How to fix useDeferredValue is not available in this React build in React

What this error means

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.

Typical symptoms

• Runtime error: "useDeferredValue is not available in this React build"
• Application crashes when component using useDeferredValue renders
• Hook works in development but fails in production build
• Error occurs only in certain build configurations (production vs development)
• useDeferredValue works locally but fails in CI/CD pipeline or deployed environment

Common causes

1. React concurrent features disabled in production build configuration
2. Using a custom or forked React build without concurrent features
3. Build tool (Webpack, Vite, etc.) configured to exclude concurrent features
4. React version is 18+ but concurrent features were explicitly disabled
5. Server-side rendering using a different React build than client-side
6. Experimental React features not enabled in development
7. Using React from a CDN that doesn't include concurrent features

How to fix "useDeferredValue is not available in this React build"

npm list react react-dom

npm install react@18 react-dom@18

import ReactDOM from 'react-dom';
import App from './App';

ReactDOM.render(<App />, document.getElementById('root'));

import { createRoot } from 'react-dom/client';
import App from './App';

const root = createRoot(document.getElementById('root'));
root.render(<App />);

<!-- 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>

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>
  );
}

# 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/.vite

Advanced notes

// 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')
  })
]

export default defineConfig({
  define: {
    'process.env.REACT_CONCURRENT_FEATURES': '"true"'
  }
})

Frequently asked questions

What does "useDeferredValue is not available in this React build" mean?

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.

How do I fix "useDeferredValue is not available in this React build"?

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.

What causes "useDeferredValue is not available in this React build"?

React concurrent features disabled in production build configuration Using a custom or forked React build without concurrent features Build tool (Webpack, Vite, etc.) configured to exclude concurrent features

Is the "useDeferredValue is not available in this React build" error serious?

It is a medium-severity error — more of a blocker than a risk. The steps above resolve it.

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Official resources & further reading

• 📚React Official Documentation