我检查了几个答案和指南，但无法使所有部分协同工作 .

定义了一个非常简单的Node / Express项目（test2）主文件是index.js

这是我的project.js

{
  "name": "test2",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "babel": {
    "presets": [ "es2017" ]
  },
  "scripts": {
    "babel-node": "babel-node --presets=es2017",
    "start": "nodemon --exec npm run babel-node -- ./dist/index.js",
    "build": "babel src -d dist"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "babel-preset-env": "^1.6.1",
    "express": "^4.16.2"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-es2017": "^6.24.1",
    "babel-preset-stage-2": "^6.24.1",
    "babel-register": "^6.11.6",
    "nodemon": "^1.10.0",
    "ws": "3.3.2"
  }
}

我的一个文件中有一个es6命令：console.log（Date.now（） . toDateString（）“：”text.padStart（indent））;

我执行了npm start并且它构建了dist库，但它看起来在这个库下它并没有改变代码，我也可以看到padStart和toDateString . （在上面使用'use strict' - 确实发生了一些事情）

当我尝试运行它时，我得到：

> npm start

> test2@1.0.0 start D:\MyData\newJSTests\express\test2
> nodemon --exec npm run babel-node -- ./dist/index.js

[nodemon] 1.14.11
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: *.*
[nodemon] starting `npm run babel-node ./dist/index.js`

> test2@1.0.0 babel-node D:\MyData\newJSTests\express\test2
> babel-node --presets=es2017 "./dist/index.js"

events.js:183
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE :::3000
...

我尝试过放入project.js：

"scripts": {
    "start": "nodemon dist/index.js --exec babel-node --presets es2017,stage-2",
    "build": "babel lib -d dist",
    "serve": "node dist/index.js",
    "test": "mocha --compilers js:babel-register"
  },

但得到同样的问题 . 我可能错过了一些东西 . 将获得一些帮助 . 谢谢

编辑：1 . 我的错误 - 关于端口，但是，2 . 看起来巴贝尔转换不好 .

D:\MyData\newJSTests\express\test2>npm start

> test2@1.0.0 start D:\MyData\newJSTests\express\test2
> nodemon --exec npm run babel-node -- ./dist/index.js

[nodemon] 1.14.11
[nodemon] ...
[nodemon] starting `npm run babel-node ./dist/index.js`

> test2@1.0.0 babel-node D:\MyData\newJSTests\express\test2
> babel-node --presets=es2017 "./dist/index.js"

listening on port 3000!
TypeError: Date.now(...).toDateString is not a function
    at Object.myLogger (D.../dist/tools/logger.js:8:36)
javascript node.js babel