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?

First we convert our async data fetching functions into resources
Resources can then be read inside render - above the return
Resources can be read from cache
Resources can be preloaded into a cache if you anticipate needing them
Resources reads are blocking for that function - you can't return JSX until the resource is read
In your component that fetches data, there is no need to maintain a loading state
Then, anywhere higher up in that tree, you can introduce a suspense component
The suspense component can detect if any of it's children are currently loading data
If they are, we can then choose to show a loader via the fallback prop
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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