module.exports vs. export default in Node.js and ES6

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What is the difference between Node's module.exports and ES6's export default? I'm trying to figure out why I get the "__ is not a constructor" error when I try to export default in Node.js 6.2.2.

What works
'use strict'
class SlimShady {
  constructor(options) {
    this._options = options
  }

  sayName() {
    return 'My name is Slim Shady.'
  }
}

// This works
module.exports = SlimShady
What doesn't work
'use strict'
class SlimShady {
  constructor(options) {
    this._options = options
  }

  sayName() {
    return 'My name is Slim Shady.'
  }
}

// This will cause the "SlimShady is not a constructor" error
// if in another file I try `let marshall = new SlimShady()`
export default SlimShady

Named Export vs Default Export in ES6 - Alankar Anand, What is the difference between module exports and export default? module.exports vs. export default in Node.js and ES6. What is the difference between Node's module.exports and ES6's export default? I'm trying to figure out why I

You need to configure babel correctly in your project to use export default and export const foo

npm install --save-dev @babel/plugin-proposal-export-default-from

then add below configration in .babelrc

"plugins": [ 
       "@babel/plugin-proposal-export-default-from"
      ]

Node.js, can be a function, a class, an object or anything else. ES6 provides two ways to export a module from a file: named export and default export. Named Export: (export) With named exports, one can have multiple named exports per file.

Felix Kling did a great comparison on those two, for anyone wondering how to do an export default alongside named exports with module.exports in nodejs

module.exports = new DAO()
module.exports.initDAO = initDAO // append other functions a named export

// now you have
let DAO = require('_/helpers/DAO');
// DAO by default is exported class or function
DAO.initDAO()

What is "export default" in javascript?, is an object that is exposed as a module. Qual è la differenza tra Node module.exportse ES6 export default? Sto cercando di capire perché ottengo l'errore "__ non è un costruttore" quando provo export defaultin Node.js 6.2.2. Cosa funziona 'use strict' class SlimShady {constructor (options) {this. _options = options } sayName {return 'My name is Slim Shady.'

tl;dr right now for this to work, the file that is requiring or importing SlimShady must be compiled using Babel with 'use strict'.

I'm using babel-cli 6.18.0 in the project where I initially encountered this error.

Without 'use strict' is Bad News Bears
var SlimShady = require('./slim-shady');
var marshall = new SlimShady();  // uh, oh...
'use strict', please
'use strict'
import SlimShady from './slim-shady'
var marshall = new SlimShady()  // all good in the hood

What does "export default" do in JSX?, function() { } can be used when the function has no name. It's a named export vs a default export. export const is a named export that exports a const declaration or declarations. To emphasize: what matters here is the export keyword as const is used to declare a const declaration or declarations. export may also be applied to other declarations such as class or function declarations.

module.exports vs. export default in Node.js and ES6 , ES6 provides two ways to export a module from a file: named export and default export. With named exports, one can have multiple named exports per file. Then import the specific exports they want surrounded in braces. The name of imported module has to be the same as the name of the exported module. Babel converts import and export declaration to CommonJS (require/module.exports) by default anyway. So even if you use ES6 module syntax, you will be using CommonJS under the hood if you run the code in Node.

Node.js module.exports vs. exports, What is the difference between Node's module.exports and ES6's export default ? I'm trying to figure out why I get the "__ is not a constructor" error when I try to  There are 4 types of exports: 1— Named exports (several per module) 2— Default exports (one per module) 3 — Mixed named & default exports 4— Cyclical Dependencies

Understanding module.exports and exports in Node.js, It is an empty object by default, and it is fine to change to anything. Exports Node.js internally wraps all require()-ed modules in a function wrapper: A variable named exports that is not being entirely exported is confusing,  The popularity of default module exports in CommonJS meant that JavaScript modules were designed to support this pattern: ES6 favors the single/default export style, and gives the sweetest syntax to importing the default. — David Herman June 19, 2014. So in JavaScript modules, you can export a default like this:

Comments
  • Don't we have a duplicate for this?
  • @Bergi: I didn't search tbh (shame on me :( ). There are certainly question about the same problem, but asked in a different way. Let me know if you find something that fits!
  • OK, it took some time to find these, but you may now use your newly acquired powers and choose one of How to correctly use ES6 "export default" with CommonJS "require"? and Can't require() default export value in Babel 6.x as a dupe target :-)
  • How ironic that I can do this now :D
  • @djKianoosh: See for yourself. After the assignment to module.exports, exports and module.exports have different values, so the assignment to exports.defaults has no effect (because module.exports is what gets exported). In other words, it's exactly the same as if you only did module.exports = { ... }.
  • This makes no sense. Every source that uses import declarations is a module, and those already are strict. The actual difference is about requiring vs importing.
  • What does make sense is using import instead of require and export default instead of exports.default.
  • stackoverflow.com/questions/31685262/…
  • This has to be the most downvoted answer I've ever seen on stackoverflow
  • @Jimi That's because it's the fourth-most-downvoted answer on the entire site.