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ES6 Nested Imports (Babel + React)

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ES6 Nested Imports (Babel + React)

Here's a quick tip on using the proper module imports in JavaScript ES6 for Babel and ReactJS

· Web Dev Zone ·
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Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

With the ES 6 module system, you have a choice of whether to use a single default export:

 export default DefaultObject 



... or potentially many named exports:

 export const NondefaultObject = {} 



You import these slightly differently, but otherwise, they work the same:

import DefaultObject from './DefaultObject'
import {NondefaultObject} from './NondefaultObject'

const App = () => (
  <div>
    <DefaultObject/> 
    <NondefaultObject />
   </div>
)



Where things go awry is when you want to aggregate imports, as per Jack Hsu’s excellent article on Redux application structure.

import * as do from './DefaultObject'
import * as ndo from './NondefaultObject'

const App = () => (
  <div>
    <do.DefaultObject/>       // Does NOT work
    <ndo.NondefaultObject />  // works
    <do.default>              // works
   </div>
)



Why is it so? When you import a default export, the name of the object is actually “default”. Somewhere in the Babel/Redux/React magic factory, somebody is clever enough to use the module name as an alias for its own default export when you use that module name in a JSX tag. However, when you assign that same default export to another value and then try to use that value (as in the import * case), no such magic occurs.

Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

Topics:
es-6 ,javascript ,front-end ,web development ,react js

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