How can I implement a lazy loading error boundary in React?

How can I implement a lazy loading error boundary in React?

You can use React's React.lazy for lazy loading components and wrap them in an ErrorBoundary to catch errors.

Can you show me a code example of that?

Sure! Here's a simple example:

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

const LazyComponent = lazy(() => import('./LazyComponent'));

class ErrorBoundary extends React.Component {
  constructor(props) {
    super(props);
    this.state = { hasError: false };
  }

  static getDerivedStateFromError(error) {
    return { hasError: true };
  }

  componentDidCatch(error, errorInfo) {
    console.error('Error caught in ErrorBoundary:', error, errorInfo);
  }

  render() {
    if (this.state.hasError) {
      return <h1>Something went wrong.</h1>;
    }
    return this.props.children;
  }
}

function App() {
  return (
    <Suspense fallback={<div>Loading...</div>}>
      <ErrorBoundary>
        <LazyComponent />
      </ErrorBoundary>
    </Suspense>
  );
}

What happens if the lazy component fails to load?

If the lazy component fails to load, the ErrorBoundary will catch the error and render the fallback UI you defined in the render method.