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Hasty Treat - React Suspense

Published: March 18, 2019, 1 p.m.

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In this Hasty Treat, Scott and Wes talk about React Suspense \\u2014 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\\xa0resources
  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\\u2019t 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\\xa0detect\\xa0if any of it\\u2019s children are currently loading data
  9. If they are, we can then choose to show a loader via the\\xa0fallback\\xa0prop
  10. We can also choose to\\xa0show nothing via the maxDelay prop\\xa0\\u2014 this is helpful for fast connections that shouldn\\u2019t 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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