"domContainerNode is not defined." How do I fix this?

echizenyayota
Tourist
9 1 0

Hi, everyone!
I want to show the button which displays "Button clicked!" on the screen using my index.js below.

 

 

import {AppProvider, Button} from '@shopify/polaris';
import React from 'react';
import ReactDOM from 'react-dom';

const app = (
<Button onClick={() => alert('Button clicked!')}>Example button</Button>
);

ReactDOM.render(app, domContainerNode);

export default app;

 

 

 

But then, the screen shows me "domContainerNode is not defined."

1.png

How do I fix the above to display the button?
In addition, I have already published the other files to display the button on GitHub.




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