In this Hasty Treat, Scott and Wes talk about React Suspense — what it is, how it works, support and more!

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Show Notes

Not live yet - it may/will change. Be warned!

3:59 - The problem we have with React right now

• API calls
• Image loading
• Code splitting

7:16 - What is React Suspense?

1. First we convert our async data fetching functions into resources
2. Resources can then be read inside render - above the return
3. Resources can be read from cache
4. Resources can be preloaded into a cache if you anticipate needing them
5. Resources reads are blocking for that function - you can’t return JSX until the resource is read
6. In your component that fetches data, there is no need to maintain a loading state
7. Then, anywhere higher up in that tree, you can introduce a suspense component
8. The suspense component can detect if any of it’s children are currently loading data
9. If they are, we can then choose to show a loader via the fallback prop
10. We can also choose to show nothing via the maxDelay prop — this is helpful for fast connections that shouldn’t see the spinner for a short split-second

15:20 - Support

• React.lazy and suspense for code splitting is already here
• The React.lazy function lets you render a dynamic import as a regular component
• Loadable Components is recommended if you need splitting with SSR
• Data Resources is not here yet

Links

• React 16.x Roadmap

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