How to fix React.lazy promise did not resolve to a default component in React

// MyComponent.js
export default function MyComponent() {
  return <div>Hello</div>;
}

// MyComponent.js
export function MyComponent() {
  return <div>Hello</div>;
}

// MyComponent.js
export function MyComponent() {
  return <div>Hello</div>;
}
// No default export!

// MyComponentWrapper.js
export { MyComponent as default } from './MyComponent';

import { lazy, Suspense } from 'react';

const MyComponent = lazy(() => import('./MyComponentWrapper'));

export default function App() {
  return (
    <Suspense fallback={<div>Loading...</div>}>
      <MyComponent />
    </Suspense>
  );
}

import { lazy, Suspense } from 'react';

const MyComponent = lazy(() =>
  import('./MyComponent').then(module => ({
    default: module.MyComponent
  }))
);

export default function App() {
  return (
    <Suspense fallback={<div>Loading...</div>}>
      <MyComponent />
    </Suspense>
  );
}

const ComponentA = lazy(() =>
  import('./Components').then(m => ({ default: m.ComponentA }))
);

const ComponentB = lazy(() =>
  import('./Components').then(m => ({ default: m.ComponentB }))
);

// Button.js
export default function Button() {
  return <button>Click me</button>;
}

// Usage
const Button = lazy(() => import('./Button'));

// FormComponent.js
export default class FormComponent extends React.Component {
  render() {
    return <form>...</form>;
  }
}

// Usage
const FormComponent = lazy(() => import('./FormComponent'));

// BadComponent.js
export default {
  name: 'MyComponent',
  render: () => <div>Hello</div>
};

// This will fail—the default export must be a React component, not an object
const BadComponent = lazy(() => import('./BadComponent'));

const MyComponent = lazy(() => import('./components/MyComponent'));
const Other = lazy(() => import('@/components/Dialog'));  // With path aliases

const MyComponent = lazy(() => import('./NonExistentFile'));  // Path doesn't exist

// vite.config.js
import { defineConfig } from 'vite';
import react from '@vitejs/plugin-react';
import path from 'path';

export default defineConfig({
  plugins: [react()],
  resolve: {
    alias: {
      '@': path.resolve(__dirname, './src'),
    },
  },
});

// webpack.config.js
module.exports = {
  resolve: {
    alias: {
      '@': path.resolve(__dirname, 'src/'),
    },
  },
};

import { lazy, Suspense } from 'react';

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

export default function App() {
  return (
    <Suspense fallback={<div className="spinner">Loading component...</div>}>
      <HeavyComponent />
    </Suspense>
  );
}

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

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

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

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

  render() {
    if (this.state.hasError) {
      return <div>Failed to load component. Please refresh the page.</div>;
    }
    return this.props.children;
  }
}

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

const MyComponent = lazy(() =>
  import('./MyComponent').then(module => {
    console.log('Imported module:', module);
    console.log('Default export:', module.default);
    if (!module.default) {
      console.error('No default export found. Available exports:', Object.keys(module));
    }
    return module;
  })
);

// If you see named exports like MyComponent, use:
const MyComponent = lazy(() =>
  import('./MyComponent').then(m => ({ default: m.MyComponent }))
);

// If it's undefined, check the file path or export statement