React 18 - A Look Ahead

In this episode of Syntax, Scott and Wes talk about everything coming in React 18!

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Show Notes

04:32 - Automatic Batching

Don’t worry about re-renders

08:32 - New Render API

 const root = ReactDOM.createRoot(document.getElementById('root')); root.render();

No more hydrate method (yay!)

10:44 - Suspense

}>

Suspense is basically a promise resolver component - nothing inside will render until promise is resolved.
SuspenseList lets you coordinate the order in which loading indicators show up.

16:43 - StrictEffects Mode

https://github.com/reactwg/react-18/discussions/19
Will allow components to mount, unmount, and mount again
Will help with fastrefresh and really good dev experience

18:43 - useTransition() Hook

Not an animation hook. They named it this because of the future ability to add animations to React core.
Wrap the state update in a “transition” to prevent the ProfilePage from being unmounted while suspending. This lets React know that it should wait for the update to complete.
We classify state updates in two categories:
- Urgent updates reflect direct interaction, like typing, hover, dragging, etc.
- Transition updates transition the UI from one view to another.

23:11 - SSR Improvements

React.Lazy will work on the Server
Finally!
https://github.com/reactwg/react-18/discussions/37
Server-side rendering (abbreviated to “SSR” in this post) lets you generate HTML from React components on the server, and send that HTML to your users. SSR lets your users see the page’s content before your JavaScript bundle loads and runs.
React Server Components

34:45 - ELI5