Running App.js (for custom dash components)

Dash Python
1

Hello, for a more complicated dash component, I would like to run the src/demo/App.js file to debug the component. (I am fairly new to react).

When I run nodemon App.js, it creates the error

import React, {Component} from 'react';
^^^^^^

SyntaxError: Cannot use import statement outside a module

How can I run App.js on a local server and use the component in the component folder?