How to integrate React Query with React Suspense, and what are the considerations?

React Query supports integration with React Suspense, making data fetching as natural as handling component rendering:

Basic Integration Method

1. Enable Suspense mode:

   javascript
   const { data } = useQuery('todos', fetchTodos, {
     suspense: true,
   });

2. Wrap with Suspense component:

   javascript
   function TodoList() {
     const { data: todos } = useQuery('todos', fetchTodos, {
       suspense: true,
     });
     
     return (
       <ul>
         {todos.map(todo => (
           <li key={todo.id}>{todo.title}</li>
         ))}
       </ul>
     );
   }
   
   function App() {
     return (
       <Suspense fallback={<div>Loading...</div>}>
         <TodoList />
       </Suspense>
     );
   }

Error Boundary Handling

When using Suspense mode, errors need to be caught through Error Boundary:

javascript
class ErrorBoundary extends React.Component {
  constructor(props) {
    super(props);
    this.state = { hasError: false, error: null };
  }
  
  static getDerivedStateFromError(error) {
    return { hasError: true, error };
  }
  
  render() {
    if (this.state.hasError) {
      return <div>Error: {this.state.error.message}</div>;
    }
    return this.props.children;
  }
}

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

Considerations

1. Compatibility:

   • Suspense mode requires React 16.6+
   • Ensure all related components support Suspense

2. Error Handling:

   • Must use Error Boundary to catch errors
   • Can no longer use error and isError properties returned by useQuery

3. Cache Behavior:

   • Even if data is in cache, Suspense is still triggered on first render
   • Subsequent renders will directly use cached data without triggering Suspense

4. Performance Considerations:

   • Suspense mode may cause multiple renders of the component tree
   • For complex applications, need to balance user experience and performance

5. Compatibility with Other Features:

   • Window focus refetching: May cause unexpected Suspense triggers
   • Polling: Need to be carefully configured to avoid frequent Suspense triggers

6. Server-Side Rendering:

   • Using Suspense in SSR environment requires special handling
   • Recommended to use dehydrate and hydrate methods

Best Practices

1. Progressive Adoption:

   • Try Suspense mode in non-critical components first
   • Gradually expand to the entire application

2. Reasonable Use of Fallback:

   • Provide meaningful loading states
   • Avoid using overly simple loading indicators

3. Combine with Prefetching:

   • Use queryClient.prefetchQuery to get data in advance
   • Reduce the number of Suspense triggers

4. Error Boundary Strategy:

   • Place Error Boundary at appropriate levels
   • Provide specific error messages and recovery options

By properly integrating React Query and Suspense, you can create more fluid, responsive user interfaces while maintaining code simplicity and readability.