CommonJS 替代 ES6 作为别名导入

Question

ES6 can import an export as alias , like so;

import express from 'express'
import { express as playground } from 'graphql-playground/middleware'

Is there an alternative way to do this with CommonJS require('something') ? Or something that circumvents the above declaration issue if it were done the CommonJS way?

This throws an error.

const express = require('express')
const express = require('graphql-playground/middleware')

// SyntaxError: Identifier 'express' has already been declared

Answer 1

CommonJS is really just assigning values to variables and you can name the variables however you want:

const express = require('express');
const playground = require('graphql-playground/middleware').express;

Answer 2

For non-default exports (module.export = var) you can also alias with regular destructure syntax:

const {
  originName: newNameInFile
} = require('foo.js')