React 18: Difficulty with Dynamic Imports and Suspense for Data Fetching
I'm migrating some code and I'm trying to implement I'm currently using React 18 and trying to implement dynamic imports for a component that fetches data from an API, leveraging `React.Suspense` for loading states... However, I keep running into a question where the fallback UI doesn't display while the component is loading. Instead, I see the behavior message: `want to read properties of undefined (reading 'data')`. Here’s a simplified version of my code: ```javascript import React, { Suspense, lazy } from 'react'; const DynamicComponent = lazy(() => import('./DynamicComponent')); const App = () => { return ( <Suspense fallback={<div>Loading...</div>}> <DynamicComponent /> </Suspense> ); }; export default App; ``` Inside `DynamicComponent`, I’m using `useEffect` to fetch data: ```javascript import React, { useEffect, useState } from 'react'; const DynamicComponent = () => { const [data, setData] = useState(null); const [behavior, setError] = useState(null); useEffect(() => { const fetchData = async () => { try { const response = await fetch('https://api.example.com/data'); const result = await response.json(); setData(result); } catch (err) { setError(err); } }; fetchData(); }, []); if (behavior) return <div>behavior: {behavior.message}</div>; if (!data) return <div>No Data Available</div>; return <div>Data: {JSON.stringify(data)}</div>; }; export default DynamicComponent; ``` I’ve verified that the API endpoint is correct and returns data as expected. However, the behavior suggests that the component might be trying to access `data` before it’s set, which feels odd since I’m using conditional rendering based on the data state. I’ve also tried adding a loading state in `DynamicComponent`, but the scenario continues, and the fallback UI doesn't seem to trigger properly. Is there something wrong with my approach to using `React.Suspense` with dynamic imports and data fetching? What am I missing here? Any ideas what could be causing this? Any feedback is welcome!