Why does my React Component Export not work?

I was just getting into react and trying it out for myself. After hours of configuring webpack just to get a hello world on my screen I thought I could get going now but after trying to render another component from a file the next problem.

My main file is app.js, which renders everything:

import React from 'react'; import ReactDOM from 'react-dom'; import {Hello} from './hello'; ReactDOM.render( <Hello/>, document.getElementById('app') ); 

The Hello component comes from my hello.js in the same folder:

import React from 'react'; class Hello extends React.Component{ render(){ return ( <h1>Hello, world!</h1> ) } } export default Hello; 

It was rendering fine when I was doing everything just in app.js without the import/export. It also compiles fine. But there are a lot of errors now in the console. So what am I missing?

Thanks

Gerd

2 Answers

Because your export is default you don't need braces around your import component name:

import Hello from './hello'; 

Here's a verbose technical article from Axel Rauschmayer on the final ES6 modules syntax that you might find useful.

And here's a slightly less techy post about the same topic.

when you import the default class you use

import ClassName from 'something'; 

and when you import other classes you use

import {ClassName} from 'something'; 

an example:

in hello.js file

import React from 'react'; class Hello extends React.Component{ render(){ return ( <h1>Hello, world!</h1> ) } } class Other extends React.Component{ render(){ return ( <h1>Hello, world!</h1> ) } } export default Hello; export Other; 

in other file

import Hello, {Other} from './hello'; 

tip: you could also import the default class with other name

import Component, {Other} from './hello';