如何在js中返回匿名函数？

Question

I have the following code in my node project.

import Joi from 'joi';

module.exports = function() {
    Joi.objectId = require('joi-objectid')(Joi);
}

When I try to

export default function() {

it doesn't work. How can I export this function using export rather than using es5 module.exports?

Answer 1

给它命名或将其分配给变量：

export default function myFunc() {...}

Answer 2

You can write like this

import Joi from 'joi';       
  const myFunc = () => {
    Joi.objectId = require('joi-objectid')(Joi);
  }
export default myFunc; 

Answer 3

Since your environment is "nodejs", you probably are not using any transpilers. This mean you have to follow nodejs extensions to allow es6 modules.

To enable es6 modules, you first need to change the extension of your script to mjs , then start nodejs using node --experimental-modules index.mjs

See also https://nodejs.org/api/esm.html