我可以在 NodeJS 的 require 函数中使用别名吗？

Question

I have an ES6 module that exports two constants:

export const foo = "foo";
export const bar = "bar";

I can do the following in another module:

import { foo as f, bar as b } from 'module';
console.log(`${f} ${b}`); // foo bar

When I use NodeJS modules, I would have written it like this:

module.exports.foo = "foo";
module.exports.bar = "bar";

Now when I use it in another module can I somehow rename the imported variables as with ES6 modules?

const { foo as f, bar as b } = require('module'); // invalid syntax
console.log(`${f} ${b}`); // foo bar

How can I rename the imported constants in NodeJS modules?

Answer 1

当然，只需使用对象解构语法：

 const { old_name: new_name, foo: f, bar: b } = require('module');

Answer 2

It is possible (tested with Node 8.9.4):

const {foo: f, bar: b} = require('module');
console.log(`${f} ${b}`); // foo bar

Answer 3

Yes, a simple destructure would adhere to your request.

Instead of:

var events = require('events');
var emitter = new events.EventEmitter();

You can write:

const emitter = {EventEmitter} = require('events');

emitter() will alias the method EventEmitter()

Just remember to instantiate your named function: var e = new emitter(); 😁

Answer 4

I would say it is not possible, but an alternative would be:

const m = require('module');
const f = m.foo;
const b = m.bar;