Question

我无法运行节点src / index.js，它会引发错误。但是nodemon没问题。如何运行其生产版本？

PS D:\Development\server\Image hosting\node-express-server-rest-api-master> node   src/index.js
D:\Development\server\Image hosting\node-express-server-rest-api-master\src\index.js:2
import cors from 'cors';

SyntaxError: Cannot use import statement outside a module

这是一个非常简单的项目和文件：我尝试了“ type”：“ module”，但是它引发了新的错误。什么都没做，尽管这只是一个示例项目

package.json ：

{
"name": "node-express-server-rest-api",
"version": "0.1.0",
"description": "Node imgs hosting",
"scripts": {
    "start": "nodemon --exec babel-node src/index.js",
    "test": "echo \"No test specified\" && exit 0",
    "production": "NODE_ENV=production node src/index.js",
    "win-prod": "set NODE_ENV=production && node   src/index.js"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
    "@babel/core": "^7.11.6",
    "@babel/node": "^7.0.0",
    "@babel/preset-env": "^7.1.6",
    "@babel/register": "^7.0.0"
},
"dependencies": {
    "body-parser": "^1.19.0",
    "cors": "^2.8.5",
    "dotenv": "^8.2.0",
    "express": "^4.17.1",
    "follow-redirects": "^1.13.0",
    "mkdirp": "^1.0.4",
    "uuid": "^7.0.3"
  }
 }

index.js

require('dotenv/config');
import cors from 'cors';
import express from 'express';


import routes from './routes';
const bodyParser = require("body-parser");

const app = express();


app.use(cors());

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());


app.use((req, res, next) => {
// req.context = {
//     models,
//     me: models.users[1],
// };
next();
});


app.use('/upload', routes.upload);


app.listen(process.env.PORT, () =>
 console.log(`Example app listening on port ${process.env.PORT}!`),
);

Answer 1

我将答案发布在这里。

添加此模块：npm i esm

在根文件夹下再添加一个文件我将其命名为main.js：

require = require("esm")(module /*, options*/ )
module.exports = require("./src/index.js")

更改package.json启动脚本从这个：

 "win-prod": "set NODE_ENV=production && node -r src/index.js"

对此：

 "win-prod": "set NODE_ENV=production && node -r esm main.js"

Node.js运行js错误：无法在模块外部使用import语句

1 个答案: