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March 18th, 2019 ×

Hasty Treat - React Suspense

Wes Bos

Wes Bos Host

Scott Tolinski

Scott Tolinski Host

or
Show Notes Transcript

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

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