r/reactjs • u/gaearon React core team • Sep 10 '26

News React 19.3

https://react.dev/blog/2026/09/09/react-19-3
168 Upvotes

98% Upvoted

21 comments sorted by

45

u/repeating_bears Sep 11 '26

Lots of release notes and they don't even mention that the devtools that have been broken for 2 years is finally fixed 

Thank christ

2

u/adzm Sep 11 '26

Oh really

7

u/repeating_bears Sep 11 '26

It would show things re-rendering even though they didn't. Massive waste of time when you're debugging performance and the devtools flat out lie to you

It was fixed about 6 months ago I think because I was following the ticket. I've been waiting for a release since then

35

u/switz213 Sep 11 '26

Glad to see all of this exit canary. Great features that all deserve their place.

I'm especially excited about use(browser()) - love the idea of "suspending" the environment.

Haven't seen much discussion about rendering ContextProviders in a server component, but I was always puzzled why that wasn't supported from the get-go. Great dx sugar, feels like a no brainer.

Nice work!

8

u/azsqueeze Sep 11 '26

Context not being able to render on the server was the strangest thing for me. Like its just some data sitting in memory. It even has an initial value that you have to define. Why couldnt they render the context with the initial value and rehydrate in the browser. Literally they do this with everything else.

Either way, glad they updated.

-9

u/Inatimate Sep 11 '26

i can’t wait for use(using(useBrowser()))

5

u/Glad-Action9541 Sep 11 '26

react-dom bundle size grew a lot
react-dom-client.production.js raw: 523.5 kB → 610.5 kB (+87 kB).

2

u/rafark 21d ago

Why are we still counting kilobytes in 2026? Why are 80 kilobytes a problem? 

1

u/nicereddy Sep 11 '26

Any specific reason why? 🤔

3

u/Alert_Sweet_8244 Sep 11 '26

use(browser()) thing is excellent.

6

u/iamxo69 Sep 11 '26

That use browser api seems super useful. Will get rid of loads of boilerplate!

2

u/rodrigocfd Sep 11 '26

I don't now about you guys, but I'm having A LOT of fun with the view transitions right now.

19

u/EuMusicalPilot I ❤️ hooks! 😈 Sep 11 '26

Tell it to webkit browsers. Crashing and leaking ram like a radioactive isotope

1

u/vazark Sep 14 '26

That few releases increasingly feel like walking in loops. Between view transitions and other recent css features being baselines (dialog, custom select etc) .. I’m thinking of going back to the basics and just use classic server rendering :|

-4

u/fii0 Sep 11 '26

If Dark Reader completely breaks your page, a super popular extension, maybe that's a hint that you're going in the wrong direction...

2

u/breadist Sep 11 '26

I'm also using dark reader and don't have any issues with the page.

1

u/fii0 Sep 11 '26

The error shows up with Dark Reader enabled, if I disable it and refresh, it's totally fine - tested on both Firefox and Chrome!

-35

u/[deleted] Sep 10 '26

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