Why And When To Use Default Export Over Named Exports In Es6 Modules

Why and when to use default export over named exports in es6 Modules?

Tags: javascript , es6-modules Answers: | Viewed 35,794 times



I have referred all the questions in stackoverflow.
But none of the suggested why and when to use default export.


I just saw that default can be metioned "When there is only one export in a file"


Any other reason for using default export in es6 modules?


Some Answers For Why And When To Use Default Export Over Named Exports In Es6 Modules

#1. Why and when to use default export over named exports …


import example from "./example";

import ex from "./example";

import { example } from "./example";

import { example as widgetExample } from "./widget/example";
import { example as gadgetExample } from "./gadget/example";

// imports // ex. importing a single named export import { MyComponent } from "./MyComponent";
// ex. importing multiple named exports import { MyComponent, MyComponent2 } from "./MyComponent";
// ex. giving a named import a different name by using "as": import { MyComponent2 as MyNewComponent } from "./MyComponent";
// exports from ./MyComponent.js file export const MyComponent = () =>
{} export const MyComponent2 = () =>
{}

import MyComponent as MainComponent from "./MyComponent";

import * as MainComponents from "./MyComponent";
// use MainComponents.MyComponent and MainComponents.MyComponent2 here

// import import MyDefaultComponent from "./MyDefaultExport";
// export const MyComponent = () =>
{} export default MyComponent;
import React, {Component} from 'react';
import { blue, red, green } from 'colors';

export foo;
//so that this can be used in other file import {foo} from 'abc';
//importing data/fun from module

export default foo;
//used in one file import foo from 'blah';
//importing data/fun from module

export = foo;
import * as foo from 'blah';

exports.foo = foo;
//1st method exports['default'] = foo;
//2nd method module.exports = foo;
//3rd method

var foo = require('abc').foo;
//1st method var foo = require('abc')['default'];
//2nd method var foo = require('abc');
//3rd method
//Named export , exporting:  export const xyz = () =>{ }  // while importing this import {xyx} from 'path' or const {xyz} = require(path)
//exporting default  const xyz =() >{ };
export default xyz //Importing import xyz from 'path' or const xyz = require(path)

#2. Named vs. Default Exports in ES6 Modules | Shane Mitchell's Blog

So that’s it, the differences between named and default exports in ES6 and how they are used. Key points: 1. Modules can have several named exports, but only one default export. 2. When importing, named exports must use the same name, while default exports can be imported to any name.


// foo.js  export const foo = () => {
console.log("foo"); } export const bar = 123;
// anotherComponent.js  // import the foo and bar named exports from foo.js import { foo, bar } from "./foo";  // both variables can now be used foo(); // logs 'foo' to the console console.log(bar); // logs the number 123 to the console
import { foo as myVariable, bar } from "./foo";  myVariable(); // logs 'foo' to the console
// baz.js  const baz = () => {
console.log("baz"); } export default baz;
// anotherComponent.js  // import the default export from baz.js import bazDefault from "./baz";  // the imported variable can now be used bazDefault(); // logs 'baz' to the console

#3. Why and when to use default export over named exports in es6 …

Some differences that might make you choose one over the other: Named Exports. Can export multiple values; MUST use the exported name when importing; Default Exports. Export a …


import example from "./example";

import ex from "./example";

import { example } from "./example";

import { example as widgetExample } from "./widget/example";
import { example as gadgetExample } from "./gadget/example";

// imports // ex. importing a single named export import { MyComponent } from "./MyComponent";
// ex. importing multiple named exports import { MyComponent, MyComponent2 } from "./MyComponent";
// ex. giving a named import a different name by using "as": import { MyComponent2 as MyNewComponent } from "./MyComponent";
// exports from ./MyComponent.js file export const MyComponent = () =>
{} export const MyComponent2 = () =>
{}

import MyComponent as MainComponent from "./MyComponent";

import * as MainComponents from "./MyComponent";
// use MainComponents.MyComponent and MainComponents.MyComponent2 here

// import import MyDefaultComponent from "./MyDefaultExport";
// export const MyComponent = () =>
{} export default MyComponent;
import React, {Component} from 'react';
import { blue, red, green } from 'colors';

export foo;
//so that this can be used in other file import {foo} from 'abc';
//importing data/fun from module

export default foo;
//used in one file import foo from 'blah';
//importing data/fun from module

export = foo;
import * as foo from 'blah';

exports.foo = foo;
//1st method exports['default'] = foo;
//2nd method module.exports = foo;
//3rd method

var foo = require('abc').foo;
//1st method var foo = require('abc')['default'];
//2nd method var foo = require('abc');
//3rd method
//Named export , exporting:  export const xyz = () =>{ }  // while importing this import {xyx} from 'path'
or const {xyz} = require(path)
//exporting default  const xyz =() >{ };
export default xyz //Importing import xyz from 'path'
or const xyz = require(path)

