How to fix Failed to load source map from suspense chunk in React

First, confirm that your application is working correctly despite the warning. Open your browser console and check:

Failed to load source map from suspense chunk

If your React application renders properly and all features work, this is a development-only warning that doesn't affect functionality. Source maps are only used by DevTools for debugging - they don't impact production builds or runtime behavior.

Stop your development server and clear the Vite cache to force a fresh pre-bundling process:

# Stop the dev server (Ctrl+C)

# Remove Vite cache
rm -rf node_modules/.vite

# Restart development server
npm run dev
# or
yarn dev

This ensures all dependencies are pre-bundled fresh and source maps are generated in the correct order. Wait for pre-bundling to complete before making any browser requests.

Adjust your Vite configuration to control source map generation during development:

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

export default defineConfig({
  plugins: [react()],
  build: {
    sourcemap: true
  },
  css: {
    devSourcemap: true
  },
  // Optimize dependency pre-bundling
  optimizeDeps: {
    include: ['react', 'react-dom']
  }
});

The optimizeDeps.include option ensures critical dependencies are pre-bundled immediately, reducing race conditions.

If the warnings are distracting during development, you can temporarily disable source map loading in Chrome DevTools:

1. Open Chrome DevTools (F12)
2. Click the three dots menu (⋮) in the top-right
3. Select Settings
4. Under Sources, uncheck "Enable JavaScript source maps"

Note: This only hides the warning - it doesn't fix the underlying issue. You'll lose source map debugging capabilities while this is disabled.

If you're using multiple Vite plugins, their order can affect source map generation. Try reordering plugins in your vite.config.ts:

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

export default defineConfig({
  plugins: [
    // Place React plugin first
    react(),
    // Other plugins after
    svgr()
  ]
});

Some plugins modify source map generation, so placing the React plugin first ensures it has priority.

Wrap your Suspense boundaries with error boundaries to handle loading failures gracefully:

import { Suspense, lazy } from 'react';
import { ErrorBoundary } from 'react-error-boundary';

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

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

This ensures your app handles chunk loading failures properly, even if source maps are unavailable.