What are the various methods of importing in JavaScript?

In my TypeScript file, I am importing three classes in different ways.

import * as THREE from 'three'
import Stats from 'three/examples/jsm/libs/stats.module'
import {OrbitControls} from 'three/examples/jsm/controls/OrbitControls'

Coming from a background in c# and Lua, the differences in import styles confuse me. My questions are:

  1. How do I determine which import style to use?
  2. What is the purpose of using '*' in the first line without specifying a path - considering 'three' is not located in the root directory?
  3. Why does OrbitControls need to be defined within an object? Even though it can be constructed like 
    new OrbitControls(camera, renderer.domElement );
    , I fail to see the reason behind it. Does this method add OrbitControls to the global space? If so, why is the { } necessary in the import statement?

I grasp the concept behind the Stats import, as it appears straightforward. It returns a Stats object with a specified relative path.

javascripttypescriptimportmodulethree.js

Answer №1

Alright, let me break it down for you:

// within styles.js
const RED = "red"
export const PINK = "pink"
const BLUE = "blue"
export {
  BLUE
}
export default RED


//in another file
import example (the name doesn't really matter),{BLUE, PINK as LIGHT_PINK (changing the name of the exported variable) } from "./styles"
console.log(example) //=>red

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