The useDeferredValue hook requires React 18+ with concurrent features enabled. This error occurs when trying to use useDeferredValue in React builds that don't include concurrent rendering capabilities, such as older React versions, production builds with concurrent features disabled, or development builds without experimental flags.
The error "useDeferredValue is not available in this React build" indicates that you're trying to use the useDeferredValue hook in a React environment that doesn't support concurrent features. useDeferredValue is part of React's concurrent rendering API introduced in React 18, which allows React to work on multiple state updates simultaneously and prioritize urgent updates over non-urgent ones. Unlike the simpler error about React version mismatch, this specific message suggests that while you might have React 18 installed, the particular build configuration you're using doesn't include the concurrent features necessary for useDeferredValue to function. This can happen in several scenarios: 1. **Production builds with concurrent features disabled**: Some build tools or configurations might exclude concurrent features to reduce bundle size or for compatibility reasons. 2. **Development builds without experimental flags**: In some setups, concurrent features need to be explicitly enabled via flags or configuration. 3. **Custom React builds**: If you're using a custom React build or a fork, it might not include all concurrent features. 4. **Server-side rendering configurations**: Some SSR setups might use different React builds that don't include concurrent features. The hook useDeferredValue specifically helps with performance optimization by allowing you to defer updating less important parts of the UI while keeping urgent updates responsive. Without concurrent rendering capabilities, this hook cannot function.
First, confirm you have React 18+ installed and that it includes concurrent features:
npm list react react-domLook for version 18.0.0 or higher. If you see version 17.x or earlier, you need to upgrade:
npm install react@18 react-dom@18Examine your build configuration files (webpack.config.js, vite.config.js, etc.) for any settings that might disable concurrent features. Look for:
- Webpack: Check for process.env.NODE_ENV === 'production' conditions that might exclude features
- Vite: Check build configuration and any React-specific plugins
- Create React App: Verify you're using react-scripts 5.0.0+ which supports React 18
Also check if you have any custom Babel or SWC configurations that might be stripping React features.
React 18 concurrent features only work with the new createRoot API. Update your application entry point:
Before (legacy API - no concurrent features):
import ReactDOM from 'react-dom';
import App from './App';
ReactDOM.render(<App />, document.getElementById('root'));After (concurrent features enabled):
import { createRoot } from 'react-dom/client';
import App from './App';
const root = createRoot(document.getElementById('root'));
root.render(<App />);Without createRoot, your app runs in "legacy mode" and concurrent features like useDeferredValue won't be available.
If you're using React from a CDN or have a custom build setup, ensure it includes concurrent features:
CDN usage (make sure to use React 18+):
<!-- Correct: React 18 with concurrent features -->
<script crossorigin src="https://unpkg.com/react@18/umd/react.development.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
<!-- Incorrect: React 17 without concurrent features -->
<script crossorigin src="https://unpkg.com/react@17/umd/react.development.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>If you have a custom build process for React, ensure you're building with concurrent features enabled.
Create a minimal test case to isolate the issue:
1. Create a new file TestDeferredValue.jsx:
import { useDeferredValue, useState } from 'react';
export default function TestDeferredValue() {
const [value, setValue] = useState('');
const deferredValue = useDeferredValue(value);
return (
<div>
<input
value={value}
onChange={(e) => setValue(e.target.value)}
placeholder="Type to test useDeferredValue"
/>
<p>Deferred: {deferredValue}</p>
</div>
);
}2. Import and render this component in your app.
3. If it works, the issue is elsewhere in your configuration. If it fails, you have a React build issue.
Sometimes build caches can cause issues. Clear them and reinstall:
# Clear npm/yarn caches
npm cache clean --force
# or
yarn cache clean
# Remove node_modules and lock files
rm -rf node_modules package-lock.json
# Reinstall
npm install
# Clear build tool caches
# For Webpack:
rm -rf .webpack-cache
# For Vite:
rm -rf node_modules/.viteThen rebuild your application.
Understanding React build variants: React has different build variants:
- development: Includes warnings, dev tools, and concurrent features
- production: Optimized for performance, may exclude some dev-only features
- profiling: Includes performance measurement tools
- node: For server-side rendering
Ensure you're using the correct variant for your use case. Concurrent features should be available in both development and production builds of React 18.
Build tool specific configurations:
Webpack: If using Webpack, check for:
// In webpack.config.js
plugins: [
new webpack.DefinePlugin({
'__DEV__': process.env.NODE_ENV !== 'production',
// Ensure React can detect concurrent features
'process.env.REACT_CONCURRENT_FEATURES': JSON.stringify('true')
})
]Vite: In vite.config.js:
export default defineConfig({
define: {
'process.env.REACT_CONCURRENT_FEATURES': '"true"'
}
})Monorepo considerations: In monorepos, ensure all packages use the same React version and build configuration. Use "resolutions" in package.json to enforce consistency.
Server Components and Next.js: If using Next.js with React Server Components, ensure your Next.js version supports React 18 concurrent features (Next.js 13+). Some features might be disabled in certain rendering modes.
Testing environment: If the error occurs only in tests, check your test runner configuration. Jest might need additional configuration to support React 18 concurrent features.
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