How to properly lazy load components in react.js when using auth0?

@herminia_bruen 

To properly lazy load components in React.js when using Auth0 for authentication, you can follow these steps:

1. Install the necessary dependencies: If you haven't already, install the react-router-dom package which will be used for lazy loading components. You can install it using npm or yarn by running the following command:

1

npm install react-router-dom

or

1

yarn add react-router-dom

1. Create a higher-order component for lazy loading: You can create a higher-order component that will dynamically import your component using React.lazy and React.Suspense. Here is an example of how you can accomplish this:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16

import React, { lazy, Suspense } from 'react';

const LazyComponent = importComponent =>
  lazy(() => importComponent);

const SuspenseComponent = importComponent => {
  const Component = LazyComponent(importComponent);

  return props => (
    <Suspense fallback={<div>Loading...</div>}>
      <Component {...props} />
    </Suspense>
  );
};

export default SuspenseComponent;

1. Use the lazy loading component with Auth0: Wherever you want to lazy load a component, you can use the SuspenseComponent created in the previous step and pass in the path to your component. For example:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20

import SuspenseComponent from './SuspenseComponent';
import { useAuth0 } from '@auth0/auth0-react';

const Home = SuspenseComponent(() => import('./Home'));

const App = () => {
  const { isAuthenticated, isLoading } = useAuth0();

  if (isLoading) {
    return <div>Loading...</div>;
  }

  return (
    <div>
      {isAuthenticated ? <Home /> : <Login />}
    </div>
  );
};

export default App;

With these steps, you can properly lazy load components in React.js while using Auth0 for authentication. This approach helps improve the performance of your application by only loading the components when they are actually needed.