#4. [Solved] Why and when to use default export over named

7/5/2022  · MUST use the exported name when importing; Default Exports. Export a single value; Can use any name when importing; This article does a nice job of explaining when it …


import foo from "./foo";

import getFoo from "./foo";

import { foo } from "./foo";

// imports // ex. importing a single named export import { MyComponent } from "./MyComponent";
// ex. importing multiple named exports import { MyComponent, MyComponent2 } from "./MyComponent";
// ex. giving a named import a different name by using "as": import { MyComponent2 as MyNewComponent } from "./MyComponent";
// exports from ./MyComponent.js file export const MyComponent = () =>
{} export const MyComponent2 = () =>
{}

import MyComponent as MainComponent from "./MyComponent";

import * as MainComponents from "./MyComponent";
// use MainComponents.MyComponent and MainComponents.MyComponent2 here

// import import MyDefaultComponent from "./MyDefaultExport";
// export const MyComponent = () =>
{} export default MyComponent;
import React, {Component} from 'react';
import { blue, red, green } from 'colors';

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

expecting that bar is assigned the value of the default export. But as we can see in the example above, the default export is assigned to the default property! So in order to access the …


'use strict' class SlimShady {
constructor(options) {
this._options = options
}
sayName() {
return 'My name is Slim Shady.'
} } // This works module.exports = SlimShady

'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

// input export const foo = 42;
export default 21;
// output "use strict";
Object.defineProperty(exports, "__esModule", {
value: true });
var foo = exports.foo = 42;
exports.default = 21;

var bar = require('./input');
new bar();

var bar = require('./input').default;

import bar from './input';
console.log(bar);

'use strict';
var _input = require('./input');
var _input2 = _interopRequireDefault(_input);
function _interopRequireDefault(obj) { return obj &&
obj.__esModule ? obj : { default: obj };
} console.log(_input2.default);
module.exports = new DAO() module.exports.initDAO = initDAO // append other functions as named export  // now you have let DAO = require('_/helpers/DAO');
// DAO by default is exported class or function DAO.initDAO()

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

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

#6. Named Export vs Default Export in ES6 | by Alankar …

Mar 17, 2018  · Named Export vs Default Export in ES6. ES6 provides us to import a module and use it in other files. Strictly speaking in React terms, one can use stateless components in …


// imports
// ex. importing a single named export
import { MyComponent } from "./MyComponent";
// ex. importing multiple named exports
import { MyComponent, MyComponent2 } from "./MyComponent";
// ex. giving a named import a different name by using "as":
import { MyComponent2 as MyNewComponent } from "./MyComponent";
// exports from ./MyComponent.js file
export const MyComponent = () =>
{}
export const MyComponent2 = () =>
{}
import * as MainComponents from "./MyComponent";
// use MainComponents.MyComponent and MainComponents.MyComponent2
here
// importimport MyDefaultComponent from "./MyDefaultExport";// exportconst MyComponent = () =>
{}
export default MyComponent;

#7. Module Exports vs. Export Default: Why Not Both? - Big Nerd Ra…

Simplify usage: Having a default export simplifies import when the person importing the module just wants the obvious thing from there. There’s simply less syntax and typing to do.Signal intent: A default export communicates the module author’s understanding about what the primary export is from their module.


export const A = 'A'  export default A
const A = 'A'  module.exports = {
A,
default: A, }
export const find = async (options) =>
{ /* … */ } export const delete = async (id) =>
{ /* … */ } export default {
find,
delete,
import customer from './resources/customer'  import product from  './resources/product'  export const productsForCustomer = async (customerId) =>
{
const buyer = await customer.find(customerId)
const products = await Promise.all(
buyer.orders
.map { order =>
order.productIds }
.map { productId =>
product.find(productId) }
)
return products }
import { find as findCustomer } from './resources/customer'  import { find as findProduct } from  './resources/product'  export const productsForCustomer = async (customerId) =>
{
const buyer = await findCustomer(customerId)
const products = await Promise.all(
buyer.orders
.map { order =>
order.productIds }
.map { productId =>
findProduct(productId) }
)
return products }

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