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

If you want to know what's happening with your errors, track them with Sentry. Sentry is open-source error tracking that helps developers monitor and fix crashes in real time. Cut your time on error resolution from five hours to five minutes. It works with any language and integrates with dozens of other services. Syntax listeners can get two months for free by visiting Sentry.io and using the coupon code "tastytreat".

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

Tweet us your tasty treats!

Scott's Instagram
LevelUpTutorials Instagram
Wes' Instagram
Wes' Twitter
Wes' Facebook
Scott's Twitter
Make sure to include @SyntaxFM in your tweets