需要 NPM package 时的变量

Question

I see a lot of NPM packages using let or var .

eg: var firebase = require('firebase');

My inner OCD suggest these should always be defined as const variables.

Can anyone give a final answer on how these should be declared?

Answer 1

It's a good practice to create as const anything that you are not going to change the value. Since you're not going to change firebase object, you should import it to a const .

Answer 2

Node.js uses commonJS module. let and const is ES6 javascript syntax for declaring variables.

So requiring a module is usually declared with const

const express = require('express')