES6 语法

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1. 更新 package.json

package.json 中添加 "type": "module"

{
  "name": "express-server",
  "version": "1.0.0",
  "type": "module",
  "scripts": {
    "start": "node src/app.js",
    "dev": "nodemon src/app.js"
  },
  "dependencies": {
    "express": "^4.21.2"
  },
  "devDependencies": {
    "nodemon": "^3.1.10"
  }
}